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Review

Białowieża Forest—A Relic of the High Naturalness of European Forests

by
Bogdan Jaroszewicz
1,
Olga Cholewińska
1,*,
Jerzy M. Gutowski
2,
Tomasz Samojlik
3,
Marcelina Zimny
4 and
Małgorzata Latałowa
4
1
Białowieża Geobotanical Station, Faculty of Biology, University of Warsaw, Sportowa 19, 17-230 Białowieża, Poland
2
Forest Research Institute, Department of Natural Forests, Park Dyrekcyjny 6, 17-230 Białowieża, Poland
3
Mammal Research Institute, Polish Academy of Sciences, Stoczek 1, 17-230 Białowieża, Poland
4
Laboratory of Palaeoecology and Archaeoboatny, Department of Plant Ecology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland
*
Author to whom correspondence should be addressed.
Forests 2019, 10(10), 849; https://doi.org/10.3390/f10100849
Submission received: 14 August 2019 / Revised: 25 September 2019 / Accepted: 27 September 2019 / Published: 29 September 2019
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Abstract

:
In Europe only some small isolated patches of forests with a high degree of naturalness still exist. These are forests, whose structure, composition and function has been shaped by natural dynamics without substantial anthropogenic influence over the long period. In this respect, Białowieża Forest is a unique location in Europe, with continuous forest cover for close to 12,000 years. The palynological, archaeological and historical data document only a weak anthropogenic fingerprint compared to other European lowland forests in Holocene history. Due to long-lasting protection, a large portion of the forest is still composed of stands originating from the pre-silvicultural period. Moreover, the stands of Białowieża Forest converted by silvicultural activities during the 20th century have the potential to recover owing to patches of stands with high naturalness, scattered throughout the forest. As conflict over management of the forest has recurred regularly for close to century, there is a need to summarize our knowledge on the forest history and natural assets, to help making scientifically informed decisions over its future. Expansion of a non-intervention approach to the Polish part of the forest is suggested to increase the stability of the entire ecosystem and enhance the chances for its successful adaptation to changing environmental conditions. This will increase the importance of Białowieża Forest as an open-door laboratory for biology, ecology, and forestry.

1. Introduction

We live in an era of globally accelerating loss of forests [1,2,3], which are essential ecosystems for life on Earth and for human well-being. Forests cover only one third of the land surface but contain 80% of the terrestrial plant biomass and provide habitat for over half of terrestrial biodiversity [4]. They sustain human well-being by delivering many ecosystem services [5,6,7]. For millennia forests were, and still are, of paramount importance for humankind and priority is still given to provisioning services, especially timber production, which causes loss of tree biomass and shrinking of forest cover in all wooded biomes [3]. Conversion of forests into other forms of land cover started thousands of years ago and during the past 5000 years global forest area has decreased by approximately 1.8 billion hectares, i.e., close to 50% of the area covered by forests today [8,9]. Since at least the late 1700s, the vast majority of remaining European forests has been systematically changed by silvicultural practices [10]. In effect, only some small isolated patches of forests with a high degree of naturalness still exist in Europe, mainly in the least accessible and low populated mountain and boreal zones [11]. These are forests, whose structure, composition and function has been shaped by natural dynamics without substantial anthropogenic influence over the long period.
One of the very few lowland forest complexes on the European Plain, where substantial fragments of close-to-primeval forest have survived until our times, is Białowieża Forest (BF) [11]. Due to unique degree of naturalness, this forest is used as a benchmark by conservation science and modern forestry, and plays a role of a living laboratory for ecological, forestry and evolutionary sciences. Its importance to science is well reflected in high number of scientific articles mentioning the BF. At the end of June 2019 a search executed in the core collection of the Web of Science, with the keyword ‘Bialowie*’ as a topic, returned 1087 articles (93 in 2018) which resulted in 20,697 citations (2309 in 2018). A large portion of these publications concentrate on interactions between components of the forest ecosystem, increasing our understanding of the “web of life”. This web of connections cannot be studied in human-designed intensively managed forests because their functioning has been changed by depleted species composition [12,13], impoverished interactions [14,15] and reduced amounts and diversity of substrates and microhabitats typical to natural forests [16,17]. Despite international recognition of the outstanding value of the BF [11,18], the year 2015 brought a relapse of the conflict over its management, ignited by an outbreak of European spruce bark beetle (Ips typographus L.) [19,20]. This conflict is not only an environmental one, but involves high political stakes on the country level [21]. To justify salvage logging of old-growths, politicians and decision makers involved into the conflict launched a disinformation campaign in the media, denying the uniqueness and natural character of the BF and stressing its cultural history and anthropogenic transformation instead [22,23]. The conflict became a global scientific issue and was listed by Nature as one of the most important science events globally that shaped the year 2017 [24].
Therefore, the aim of this paper is to summarize the multidisciplinary scientific evidence of the high natural value of the BF, which is not in opposition to the fact that the recent shape of this forest is indeed an effect of the long-lasting interplay between nature and its traditional extensive use. Specifically we want to: (1) Report the unique values of that last remnant of temperate close-to-natural forest; (2) outline the ecological and anthropogenic processes that shaped BF and allowed preservation of its high naturalness till the 21st century; (3) outline the century-long conflict over its management; (4) suggest some potential solutions in the field of its conservation.

