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Keywords = Caulacanthus okamurae

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20 pages, 3059 KB  
Article
Climatic Changes Shift Macroalgal Assemblages from Cold- to Warm-Adapted Species: The Venice Lagoon as a Study Case
by Adriano Sfriso, Yari Tomio and Andrea Augusto Sfriso
Environments 2025, 12(5), 149; https://doi.org/10.3390/environments12050149 - 2 May 2025
Cited by 2 | Viewed by 1586
Abstract
Temperature increase is one of the main effects of climate change occurring worldwide, with drastic impacts on both terrestrial and aquatic biota. Changes in the dominant macroalgal taxa in the Venice Lagoon have been analyzed in relation to the rise in air temperature [...] Read more.
Temperature increase is one of the main effects of climate change occurring worldwide, with drastic impacts on both terrestrial and aquatic biota. Changes in the dominant macroalgal taxa in the Venice Lagoon have been analyzed in relation to the rise in air temperature recorded since 1973, highlighting the significant decline in cold-adapted species, which have been replaced by taxa more tolerant of higher temperatures. Cold-adapted species such as the native Fucus virsoides, Punctaria latifolia, Scytosiphon lomentaria, and many other Phaeophyceae are in decline, whereas thermophilic species such as the non-indigenous species (NIS) Gracilaria vermiculophylla, Agardhiella subulata, Solieria filiformis, Hypnea cervicornis, Caulacanthus okamurae, and many others have replaced the species that once dominated the lagoon. These changes have been associated with an average air temperature increase of approximately 2.5 °C. The highest increase has mostly been recorded for average minimum temperatures (+2.8 °C), compared to average maximum temperatures (+2.0 °C). As a result, Phaeophyceae have declined, while Rhodophyceae, especially recent NIS introductions, have colonized the lagoon bottoms. Changes in Chlorophyceae, on the other hand, appear to be more linked to the reduction of the lagoon’s trophic conditions, although the currently dominant species is Ulva australis, a NIS that has replaced the native Ulva rigida almost everywhere. Full article
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15 pages, 1132 KB  
Article
Alien Macroalgal Rearrangement in the Soft Substrata of the Venice Lagoon (Italy): Impacts, Threats, Time and Future Trends
by Adriano Sfriso, Marion Adelheid Wolf, Alessandro Buosi, Katia Sciuto and Andrea Augusto Sfriso
Sustainability 2023, 15(10), 8256; https://doi.org/10.3390/su15108256 - 18 May 2023
Cited by 9 | Viewed by 2320
Abstract
Non-native species are a concern for aquatic environments both for the ecosystem biodiversity and from the economical point of view. The Venice Lagoon is a Mediterranean hotspot of alien introductions and macroalgae are probably the most represented systematic category. For this reason, alien [...] Read more.
Non-native species are a concern for aquatic environments both for the ecosystem biodiversity and from the economical point of view. The Venice Lagoon is a Mediterranean hotspot of alien introductions and macroalgae are probably the most represented systematic category. For this reason, alien macroalgal distribution and variation were monitored in late spring-autumn surveys, carried out in 2011, 2014, 2018 and 2021 in the soft bottoms of the entire lagoon (87 common stations). Overall, 21 taxa were recorded; three of them (i.e., Acanthosiphonia echinata, Caulacanthus okamurae, Osmundea oederi) are well-established recent introductions for the lagoon, which has increased the total number of non-native species to 33. Ulva australis, previously reported as Ulva laetevirens, is the most abundant species and it is replacing Ulva rigida, especially in the less eutrophic areas. The invasive Gracilariopsis vermiculophylla, an engineering species colonizing the eutrophic choked areas especially in the central lagoon, is instead decreasing. Other abundant established taxa are now dominant components of the lagoon biomass, whereas many others are rare or have small sizes that make their biomass negligible. Overall, these species do not represent serious threats to the environment, but they rather increase biodiversity, with some of them having positive effects on ecosystem services. Full article
(This article belongs to the Special Issue Sustainable Invasive Species Management in Aquatic Ecosystems)
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10 pages, 3550 KB  
Article
Settlement and Spreading of the Introduced Seaweed Caulacanthus okamurae (Rhodophyta) in the Mediterranean Sea
by Antonella Petrocelli, Marion A. Wolf, Ester Cecere, Katia Sciuto and Adriano Sfriso
Diversity 2020, 12(4), 129; https://doi.org/10.3390/d12040129 - 30 Mar 2020
Cited by 10 | Viewed by 3925
Abstract
In this study, we report the first finding of the non-indigenous seaweed Caulacanthus okamurae (Rhodophyta) in the Ionian and Adriatic Seas (Mediterranean). Specimens were identified through molecular analyses based on the plastid ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) marker. The sequences obtained during this [...] Read more.
In this study, we report the first finding of the non-indigenous seaweed Caulacanthus okamurae (Rhodophyta) in the Ionian and Adriatic Seas (Mediterranean). Specimens were identified through molecular analyses based on the plastid ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) marker. The sequences obtained during this study represent the first molecular evidence of the presence of this taxon in the Mediterranean Sea. Stable populations have been detected in some areas of the Mar Piccolo of Taranto (Italy) and in the whole lagoon of Venice, forming dense patches of low turf that reach high biomasses. Turf-forming algae are common in the intertidal zones of tropical regions, but are rare in temperate ones. The particular environmental conditions of transitional water systems, such as the Mar Piccolo of Taranto and the Venice Lagoon, together with the water temperature increase observed in the last years could have favored the settlement and spread of this introduced species. Full article
(This article belongs to the Special Issue Biodiversity of Macroalgae)
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