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17 pages, 4613 KB

Open AccessArticle

Wintering Waterbirds in the Venice Lagoon, Years 1993–2022: Trends, Spatial Patterns and Management Issues

by Francesco Scarton, Mauro Bon, Chiara Miotti and Roberto Valle

Diversity 2026, 18(5), 276; https://doi.org/10.3390/d18050276 - 1 May 2026

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Abstract

Using International Waterbird Census data spanning 1993–2022, we analysed temporal trends in the abundance and community composition of wintering waterbirds in the Venice Lagoon (NE Italy). We examined total numbers, major lagoon macro-areas (fish farms, open lagoon, coastal littoral zone, minor wetlands), species-level [...] Read more.

Using International Waterbird Census data spanning 1993–2022, we analysed temporal trends in the abundance and community composition of wintering waterbirds in the Venice Lagoon (NE Italy). We examined total numbers, major lagoon macro-areas (fish farms, open lagoon, coastal littoral zone, minor wetlands), species-level and guild-level trends and assessed climate-related community changes through the Community Temperature Index (CTI). Total wintering waterbird abundance increased markedly over the study period, from 74,348 birds in 1993 to 445,350 in 2022. Fish farms (about 20% of the total area) hosted the largest number of individuals (about 83%) and accounted for most of the lagoon-wide increase, while open lagoon (15%) and coastal littoral (<2%) areas showed weaker and more variable dynamics. Species-level analyses revealed pronounced heterogeneity, with strong increases in several Anatidae, contrasted by stable or declining trends in other species. The CTI exhibited a significant long-term increase, indicating a progressive shift towards communities dominated by warm-affinity species. CTI decomposition nevertheless showed this signal was disproportionately driven by a limited number of highly abundant species. Our results indicate that wintering waterbird dynamics in the Venice Lagoon are shaped by the interaction between large-scale climatic processes and local habitat management, particularly within fish farms. While management practices can likely sustain exceptionally high wintering numbers and potentially buffer climate-driven redistribution, they may also promote strong species dominance and associated ecological risks. Integrating long-term census data with climate and functional indicators provides a robust framework for understanding and managing Mediterranean wetlands under ongoing climate change. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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21 pages, 4369 KB

Open AccessArticle

From Hulls to Caves: Insights into the Introduction and Expansion of Non-Indigenous Marine Bivalves of the Genera Isognomon and Malleus in the Eastern Mediterranean Sea

by Eirini Gratsia, Argyro Zenetos, Markos Digenis, Vasilis Gerovasileiou, Panagiotis Kasapidis and Ioannis Karakassis

Diversity 2026, 18(2), 127; https://doi.org/10.3390/d18020127 - 19 Feb 2026

Cited by 1 | Viewed by 1278

Abstract

Although the Eastern Mediterranean Sea is a hotspot for marine bioinvasions, the accurate identification and monitoring of non-indigenous species (NIS) remain impeded by the ambiguous morphologies of species and limited regional genetic data. This study applied an integrative approach, combining morphological identification with [...] Read more.

Although the Eastern Mediterranean Sea is a hotspot for marine bioinvasions, the accurate identification and monitoring of non-indigenous species (NIS) remain impeded by the ambiguous morphologies of species and limited regional genetic data. This study applied an integrative approach, combining morphological identification with DNA barcoding, to assess the taxonomy and expansion of bivalves from the genera Isognomon and Malleus in the Eastern Mediterranean Sea. Specimens were collected from a broad range of habitats, including marinas, ship hulls, reefs, and marine caves. Phylogenetic analyses revealed two distinct Isognomon species in the region: I. bicolor, frequently associated with artificial substrates and showing evidence of multiple introductions, and I. aff. legumen, restricted to cryptic natural habitats. A single species of Malleus cf. regula was also detected, clustering with sequences from neighboring Mediterranean regions. The study highlights the limitations of morphology-based taxonomy and the urgent need to enhance genetic reference databases, particularly with sequences from areas of nativity. As NIS increasingly expand from anthropogenic habitats into natural ecosystems, validated data are essential for risk assessment and conservation management. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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17 pages, 3189 KB