2. Methods

We reviewed the published sources focusing on the environmental history, archeology, biodiversity, conservation status of the Białowieża Forest and conflicts over its management, which were used as a broad inclusion criteria. Our research questions were very broad and divergent, which made a classical systematic review approach not suitable, especially when some original palynological, faunistic and floristic data were included into the text, to close some minor knowledge gaps revealed during writing. In effect, our article is kind of a scoping review [25], expanded by the original data from the ongoing unpublished research. We used two different approaches to collate the evidence across this wide range of topics. In the fields of palaeoecology and environmental history, due to limited amount of papers considering BF, all articles in the field, from indexed and non-indexed sources were considered and their importance to the topic was assessed. In other fields of this review (ecology, biodiversity, nature conservation) the relevant literature was identified by searching the Web of Science (WoS) [26], using the key ‘Bialowie*’ as a topic, which returned 1087 articles (in 2019). In the next step we excluded categories of articles, which were: (1) Irrelevant to the scope of our review (e.g., mathematics applied, chemistry applied, immunology, ethics, tropical medicine, nutrition dietetics, agronomy, urban studies, veterinary studies, microbiology, etc.); (2) too broad or containing just case studies, species descriptions, etc. (e.g., zoology, ornithology, plant sciences, entomology, etc.). This filtering returned 440 articles, which importance to our review was assessed against the inclusion criteria based first on titles, thereafter the abstracts and finally, the full-text. Each author carried own assessment, according to the field of expertise. We also examined published bibliographies of BF [27,28,29,30,31,32,33,34,35,36], to identify sources not indexed in WoS and made a national (Polish) grey literature scanning for the last 4 years, for which a bibliography was not available. We used our expert knowledge on Białowieża Forest, gathered during scientific studies, to assess the importance of each publication against the inclusion criteria. We preferred in our review those papers or books, which summarized the knowledge in the field, over the papers concentrating on narrower subjects, single in-depth case studies, etc. In effect, we included 140 articles, books or website sources into the review: 42 Polish-language and 98 foreign language (English, Russian, Belarusian, German). Half of the sources (63 articles) were papers from the journals indexed in the WoS, while 33 articles were not listed. We cited also 38 books and 6 other sources (websites or manuscripts). Finally, the 61 articles selected for description of the wider background of the state of the art in conservation of natural forests in Europe and for discussing our findings, were chosen without any systematic approach, as is usually applied in the introduction and discussion chapters of the original scientific articles.
We are aware that our approach was biased by subjectivity of the final selection of the literature but any keyword allowed filtering off the less-important papers from those of high importance. Such decisions had to be based on expert knowledge and experience of the authors. However, none of the assessed articles on BF challenged its uniqueness in the country, continent or even world scale, and thus the risk that results of our review will be unbalanced is not high.
In the historical part of the paper we referred to published analyses instead of archival sources directly for two reasons: (1) The review character of this paper dictated focusing rather on already published studies than analyzing original documents, (2) the sheer number of historical sources relevant to the topic (several hundred documents from archives in Poland, Belarus, Russia, Ukraine, Lithuania, Germany and France) would make citing them directly in this paper impossible. We believe that referring to recently published and widely available works containing direct citations of archival sources made this paper more approachable for readers.

3. Geographical and Geological Setting

Białowieża Forest is an approximately 1500 km2 large forest complex stretching over the border between Poland and Belarus, in the eastern part of Central European Lowland (52o41′ N; 23o49′ E; Figure 1). It covers a flat plain with numerous shallow river valleys and a system of depressions and hills. The altitude ranges from 134 m–140 m a.s.l. to 202 m a.s.l. The plain is a part of the larger moraine upland developed during retreat of the ice-sheet of the Warta Glaciation (isotopic Stage 6) [37]. The last glacial (Vistulian/Weichselian) ice-sheet did not cover the region, but periglacial processes resulted in covering older geological formations with younger sediments [38].
The ablation moraine built of sandy clays or clay sands and gravels dominates in the landscape. The second large formation is a bottom moraine built of a layer of clay tills several dozens of meters thick. These two main glacial formations were subject to aeolian and fluvial erosion, which resulted in formation of sandy plains and various types of inland dunes. In the Late Glacial and the Holocene, glacial melting depressions were filled with organic deposits [38], which are now a main source of palaeoecological information.

3.1. Climate

Białowieża Forest lies in the realm of a warm-summer humid continental climate [40]. Mean annual precipitation for the period 1950–2003 was 627.5 mm, with extreme values of 434.5 mm in 1964 and 898.0 mm in 1974. Most of the precipitation (391.1 mm) comes during the May–October [41]. The mean snow cover period lasted for close to 80 days in 1950s, but declined to just 40 days in the last decade [42]. The mean annual temperature (MAT) for the same period was 6.8 °C, with extreme values in 1996 (5.0 °C) and 1989 (8.9 °C). During the period 1950–2015 the MAT increased by 1.27 °C [43], with winter half-year warming much faster than the summer. Despite increasing temperatures and advancing spring [44], the length of the vegetation season did not change [41].

3.2. Biogeography

Białowieża Forest lies within the continental biogeographical region [39] (Figure 1), the zone of hemiboreal, nemoral coniferous and mixed broadleaved-coniferous forests [45]. This is reflected in the species composition of the BF stands, which stand out from West European forests by a lack of beech (Fagus sylvatica L.) and sycamore maple (Acer pseudoplatanus L.). From East European forests it differs by high share of English oak (Quercus robur L.), European hornbeam (Carpinus betulus L.) and small-leaved lime (Tilia cordata Mill.). The high share of Norway spruce (Picea abies (L.) H. Karst.), present in almost all forest communities, makes BF similar to the forests of north-eastern Europe [46]. There are also many animal, plant and fungi species, which reach in the region of BF their geographical northern, southern or eastern range limits. Many boreal and boreo-montane biogeographic elements inhabit the forest, e.g., taiga tick (Ixodes persulcatus Schulze), beetles Rhacopus attenuatus Maeklin and Lacon lepidopterus Panzer, bumble bee Bombus schrencki Morawitz, mosquito Aedes pullatus Coquillet [47], blue hare (Lepus timidus L.), and Laxman’s shrew (Sorex caecutiens Laxmann) [48]. Boreal distribution is characteristic also for several plant species, e.g., Linnea borealis L. or Goodyera repens (L.) R. Br. [49] and fungi species, e.g., Antrodia sitchensis (D. V. Baxter), Boreostereum radiatum (Peck) Parmasto, Fomitopsis rosea (Alb. and Schwein.), Vararia borealis Pouzar [50]. On the other hand, there are several species of a southern, Pontic, or sub-Pontic character, which prefer warm and dry continental or submediterranean climates both among plants, e.g., Glechoma hirsuta (Waldst. and Kit.), Evonymus verrucosus Scop. [49] and fauna, e.g., beetles: Clytus tropicus (Panzer) and Deilus fugax Oliv. [51] and Agrilus antiquus Muls. [52].

