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Article

The Role of Climate Changes in the Spread of Freshwater Fishes: Implications for Alien Cool and Warm-Water Species in a Mediterranean Basin

1
Department of Chemistry, Biology and Biotechnologies, University of Perugia, 06100 Perugia, Italy
2
Forest, Economics and Mountain Territory Service, Umbria Region, 06100 Perugia, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: James S. Albert and Angel Perez-Ruzafa
Water 2021, 13(3), 347; https://doi.org/10.3390/w13030347
Received: 10 December 2020 / Revised: 8 January 2021 / Accepted: 25 January 2021 / Published: 30 January 2021
(This article belongs to the Special Issue Effects of Climate Change on Freshwater Biodiversity)
In running waters, under climate change conditions, the combined effect of water warming and decreasing flow rates may encourage colonisation by invasive cool and warm-water fish species. The aim of the study was to analyze the potential climate change effects on the spread of four invasive alien fishes in the Tiber River basin, taking into account the effects of river fragmentation. Fish and environmental data collected in 91 sites over the years 1998–2018, were used to analyze temporal changes in their habitat requirements. A multivariate analysis was conducted, and the hypothesis of a range expansion towards the upstream reaches has been tested. For Barbus barbus, Gobio gobio, Padogobius bonelli and Pseudorasbora parva population abundances and body condition were analyzed. Detectability, occupancy, local extinction and colonization probabilities were estimated. We showed that B. barbus and P. bonelli have significantly extended their range toward upstream. P. parva did not move toward higher altitudes significantly, suggesting that, at this stage, the species has probably reached an equilibrium. River fragmentation, elevation, water temperature and average current speed seem to be major determinants in colonization processes, affecting the dispersal ability of the species. Not surprisingly for species introduced in relatively recent times, the colonization probabilities were much higher than extinction probabilities. Our results provided evidence for some synergistic effects between climate changes and alien fish species invasions, in terms of species range shifts mediated by rising water temperatures, although they should be interpreted cautiously, taking into account that these species most likely were not yet stabilized. View Full-Text
Keywords: non-native fish species; global warming; fish range shifts; dispersal ability; river connectivity; biodiversity conservation non-native fish species; global warming; fish range shifts; dispersal ability; river connectivity; biodiversity conservation
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MDPI and ACS Style

Carosi, A.; Ghetti, L.; Lorenzoni, M. The Role of Climate Changes in the Spread of Freshwater Fishes: Implications for Alien Cool and Warm-Water Species in a Mediterranean Basin. Water 2021, 13, 347. https://doi.org/10.3390/w13030347

AMA Style

Carosi A, Ghetti L, Lorenzoni M. The Role of Climate Changes in the Spread of Freshwater Fishes: Implications for Alien Cool and Warm-Water Species in a Mediterranean Basin. Water. 2021; 13(3):347. https://doi.org/10.3390/w13030347

Chicago/Turabian Style

Carosi, Antonella, Lucia Ghetti, and Massimo Lorenzoni. 2021. "The Role of Climate Changes in the Spread of Freshwater Fishes: Implications for Alien Cool and Warm-Water Species in a Mediterranean Basin" Water 13, no. 3: 347. https://doi.org/10.3390/w13030347

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