Open AccessArticle

Ecology of the Lasca Protochondrostoma genei (Bonaparte 1939) in the Chiarò di Cialla Creek (Northeast Italy): New Insights from a Biodiversity Hotspot Affected by Alien Species

by Marco Bertoli, Matteo Maglitto, Andreah Sala, Marino Prearo, Paolo Pastorino and Elisabetta Pizzul

Diversity 2026, 18(2), 109; https://doi.org/10.3390/d18020109 - 9 Feb 2026

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Abstract

The lasca Protochondrostoma genei is an endemic freshwater fish of high conservation concern, listed in Annex II of the Habitat Directive and classified as Endangered in Italy. This study investigates the ecology, population structure, and habitat use of P. genei in the Chiarò [...] Read more.

The lasca Protochondrostoma genei is an endemic freshwater fish of high conservation concern, listed in Annex II of the Habitat Directive and classified as Endangered in Italy. This study investigates the ecology, population structure, and habitat use of P. genei in the Chiarò di Cialla Creek (Northeast Italy), a biodiversity hotspot recently designated as a Special Area of Conservation (SAC IT3320041). Particular regard is given to the issue represented by the presence of the common nase Chondrostoma nasus, which competes with the lasca for habitats and trophic resources. Fish assemblages were surveyed by electrofishing during 2023 and 2024, coupled with detailed hydromorphological characterization of mesohabitats. Results highlighted that the lasca showed preference for glides and especially pools, characterized by moderate depths, low to moderate current velocities, high shading, and abundant shelters such as boulders, roots, and woody debris. However, P. genei extensively overlapped in habitat use with the invasive common nase C. nasus, whose density increased markedly during the study period, suggesting ongoing colonization and potential issues for the lasca conservation. Despite moderate river functionality scores and localized anthropogenic pressures, the Chiarò di Cialla Creek remains a key refuge for P. genei. These findings provide essential ecological information to support targeted conservation actions, including habitat management and invasive species control, within protected riverine systems. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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13 pages, 4861 KB

Open AccessArticle

Evaluation of the Validity of the Spanish Eocene Pleurodiran Turtle ‘Duerochelys arribasi’: The Youngest Freshwater Member of Erymnochelyinae (Podocnemididae) in Europe

by Adán Pérez-García, Andrea Guerrero, Santiago Martín de Jesús and Francisco Ortega

Diversity 2026, 18(1), 51; https://doi.org/10.3390/d18010051 - 19 Jan 2026

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Abstract

The validity of the youngest representative of Neochelys described to date, representing the last European freshwater member of Erymnochelyinae, has been considered doubtful. A revision of the previously documented specimens of this Spanish Bartonian or Priabonian (MP 16 or MP 17, middle or [...] Read more.

The validity of the youngest representative of Neochelys described to date, representing the last European freshwater member of Erymnochelyinae, has been considered doubtful. A revision of the previously documented specimens of this Spanish Bartonian or Priabonian (MP 16 or MP 17, middle or late Eocene) species is performed here, along with the analysis of additional unpublished remains from the same geological formation. The principal character originally used to diagnose the species (i.e., paired gular scutes) is refuted here, and interpreted instead as an anomalous variation that is also found in other representatives of the genus. However, Neochelys arribasi is supported as a valid species based on other morphological features. We recognize here an increase in size for the representatives of Neochelys from the Duero Basin over time, which are also the youngest known species of Neochelys. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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Review

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26 pages, 1379 KB

Open AccessReview

Epigenetic Variation in Plant Populations: DNA Methylation as a Driver of Phenotypic Diversity and Adaptation

by Jakub Sawicki, Wiktoria Czochór, Aniela Garbowska, Kamil Koczwara, Jerzy Andrzej Przyborowski, Natan Pupek, Paweł Sulima, Joanna Szablińska and Monika Szczecińska

Diversity 2026, 18(5), 259; https://doi.org/10.3390/d18050259 - 27 Apr 2026

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Abstract

DNA methylation constitutes a primary layer of epigenetic regulation in plants, operating across three sequence contexts (CG, CHG, and CHH) through distinct enzymatic pathways. Over the past fifteen years, accumulating evidence has shown that DNA methylation varies substantially among individuals and populations of [...] Read more.