4. Naturalness and Biodiversity

A large portion of the BF meets the conditions of forest naturalness “undisturbed by humans” as defined by the European Environmental Agency (EEA) [45], which is in contrast to the forests of adjacent regions, which occupy mostly post-agricultural land and were designed and planted, and fell into the category of “semi-natural forests”. The EEA conditions describing the forest undisturbed by humans are: (1) Natural forest dynamics reflected by natural tree composition, occurrence of dead wood, natural age structure, and natural regeneration processes; (2) the area large enough to maintain its natural characteristics; (3) the last significant human intervention long enough ago to allow re-establishment the natural composition of species and processes. The BF forests meet these three conditions by displaying many features typical of natural forests. (1) It is one of the biggest forest complexes on the European Plain, with high ecosystem integrity [11,18,46] and relatively good connectivity with other forests at least towards the east and north [53]. (2) Its vegetation is close to the potential vegetation, which would cover the area if humans had not interfered [54]. (3) Large portions of BF are still shaped by natural disturbances, especially by insect outbreaks, windthrows, and windbreaks, without the interference of humans [11,46,55,56]. (4) Long-lasting continuous forest cover, combined with a low level of colonization and anthropogenic activities [57], allows the assumption that downed and standing deadwood has been present there incessantly for millennia. (5) The density of large old trees, especially within the limits of the Polish Białowieża National Park (PL BNP), and of hollow and veteran trees is outstandingly high there [58,59]. (6) The share of old-growths older than 100 years (Figure 1B)—originated before the introduction of modern forestry to BF—is very high [18,60]. (7) In effect, BF hosts extremely high species richness (for a European temperate lowland forest) of all forest taxonomic groups, especially forest birds [61], insects [47,55], macrofungi [62], and lichens [63] (Table 1). (8) The forest hosts a high number of ancient forest plant species sensu Hermy [64] and many relic species of natural forests among invertebrates, lichens, and fungi [63,65,66]. (9) The low level of conversion of natural communities [54] is expressed in the relatively low share of non-forest species of birds [67] and plants [68] in the ecosystem. (10) The mammal community is close-to-complete for the Central European Lowland [69], including the most numerous population of European bison Bison bonasus L. in the World and high ecological importance of big predators, especially grey wolf Canis lupus L. and European lynx Lynx lynx L. [70]. (11) Many species exhibit primeval behaviour, e.g., common swift Apus apus L. nests on large dead oak trees, predators considered nowadays as open area specialists, like the common buzzard Buteo buteo L., hunt under the forest canopy, etc. [71].

4.1. Habitats

The BF is a mosaic of habitats (abiotic conditions) covered by an overlapping mosaic of forest vegetation ordered in accordance with a natural toposequence: From floodplain forests in the river valleys to mesic pine forests at the tops of sandy hills [46]. Natural toposequences have gone in many European forests, mainly due to the homogenisation of habitats resulting from intensive silviculture. In the western (Polish) part of BF forest communities cover about 96% of the area [72], while in the eastern (Belarussian) part their cover is about 90% [18]. Completely different classification of vegetation types used in western and eastern part does not allow a common characterization of the habitat structure. Very roughly, over 50% of the western part of BF is covered by the mesic and mesotrophic habitats of mixed deciduous forests, which potentially should be covered by oak-lime-hornbeam forest (Tilio-Carpinetum)—an unevenly aged, multi-species and multi-layered deciduous forest with a high share of C. betulus, Q. robur, Acer platanoides L. and T. cordata [72]. The eastern part is covered by close to 60% in poorer and drier habitats of coniferous, mostly pine forests. In spite of the very clear difference in habitat cover, the share of stands dominated by conifers is very high in both parts (55.1% vs. 68.7% in the western and eastern part, respectively; Table 2), which reflects conversion of natural ecosystems by forest management during the last century, with replacement of mixed deciduous forests by Scots pine Pinus sylvestris L. and Norway spruce plantations, especially in the western part of BF.
The heterogeneity of habitats is increased by the diversity of microhabitats typical to natural forests: Deadwood, broken and uprooted trees, tree cavities, fruiting bodies of fungi, animal carcasses, etc. The average amount of deadwood in the strictly protected core area of PL BNP is close to 159 m3 ha−1 (50.1 (± 4.5) m3 ha−1 of standing dead trees and 108.4 (± 5.3) m3 ha−1 of downed coarse woody debris). At the same time the average standing wood volume of living trees is 472.5 (± 11.8) m3 ha−1 [73]. It supports especially diversity rare cryptogams [74], macrofungi [50] and plays some role in maintaining vascular plant populations [75]. Presence of microhabitats typical to natural forests is very important also for animals: 30% to 50% of the animal species are saproxylophilic, i.e., associated with deadwood [55]. Even birds are very dependent on structures typical to natural forests—species composition of their communities depends more on microhabitat availability than on tree species composition of stands (deciduous vs. coniferous) [76].

4.2. Species

The mosaic of different environmental niches, e.g., local ground depressions, root systems of uprooted trees, deadwood in diverse stages of decay, etc., and microniches, e.g., fruiting bodies of tree-growing fungi, tree holes, dead branches, etc., favours high biodiversity [17]. The data on flora and fauna of BF has been gathered since the turn of the 18th and 19th centuries, when the first scientific papers, based on materials collected in the forest, were published [77,78]. During the last century, aside of continuation of floristic and faunistic surveys, over 100 species new to science, mainly fungi and insects, were described from there [79]—and still almost every year new taxons are added [80,81,82]. Out of the vast diversity of life, only data on plants, macrofungi (including lichens) and animals is robust enough to carry out synthesis or comparison to similar temperate forests of Northern Hemisphere, showing the BF outstanding diversity (Table 1).
Flora of BF vascular plants comprises 1070 species, including approximately 670 forest species and close to 400 synanthropic ones [68]. However, the recent real number is much higher, as there are another at least half thousand alien species cultivated in and around of the forest, with many spontaneously dispersing and surviving in the wild [83] (Adamowski, unpubl.). Non-vascular plants are less numerous: There are 200 species of mosses, 63 species of liverworts [66] and one hornwort (Wierzcholska, unpubl.) registered up-to-date, however, the knowledge on these three groups in BF was never critically revised.
BF is one of the most important hotspots of fungal biodiversity both in Poland and Europe [50] (Table 1). Faliński and Mułenko [84] reported close to 1380 fungi and 164 lichen species from only a 144 ha study plot in the Strict Reserve of the PL BNP. The estimated number of fungi in the whole BF probably exceeds 5000 species, of which 1998 taxons of macrofungi has been registered by 2018 [62] and over 500 species of lichens and close to 50 species of associated with them lichenicolous fungi [63] (Table 1). There are many highly endangered or threatened species in this group, and almost 200 species are unknown from other sites in Poland [63]. Some species were described from there as new for science (e.g., Dentipratulum bialoviesense Domański) and found only in very few other sites [85]. Among the European forests, the BF is distinguished also by the richness of polyporoidal fungi. Out of 394 species, known in Europe, 210 polypores were recorded in BF. This is close to 90% of the species of this taxonomic group known from Poland [86] (Table 1).
The critical revision of the knowledge on fauna of BF revealed over 11,564 thousand animal species [47] (Table 1)—a number which can’t be found anywhere else in forests of a comparable size in Europe [55] (Table 1). The last two decades brought records of several hundred species new to the forest (mainly insects), thus, the real number exceeded 12 thousands [Jaroszewicz, unpubl.]. Forest invertebrates, especially saproxylic, are the most valuable component of the fauna of the BF, since many species that have survived here, are extinct or occur only in small, isolated populations in other regions. Just among the beetles alone, over 1000 saproxylic species are recorded, with many relic (primeval) species—typical of natural forests. BF is the most important refuge for primeval forest entomofauna in the European lowlands [47,55,87]. Even among the vertebrates, the best studied taxonomic group of animals of BF [47], there are several species, which had extinct in most of European forests or are limited only to those with high degree of naturalness: European bison, Laxman’s shrew, white-backed woodpecker (Dendrocopos leucotos Bechst.) or Eurasian three-toed woodpecker (Picoides tridactilus L.), to name just the most charismatic.

4.3. Ecological Processes

The course and intensity of ecological processes differ depending on ecosystem biodiversity, species composition, structure, environmental context, historical land use and recent human interference [88,89,90]. In effect ecosystems with a high level of naturalness are driven by different dynamics than those heavily modified by human activities [91,92,93]. In BF, natural processes, undisturbed or just moderately modified by direct human interference, can be observed on a large portion of territory. The long-term continuity of ecological processes is an important, however poorly understood, factor [94].
One of the unique features of BF ecosystems is that soil formation has been only locally disturbed by humans [95]. Over large areas the top layer of soil has not been disturbed by agricultural or silvicultural ploughing, i.e., its formation has been continuous for several centuries or even millennia [96]. Soil formation in a natural forest is influenced by animal activities (e.g., wild boar (Sus scrofa L.) rooting, rodent burrowing), the presence of deadwood and tree uprooting. Especially the latter modifies not just the soil but also creates completely new microhabitats: naked soil, humus heaps, soil micro-relief, etc [17]. This process strongly modifies the distribution and local abundance of understorey species, increasing the heterogeneity of their communities [46].
The BF is very special for the completeness of the life cycles of trees: from seedlings to individuals dying due to advanced age and giant size—a situation rare in the rest of Europe [11] and globally [97,98,99]. However, not just single trees, but in many forest patches, whole stands develop and die in a full natural forest life cycle, from regeneration to their terminal phase, with temporarily occurring open spaces. These processes are accompanied by natural regenerative succession—new assemblages of species develop in places where they previously declined due to gradual changes in the environment or in effect of natural disturbances [46,100,101].
Other outstanding processes of the BF are fluxes of nutrients and energy. This includes cycles of synchronized masting years of trees, which induce oscillations in rodent abundance [102,103] and increase the winter survival of large herbivores [70,104]. The other examples are cycles of insect outbreaks, e.g., Ips typographus [105] or winter moth Operophtera brumata L., causing defoliation or even the death of trees. This in turn changes the amount of light reaching the forest floor and increases the availability of nutrients, which influences forest floor vegetation but also the breeding success of forest birds [106].
The course and dynamics of ecological processes are very important in the light of the recent climate change, as they adjust ecosystems to new conditions by changing species abundance and distribution in space, which leads to a reassembling of species communities and networks of interactions between species. On the other hand, climate warming brings modification of the course, frequency and intensity of natural processes, leading to their increase [107] or decline [108], which influences the rules of ecosystem assembly.

5. Environmental History

The current diversity of the BF is an effect of the natural processes and interactions between nature and humans. Thus, knowledge of the environmental history is essential for understanding of the current state of the ecosystem, as land use legacies influence soil conditions, tree growth, understory vegetation and many other forest characteristics [109,110,111]. However, until recently, the Holocene history of BF was little known, even if palynologists have been interested in this area for several decades [112,113,114,115,116]. Poor stratigraphic and taxonomic resolution of the pollen analyses and a lack of radiocarbon dating are the main limitations of the results of these works with regard to modern standards in palaeoecology. In turn, the study by Mitchell and Cole [117] who analyzed two short profiles from forest hollows, was specifically focused on the last 1300 years of succession patterns in the mixed deciduous Tilio-Carpinetum and mixed coniferous Pino-Quercetum forest communities. Only recently, multiple coring has been done in Strict Reserve of PL BNP [118,119,120] and outside the Park [57]. In the present paper we present selected results of pollen analysis performed in three sites (Figure 1B).

5.1. Holocene Forest History until the Medieval Period

Having regard to differences in species diversity resulting from geographical location, i.e., distance from glacial refugia, dispersal barriers, and climatic parameters influencing migration patterns and the evolution of distribution ranges of tree species in Europe [121,122], the general features of the early and mid-Holocene history of BF and the timing of the main stages in the forest’s development follow well-known patterns in the post-glacial vegetation changes in the Central European Lowland (Figure 2A). This concerns Pinus and Betula dominated forests at the beginning of the Holocene and the subsequent expansion of Corylus at c. 10.8 ka [123,124], the Alnus expansion at c. 9.3 ka [124], the formation of mixed deciduous forests between 9 and 8 ka, and their successive transformations since about 6 ka [125,126].
An important change in the forest communities at around 3.8 ka concerned the strong decline of Corylus concurrent with expansion of Carpinus. The Corylus decline is a widely discussed palaeoecological event due to its apparent synchronicity over the European Plain. Climate change [124] or human impact [126] are considered as triggering factors diminishing the share of Corylus in European forests and the subsequent change in their taxonomic structure. It was around that time when the most characteristic of the present-day forest ecosystems of BF, the oak-lime-hornbeam forest (Tilio-Carpinetum type), developed. The specific feature of late Holocene BF history was the gradual expansion of Picea, which accelerated first at about 1.5 ka and then after 1 ka following anthropogenic and natural forest disturbances, and climatic shifts [57,120]. Interestingly, the BF Picea population which forms the south-western limit of the species’ present-day northern distribution range [127] stayed at a very low level for at least 5000 years and started to expand much later as compared to neighboring regions [128].
The pollen data revealed only weak agrarian activity in the Neolithic and the Bronze Age in the BF area (Figure 2B), expressed in slight declines in deciduous tree pollen, the appearance of single cereal (Cerealia-type and Hordeum-type) pollen and the scattered pollen of weed and pasture plants, e.g., Plantago lanceolata L. considered as a palynological indicator of primitive agriculture and animal husbandry [129]. This is in line with the low number of archaeological sites for the typical farmer’s cultures in the BF area in the period between six and three thousand years BP recorded to date [130,131].
In the period between 730–300 BC (the early Iron Age), the deciduous forest habitats were disturbed and openings within the forest were used for settlement and animal grazing as shown by increased proportions of the pollen of ruderal weeds and those typical for pastures. We may assume that also small-scale cultivation developed, but thus far palynological data has not recorded any pollen of cultivated plants for this period [57, Latałowa, unpubl.] which may be due to both too long distance to the nearest cultivated plots and poor pollen productivity and dispersal by the cultivated plants used in that period [cf. 129].
The second, distinct phase of human activity took place in the Late Roman Iron Age (c. AD 220–490). It left a pronounced palynological signature in all studied sites [57,118,120] and archaeological structures and artifacts spread throughout the BF area [118,132]. Pollen data illustrate strong, though probably confined to several small areas, destruction of woodland, development of animal husbandry, and plant cultivation. Cereal cultivation is confirmed by the presence of Secale, Hordeum-type, and Triticum-type pollen while Cannabis sativa L. growing and retting has been confirmed by both pollen and seeds found in a former pond situated within the present-day Strict Reserve of the PL BNP [57,118,120]. Local forest destruction due to the development of metallurgy based on the local wood and bog iron ore resources has been also suggested [118] and confirmed by the archaeological finds of iron smelting furnaces and slag for both the early and late Iron Age cultures in the region [133,134,135].
After abandonment of the Iron Age settlements, the forest recovered on the earlier disturbed grounds, with P. abies among the species which expanded vigorously. For next several hundred years the BF was not extensively inhabited. Low frequency of anthropogenic indicators, including scattered pollen of cereals (mainly Secale) and P. lanceolata, suggests very limited use of this area up to about the 15th–16th century. The early Middle Ages and the high medieval period brought some colonization in different parts of BF, confirmed by archaeological investigations [summarized in 118] which, however, illustrate rather site-scale occupancy than a general scale of human impact on the BF area.
The above pollen-based reconstruction of the dynamics of settlement activity from prehistoric times to the medieval period conforms with the archaeological data. However, until recently the archaeological information from the present-day BF area was rather poor because of many restrictions concerning all nature destructive prospects in the protected areas. The new opportunities for discovery of material traces of former land use appeared when non-invasive methods, mainly aerial laser scanning/light detection and ranging (ALS/LIDAR) and geophysics surveys, were implemented for prospecting BF [136,137]. These non-invasive methods are especially effective there, because under patches of old-growth forest where for centuries soil was not disturbed by agricultural activities, traces of ancient human activity are extremely well preserved in comparison to the adjacent regions dominated by agriculture [134].