DNA methylation constitutes a primary layer of epigenetic regulation in plants, operating across three sequence contexts (CG, CHG, and CHH) through distinct enzymatic pathways. Over the past fifteen years, accumulating evidence has shown that DNA methylation varies substantially among individuals and populations of wild plants, sometimes independently of underlying genetic polymorphism. This variation can influence gene expression, transposable element activity, and phenotypic traits relevant to ecological adaptation. Population epigenetics, the study of methylation variation at the population scale, has matured from initial surveys using methylation-sensitive amplified fragment length polymorphism (MS-AFLP) into a discipline increasingly reliant on reduced-representation bisulfite sequencing (epiGBS, bsRADseq), whole-genome bisulfite sequencing (WGBS), enzymatic methyl-seq (EM-seq), and direct long-read detection by nanopore sequencing. These methodological advances are opening population epigenetics to non-model organisms across the full breadth of the plant phylogeny, from angiosperms and gymnosperms to ferns and bryophytes. We cover (i) the molecular machinery underlying plant DNA methylation, including the debated status of N6-methyladenine (6mA); (ii) empirical evidence for natural epigenetic variation in plant populations, spanning clonal, invasive, and outcrossing species; (iii) the methodological toolkit available for population-scale methylation profiling, with emphasis on approaches suitable for non-model taxa; and (iv) the ecological and evolutionary significance of population epigenetic variation, including transgenerational inheritance, stress memory, epigenetic clocks, conservation applications, and the emerging integration of epigenetics into the extended evolutionary synthesis. We identify critical knowledge gaps, particularly the near-complete absence of population-level epigenetic data for bryophytes, ferns, and lycophytes, and outline priorities for future research. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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20 pages, 1399 KB

Open AccessReview

Nature-Based Solutions for Resilience: A Global Review of Ecosystem Services from Urban Forests and Cover Crops

by Anastasia Ivanova, Reena Randhir and Timothy O. Randhir

Diversity 2026, 18(1), 47; https://doi.org/10.3390/d18010047 - 15 Jan 2026

Cited by 1 | Viewed by 1022

Abstract

Climate change and land-use intensification are speeding up the loss of ecosystem services that support human health, food security, and environmental stability. Vegetative interventions—such as urban forests in cities and cover crops in farming systems—are increasingly seen as nature-based solutions for climate adaptation. [...] Read more.

Climate change and land-use intensification are speeding up the loss of ecosystem services that support human health, food security, and environmental stability. Vegetative interventions—such as urban forests in cities and cover crops in farming systems—are increasingly seen as nature-based solutions for climate adaptation. However, their benefits are often viewed separately. This review combines 20 years of research to explore how these strategies, together, improve provisioning, regulating, supporting, and cultural ecosystem services across various landscapes. Urban forests help reduce urban heat islands, improve air quality, manage stormwater, and offer cultural and health benefits. Cover crops increase soil fertility, regulate water, support nutrient cycling, and enhance crop yields, with potential for carbon sequestration and biofuel production. We identify opportunities and challenges, highlight barriers to adopting these strategies, and suggest integrated frameworks—including spatial decision-support tools, incentive programs, and education—to encourage broader use. By connecting urban and rural systems, this review underscores vegetation as a versatile tool for resilience, essential for reaching global sustainability goals. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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Other

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12 pages, 11032 KB

Open AccessBrief Report

Citizen-Led Passive Restoration of a Cork Oak Stand Following the Cessation of Mowing: A Study of the Effects on the Herbaceous Plants

by Corrado Battisti, Nicola Acquisti Casi, Melissa Baroni, Walter Gabriel Chunga Calero, Alessio Fiumi, Alice Proietti, Valerio Sanna, Daniele Squarcia, Damiano Stazi, Giuliano Fanelli, Francesco Zullo and Massimiliano Scalici

Diversity 2026, 18(5), 258; https://doi.org/10.3390/d18050258 - 26 Apr 2026

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Abstract

The cessation of recurrent anthropogenic activities can promote vegetation succession. In this paper, we report a case study of passive restoration of the herbaceous plant vegetation associated with cork oaks carried out by citizens in collaboration with local farmers in a suburban area [...] Read more.

The cessation of recurrent anthropogenic activities can promote vegetation succession. In this paper, we report a case study of passive restoration of the herbaceous plant vegetation associated with cork oaks carried out by citizens in collaboration with local farmers in a suburban area of Rome (Italy). A sampling design has been carried out in two comparable patches using replicated plots: (i) a first patch corresponding to the passive restored area, evolving from an uncultivated field towards a cork oak forest, where the mowing activity was stopped in 2017, and (ii) a second patch corresponding to an uncultivated land periodically mowed as a control. We recorded 24 plant species in the restored patch and 9 in the control patch. The Shannon-Wiener diversity index was significantly higher in the restored patch when compared to the control. Whittaker diagrams, graphically representing evenness, showed significant differences among plotted values. The Chao 2 richness estimators evidence the differences between patches (52.17 species vs. 9), graphically observed in the sample rarefaction curves. An analysis in the 2017–2025 period showed a substantial increase in NDVI values in the restored patch (from 0.18 in 2017 to 0.28 in 2025; approximately +54% relative to 2017; mean NDVI increased from 0.181 in 2017 to 0.29 in 2025), indicating an increase in cover/biomass associated with the post-2017 restoration of the area. Suspending mowing, both humidity (due to the reduction in grass cover) and nutrients increase, and the pH is reduced (Ellenberg indices): it is possible that the young oak trees are comparatively more effective cation exchangers. Therefore, only a few years after mowing was suspended, we observed a marked recovery not only of the dominant cork oak component but also of the herbaceous species (Vulpio-Dasypyretum villosi association). Even young, isolated cork oak trees can act as nurse plants (or keystone structures), supporting many species and creating microhabitats for shade-tolerant plants. This passive restoration began when local citizens and a school asked landowners to stop mowing in an area where cork oaks were naturally regenerating, making it an example of autonomous citizen-led environmental management. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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8 pages, 186 KB

Open AccessPerspective

Behavioural Diversity: Conditional Movement Tactics in the Ruff (Calidris pugnax)

by Michel Baguette

Diversity 2026, 18(1), 32; https://doi.org/10.3390/d18010032 - 8 Jan 2026

Viewed by 478

Abstract

Understanding the movement behaviour of male ruffs (Calidris pugnax) during the breeding season requires integrating recent telemetry data with long-standing theory on conditional reproductive strategies, lek dynamics, and behavioural polymorphism. A large-scale tracking study revealed extensive within-season movements among many males, [...] Read more.

Understanding the movement behaviour of male ruffs (Calidris pugnax) during the breeding season requires integrating recent telemetry data with long-standing theory on conditional reproductive strategies, lek dynamics, and behavioural polymorphism. A large-scale tracking study revealed extensive within-season movements among many males, with individuals visiting 1 to 23 sites, but also documented prolonged residency, with site tenures exceeding 40 days. Such variation is not contradictory but expected in a species whose reproductive system combines genetically fixed alternative strategies, governed by a supergene, with flexible conditional tactics expressed in response to ecological and social cues. Here, I synthesize movement ecology, state-dependent decision models, lekking theory, and previous empirical work to show that spatial behaviour in ruffs reflects a continuum of tactics rather than a homogeneous nomadic mode. Telemetry data thereby enrich our understanding of how individuals navigate fluctuating environments, competitive pressures, and mating opportunities. Embracing behavioural heterogeneity is essential for interpreting movement patterns and for understanding how reproductive diversity evolves and is maintained in lekking systems. Full article

(This article belongs to the Special Issue 2026 Feature Papers by Diversity's Editorial Board Members)

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