5.2. High Medieval Period and Modern Times

Studies of the BF’s natural history in late medieval and modern times are strongly supported by existing historical documents, extracted during an extensive surveys in historical archives in Poland, Belarus, Russia, Lithuania, and Ukraine [138,139], and in already published sources [140,141,142,143]. The historical information compiled with archaeological traces left in the forest environment and the palynological imprint of settlement activity and forest use recorded in the sediments (Figure 3), enables rather detailed reconstruction of the BF history.
In the late mediaeval period, BF was the hereditary property of Lithuanian grand dukes [144], and had been a royal forest since the Polish-Lithuanian union of 1385. From that time until the end of the 18th century, BF was protected with the aim of preserving so called animalia superiora: European bison, brown bear Ursus arctos L., red deer Cervus elaphus L., and moose Alces alces L. for the purposes of royal hunts. However, between 1409 and 1784 fewer than 20 royal hunts have been confirmed by written sources [145] which implies that they had a rather limited impact on the forest’s functioning and structure. The regulations of a royal forest dedicated to hunting included limitations untypical to other European or Polish forests of that period, which resulted in saving of its high degree of naturalness untill 20th century: Prohibition of settling in the forest as well as prohibition of hunting (apart from royal hunts) and commercial timber felling. The forest itself was surrounded by a ring of guard villages in which royal guards, riflemen, and beaters dwelled [140,141]. Royal hunting manors with accompanying settlements were the only exception to the rule of no settlements inside the forest until the second half of the 18th century [146].
The above restrictions did not prohibit traditional use of BF. Local villages, towns, and churches developing in the surrounding areas were granted ‘royal access rights’ to use precisely delimited parts of the forest (Figure 4). The majority of such rights included haymaking, i.e., permission to scythe forest meadows, usually along river valleys, remove hay from the forest or store it locally in meadows in haystacks till the winter. The second most important access right was the traditional bee-keeping: carving artificial beehives in tree trunks, attracting bees, and harvesting honey and wax. The third most important access right concerned construction of small dams on forest rivers, aimed at creating artificial flooded areas for fishing [139,147]. Unfortunately, due to disturbances in peat accumulation, the period between the 14th to 16th centuries is not well reflected in the pollen profiles. Persistent droughts recurring in the Middle Ages [148] were the most probable reason for temporary drying out of the peatbogs resulting in discontinuity of the pollen records. Nevertheless, in all the preserved sediment fragments representing that period, indicators of human activity occurred in very low frequencies confirming the historical information on the limited impact on the forest ecosystem and no or very weak local agricultural activity [118].
In the 17th–18th centuries, new ways of forest use were introduced: Collection of bog iron ore in river valleys [135], charcoal burning [149], potash manufacturing [140,141,150], birch tar and pine tar production [138]. In the period 1765–1795, small-scale commercial timber extraction took place [140,141], with an average annual yield intensity estimated to 0.05–0.3 m3 ha−1, and the establishment of associated new permanent villages and small ephemeral hamlets inside the forest to host specialised workers [138]. Dendrochronological research confirmed that in this period BF experienced frequent fires of low intensity and limited spatial extent [151]. This period left a distinct, very characteristic palynological imprint [118,120] (Figure 3): Evidence of strong hornbeam decline and less distinct oak and lime declines. Spruce expanded on habitats of deciduous forests disturbed by human activities. The use of fire, reflected by high frequencies of microcharcoal particles, resulted in expansion of Calluna vulgaris (L.) Hull. Increased proportion of Artemisia pollen reflects ruderal vegetation which probably expanded in patches of disturbed forest. Small-scale agriculture activity is proven mainly by Secale pollen, while the small amount of pollen typical of open pastures (e.g., P. lanceolata) indicates that this form of land use was rather limited.
The next change was brought by the year 1795, when Poland lost its independence, and BF fell under Russian imperial rule. The Russian administration introduced a strict policy against fire, and banned potash and charcoal burning, construction of river dams and fish ponds, and extraction of bog iron ore. Traditional forest bee-keeping was gradually converted to household bee-keeping, and finally prohibited in the traditional form in 1888 [152,153]. Haymaking and forest livestock pasturing continued but was limited to the areas in the direct vicinity of villages [154], however, cattle grazing still had a significant negative effect on forest regeneration [155,156,157].
The Russian administration attempted to introduce large-scale logging, yet their efforts were limited and eventually marred by the lack of roads and conflict with the priority given to conservation of European bison [153,158]. In effect, although forest taxation was carried out and the forest was divided into compartments (in 1843–1846), timber exploitation was limited and interspersed with prolonged periods of prohibition on felling [143,159]. Until the end of the 19th century, all logged stands were left for natural regeneration. Artificial forest regeneration by sowing or planting was conducted only experimentally on some limited areas at the end of the century [159].
The impact of the 19th century management on BF is well reflected in pollen analysis [118,120]. The deciduous trees, mainly C. betulus and Quercus re-expanded, reaching a similar level as that in the medieval period. Also P. abies reinforced its position among the main forest components, mainly at the cost of pine. The decline of microcharcoal particles and the pollen of Artemisia indicates regeneration of the forest floor after the cessation of fires and previous forest utilisation. On the other hand, the small, concurrent increase of agriculture indicators is in line with the historical data indicating the gradual growth of settlement activity in BF during the 19th century [46,160].
At the end of the 19th century and the beginning of the 20th century, BF ecosystems were significantly affected by high densities of game populations [46]. After the first tsar’s hunt in 1860, BF was gradually transformed into an imperial game reserve, and in 1888 the entire BF became the private property of the tsar’s family [152,153]. The new management aimed at maximizing game numbers through the extirpation of predators, supplementary feeding of game for up to six months per year in hundreds of feeding sites, the reintroduction of red deer (extinct in the 17th–18th century), and the introduction of alien fallow deer Dama dama L. and Siberian roe deer Capreolus pygargus Pallas [152,153,161]. The high density of ungulates had tremendous impact on tree recruitment, changing the proportion of tree species [162]. Due to high browsing pressure in oak-lime-hornbeam stands, the share of deciduous trees declined while spruce expanded [46], which several decades later, at the end of the 20th century, resulted in large-scale spruce die off on fertile habitats. The process has been recently accelerated by climate change and the resulting recurring I. typographus outbreaks allowing broadleaved tree stands to regenerate [46,163,164].

6. The 20th and 21st Centuries: Silviculture versus Conservation

The 20th century brought increasing threat to the BF natural ecosystems posed by logging, tree planting on cleared sites, and settlement development. At the same time, the legal protection of BF as a nature treasure started. During the First World War (WWI), mechanized timber exploitation was introduced for the first time to BF by the German army, with annual timber extraction in the period 1915–1918 estimated between 1.91 m3 ha−1 [165] and 8.57 m3 ha−1 [159]. In 1921, to preserve the most valuable, never-logged parts of BF, the Polish government established the first nature reserve, the beginning of the recent PL BNP. Outside the reserve, in the years 1921–1939, commercial timber extraction was continued and forest stands were artificially replanted, mainly by Scots pine and Norway spruce [159]. During the Second World War (WWII), both Soviet (1939–1941) and German (1941–1944) occupants marked their presence in the area with timber extraction and parallel proclamation of a “reserve” dedicated to hunting [159]. The post-war era saw BF divided between Poland and the Belarusian Soviet Socialist Republic of the Union of Soviet Socialist Republics (Figure 1B). The majority of the Polish part stayed subject to regular forest management combined with protected enclaves scattered in the matrix of commercial stands. In 1947 the PL BNP was (re)established within limits similar to the pre-WWII reserve, and strict protection approach was applied on close to 90% of its area. In 1996 the area of the PL BNP was doubled to 10,517 ha, with strict protection expanded to 6059 ha. In the commercial part of the forest, the first nature reserve was established in 1961, and recently there are 21 nature reserves, covering 12,034 ha. Atop of this the whole Polish part of the BF is an area of landscape conservation (national level protected area (PA)), Natura 2000 site (European Community level PA) and global-level PAs: United Nations Educational, Scientific and Cultural Organization (UNESCO) Biosphere Reserve and the transboundary UNESCO World Heritage Site ‘Białowieża Forest’, encompassing western and eastern part of the forest.
Taking into account that in Polish part of BF competencies of several administrations (the national park, the regional directorate of environmental protection, the general directorate of environmental protection, the state forests, the local communes), with different management goals, overlap in the field, it had to lead to an outbreak of a conflict on management of the forest. This, during the period 2016–2018, involved international players (UNESCO and European Commission) and ended in the European Court of Justice, which in April 2018 banned logging in the forest due to the breaching of several articles of European Commission Bird and Habitat Directives [166]. This conflict, reignited by the outbreak of the spruce bark beetle, was not the first round of the struggle over BF management. The battle between advocates of nature conservation and supporters of silviculture started in 1921, with the establishment of the very first piece of protected area—the beginning of the recent PL BNP. The first conflict, similarly to nowadays, started due to the bark beetle outbreak management: the first warden (1923–1928) of the reserve, professor Józef Paczoski, was expelled from the position in 1928 by the Director of State Forests in Białowieża, due to accusations of “bringing the risk of disaster to forests by allowing development of bark beetles in the reserves” [167].
The Belarusian (Soviet till 1991) part of the Forest, since 1944 was managed as ‘zapovednik’ (the highest form of nature conservation in the Soviet Union) till 1956, then a state game reserve (1956–1991) and finally was converted into the Belarusian State National Park “Belovezhskaya Pushcha” (BSNP) in 1991 [168]. The BSNP covers recently 153,000 ha, including the whole eastern part of the BF, with its foreground. For the moment it allows the avoidance of social perturbations and conflicts over forest management. As both parts of the BF compose the transboundary UNESCO World Heritage Site “Białowieża Forest” (Figure 1B), a common concerted management approach needs to be developed.

7. Trends and Forecasts

Palynological studies confirm that BF has been changing everlastingly [57]. This is one of the basic features of the natural forest dynamics: continual change in the proportion and composition of species assemblages, that assures the persistence of ecosystems [46]. The palynological data, archaeological records, and historical documents all confirm that BF was visited, settled, and used by humans in prehistoric and historic times. However, its transitional location between Central and Eastern Europe, from both a biogeographic and climatologic point of view [46], as well as from the cultural and political point of view [169], have resulted in its marginal location in relation to the centres of any developing cultures [170]. Thus, settlement density was here distinctly lower than in most of the Central European Lowland. Periods of relatively higher settlement activity, in the early and late Iron Age, were followed by several centuries of untraceable or very weak human activity, allowing forest regeneration. Even in medieval times settlement was still rather sparse, having only a local impact on the forest, as suggested by the very slight palynological signature of humans [57,118]. The main difference in the level of preservation of BF in comparison to other Central European forests is an effect of the unique system of protection lasting for more than 500 years, from the end of the 14th to the 19th centuries [145,149]. The long-lasting prohibition on settling and agriculture inside the forest, the regulation and limitation of all types of forest use, and the lack of artificial forest planting and 19th-century management towards conservation of bison all resulted in the preservation of the natural, iconic forest up to the beginning of the 20th century [138,145,149,153,158], fragments of which survived until the beginning of the 21st century [11]. However, current accelerating climate change, combined with trends in societal development and human environmental impacts puts further survival of this forest at risk. The climatic models for north-eastern Poland forecast an increase of temperatures, especially in the winter period, a slight increase in precipitation (by 10–20%), and an increase of the length of the growing season in the next decades [171]. These changes will cause shifts in species ranges and dominance, which will alter interspecies interactions, and in effect will change the structure, biodiversity, and functioning of forest ecosystems. It is anticipated that in this part of Europe, especially the roles of two tree species may dramatically change: Norway spruce and European beech [172,173]. The contemporary natural range of beech does not cover BF, however, it is expected to expand towards the north and east [174], which means colonization of the region. Beech is highly shade tolerant and in effect very competitive to other trees [175]. Therefore, its establishment may potentially lead, in the longer time scale, to rearrangement of the BF tree stands. The situation of the Norway spruce is the opposite to beech: it has recently been one of the main components of the BF tree stands on almost all habitat types [46] but is expected to gradually decline and its natural range limit is going to shift 100 km–200 km towards the north and north-east [173]. This may cause the extinction of species strictly associated with spruce and the decline of those which are partly dependent on it. Thus, the forest structure, biodiversity, and function are going to change seriously, because trees are the foundation species of forest ecosystems [176,177]. The changes already have started and some are taking place in a relatively rapid way, which alerts forest managers. The share of Norway spruce had been seriously reduced in the managed part of the Polish BF during the period 2013–2018 as a result of the recent bark beetle outbreak [19]. However, in the strict reserve of the PL BNP the share of boreal tree species (e.g., Norway spruce, Scots pine) declines and species typical of temperate deciduous forests (e.g., hornbeam and small-leaved lime) expands already for several decades [178]. The other adjustments of species and communities to climate change are less obvious. It is reflects in plant and bird phenology, which follows advancing springs, starting weeks earlier than a few decades ago [44,179,180]. There are also warmth demanding southern species of insects, which colonised BF during the last decade, e.g., Mantis religiosa L. [119], Xylocopa valga Gerstaecker [181] and Sceliphron destillatorium Ill. [Jaroszewicz, unpubl.]. However, some taxonomic groups seem to be resistant to climate change or react with a time lag, e.g., composition of understory plant and epiphytic lichen assemblages do not show any signs of thermophilization [182,183].

8. Conclusions

The anticipated shift in forest biodiversity, structure, and dynamics yields a natural temptation to act against these changes, to save the status quo of biodiversity as we know it from our times [184,185,186,187]. However, most of the species threatened by the oncoming change are also present elsewhere and intervention usually brings side effects: further disturbs disturbed ecosystems even more deeply [188]. An active approach to management of biodiversity is inevitably associated with the conservation dilemma, that measures implemented to favour a specific threatened species or habitat will impede the conservation of other threatened species [189,190,191] or will bring the decline of other often neglected or unknown species. Thus, in BF—the best preserved forest ecosystem of temperate Europe—active nature conservation should be limited in space to only those places, where human-dependent species or habitats require intervention to persist.
In our intensively managed landscapes, we need to set apart some forest ecosystems (the more natural, the better) from direct human interference to allow shaping them by natural processes. We need knowledge on the natural drivers, trends, and mechanisms of change, to upgrade nature conservation and forest management towards sustainability and real multifunctionality in face of global change [192,193,194]. The main problem in acquisition of this knowledge lies in the fact that the reaction of managed forests to climate change is disturbed by current silvicultural actions and by the legacies of historic management [89,90,94,188]. This goal can be achieved only if the forest ecosystem is set aside for long enough to recover from previous forest management, and its size exceeds the minimal area needed for maintaining its natural dynamic state of equilibrium. However, we do not know what the size of such a minimal area for European temperate forest is, but we also have no place to study it, except the BF. For this reason it is extremely important to protect the whole BF in as natural a condition as possible [60]. We do not have any more natural forest ecosystems of this size in the temperate zone of Europe [11]. Without the possibility of resurveying ecosystems kept out of direct human management, we will be not able to understand the accelerating changes caused by global warming [184,195]. Therefore, we need to maintain the high naturalness of the BF and allow its self-restoration in disturbed fragments, by protecting the continuity of ecological processes.
Since the whole Belarusian part of the forest, including its foreground, is protected as a national park [18], with 58,000 ha of strict protection, the future prospects of BF depend on development in nature conservation in the Polish part. That is, where silviculture is still increasing the fragmentation and isolation of the last patches of the close-to-natural stands within human designed commercially converted stands, which depart the whole BF dangerously further from the natural state, with each year of silvicultural activity [19,196]. The challenges brought by climate change require the preservation of large set-aside reference areas, where processes associated with forest ecosystem resilience and adaptation to new environmental conditions can be maintained, including evolutionary processes [184]. Society and science urgently need such reference areas to study nature’s inherent ability to adapt to climate change and to devise functional climate adaptation policies in managed forests [197,198,199]. From this point of view, BF is an irreplaceable living laboratory for ecological and evolutionary sciences, and should become a prime model for nature conservation and forest research, and an important benchmark for conservation science and modern forestry.

Author Contributions

B.J. conceived the idea and led the writing of the manuscript together with O.C.; All authors wrote specific parts of the manuscript (environmental history: M.L., M.Z. and T.S., biodiversity: B.J. and J.M.G., introduction and recent history: B.J. and O.C.) and contributed critically to the drafts of the whole manuscript.

Funding

The palaeoecological research reported in this study was funded by the Polish Ministry of Science and Higher Education/Polish National Science Center (project MNiSW/NCN: N N305 167839) and statutory funds of the University of Gdańsk (530-L145-D581-18).

Acknowledgments

The authors thank Anna Pędziszewska for providing a part of the palynological unpublished data used in this publication. The development of the ideas in this paper benefited greatly from the participation of B.J. in the ALTER-Net AHIA 2018-2019 project granted to Per Angelstam “Land-sparing vs. land-sharing for functional green infrastructure that sustains biodiversity and ecosystem services?—European landscape approach initiatives provide regionally adapted solutions”.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Biogeographic setting of Białowieża Forest. (A) Białowieża Forest (BF) on the background of the continental biogeographic regions of Europe [39]. Biogeographical regions: 1—Alpine; 2—Atlantic; 3—Boreal; 4—Continental; 5—Mediterranean; 6—Pannonian; 7—Macaronesia; 8—not covered. (B) Visualisation of the age of stands of Białowieża Forest (following 18, modified): SB—state border; WHS—border of the World Heritage Site “Białowieża Forest”; N-FH—non-forest habitats. Red circles denote recent palynological sampling sites, circles with names denote palynological sites used for analyses shown at Figures 2 and 3.
Figure 1. Biogeographic setting of Białowieża Forest. (A) Białowieża Forest (BF) on the background of the continental biogeographic regions of Europe [39]. Biogeographical regions: 1—Alpine; 2—Atlantic; 3—Boreal; 4—Continental; 5—Mediterranean; 6—Pannonian; 7—Macaronesia; 8—not covered. (B) Visualisation of the age of stands of Białowieża Forest (following 18, modified): SB—state border; WHS—border of the World Heritage Site “Białowieża Forest”; N-FH—non-forest habitats. Red circles denote recent palynological sampling sites, circles with names denote palynological sites used for analyses shown at Figures 2 and 3.
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Figure 2. Combined palynological data from the Czerlon and BIA/161A sites (see Figure 1B), illustrating the Holocene history of Białowieża Forest: (A) Changes in the pollen proportions of the main tree taxa and non-arboreal pollen (NAP); (B) Changes in the pollen proportions of cereals and Plantago lanceolata against archaeological periodisation. The age scale is based on an OxCal age/depth model considering 14 14C dates. Source of the data: [57] (Pędziszewska and Zimny, unpubl.).
Figure 2. Combined palynological data from the Czerlon and BIA/161A sites (see Figure 1B), illustrating the Holocene history of Białowieża Forest: (A) Changes in the pollen proportions of the main tree taxa and non-arboreal pollen (NAP); (B) Changes in the pollen proportions of cereals and Plantago lanceolata against archaeological periodisation. The age scale is based on an OxCal age/depth model considering 14 14C dates. Source of the data: [57] (Pędziszewska and Zimny, unpubl.).
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Figure 3. Selected palynological data from the BIA/131C site (see Figure 1B) illustrating BF history in the mediaeval and modern times: (A) Changes in the pollen proportions of the main tree taxa and non-arboreal pollen (NAP); (B) Changes in the pollen proportions of Artemisia, Cerealia (sum) and Plantago lanceolata, and concentration of microcharcoal particles in the sediments. The age scale is based on an OxCal age/depth model considering 8 14C dates and 210Pb dating. Source of the data: [120].
Figure 3. Selected palynological data from the BIA/131C site (see Figure 1B) illustrating BF history in the mediaeval and modern times: (A) Changes in the pollen proportions of the main tree taxa and non-arboreal pollen (NAP); (B) Changes in the pollen proportions of Artemisia, Cerealia (sum) and Plantago lanceolata, and concentration of microcharcoal particles in the sediments. The age scale is based on an OxCal age/depth model considering 8 14C dates and 210Pb dating. Source of the data: [120].
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Figure 4. Distribution of access areas in BF in the 15th–17th centuries based on historical sources (access areas of unknown size marked by a standard circle), with type of allowed utilization marked (only cases with known type of activity).
Figure 4. Distribution of access areas in BF in the 15th–17th centuries based on historical sources (access areas of unknown size marked by a standard circle), with type of allowed utilization marked (only cases with known type of activity).
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Table
Table 1. Species richness of some taxonomic groups of organisms of Białowieża Forest (1500 km2) on the background of species richness of Poland (312,700 km2) and the United Nations Educational, Scientific and Cultural Organization (UNESCO) forest world heritage sites from Palearctic and Nearctic, for which published data was available. BF—Białowieża Forest, NP—National Park, “-”—data not available. Source of data: [18,47].
Table 1. Species richness of some taxonomic groups of organisms of Białowieża Forest (1500 km2) on the background of species richness of Poland (312,700 km2) and the United Nations Educational, Scientific and Cultural Organization (UNESCO) forest world heritage sites from Palearctic and Nearctic, for which published data was available. BF—Białowieża Forest, NP—National Park, “-”—data not available. Source of data: [18,47].
Taxonomic GroupBFPolandCentral Sichote AlinGreat Smoky Mts.Mount HuangshanWood Buffalo NPYellow-Stone NPFenglin Nature Reserve
1500 km2312,700 km215,539 km22090 km2154 km244,800 km28983 km2184 km2
Number of Species
Animals12,00040,000------
Birds250454370240170226311220
Mammals59117716648476752
Insects960028,000------
Beetles3199--2518----
Plants 12803438------
Vascular plants10702491120014501650*-1700568
Bryophytes263947------
Fungi339811,000------
Macrofungi19983200------
Polypores210240-----161
Microfungi14006000------
Lichenicolous fungi50240------
Lichens50016554004311650*-186-
* The total number of vascular plants and lichens together.
Table
Table 2. Share (%) of the main tree species (according to tree species prevailing in the stand) in Białowieża Forest in the western (Polish—as of 2001) and eastern (Belarussian—as of 2005) part. Source of data: [18].
Table 2. Share (%) of the main tree species (according to tree species prevailing in the stand) in Białowieża Forest in the western (Polish—as of 2001) and eastern (Belarussian—as of 2005) part. Source of data: [18].
Tree SpeciesWestern PartEastern Part
Scots pine Pinus sylvestris28.358.0
Norway spruce Picea abies26.810.7
Black alder Alnus glutinosa20.015.3
English oak Quercus robur11.04.7
Silver birch Betula pendula
and Downy birch Betula pubescens		8.38.3
Hornbeam Carpinus betulus2.21.0
European ash Fraxinus excelsior2.21.1
Aspen Populus tremula0.70.8
Other (small-leaved lime Tilia cordata, Norway maple Acer platanoides, Ulmus sp., Salix sp.)0.50.1

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Jaroszewicz, B.; Cholewińska, O.; Gutowski, J.M.; Samojlik, T.; Zimny, M.; Latałowa, M. Białowieża Forest—A Relic of the High Naturalness of European Forests. Forests 2019, 10, 849. https://doi.org/10.3390/f10100849

AMA Style

Jaroszewicz B, Cholewińska O, Gutowski JM, Samojlik T, Zimny M, Latałowa M. Białowieża Forest—A Relic of the High Naturalness of European Forests. Forests. 2019; 10(10):849. https://doi.org/10.3390/f10100849

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Jaroszewicz, Bogdan, Olga Cholewińska, Jerzy M. Gutowski, Tomasz Samojlik, Marcelina Zimny, and Małgorzata Latałowa. 2019. "Białowieża Forest—A Relic of the High Naturalness of European Forests" Forests 10, no. 10: 849. https://doi.org/10.3390/f10100849

APA Style

Jaroszewicz, B., Cholewińska, O., Gutowski, J. M., Samojlik, T., Zimny, M., & Latałowa, M. (2019). Białowieża Forest—A Relic of the High Naturalness of European Forests. Forests, 10(10), 849. https://doi.org/10.3390/f10100849

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