Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Functional response of fish communities in a multistressed freshwater world |
| Abstract | Freshwater fish communities are impacted by multiple pressures, determining loss of functional diversity and redundancy. Our aim was to disentangle the roles and relevancies of different pressures in shaping fish communities in small streams of the Po plain (North Italy). Long term trend (1998-2018) of functional diversity of 31 fish communities was assessed and modeled in respect to three potential pressures: temperature increase, intensity of exotic fish invasion, and habitat quality degradation. Ecological traits mostly influenced by the pressures were also identified. Reduction of functional richness mostly due to local extinction or contraction of cold adapted predators, such as salmonids, was linked to increasing temperatures. Warming probably also led to a shift of generalist and dominant species, which became more abundant in streams hosting mixed communities of salmonids and cyprinids, and determined the increase of functional dispersion and uniqueness. Reduction of functional redundancy and increasing functional dispersion were both also related to the introduction of new ecological traits brought by expanding exotic species. Low functional overlap was found among native and exotic species, indicating that the invasion process was mainly controlled by competitive interactions and/or resource opportunism. Functional response to habitat quality was not clearly evident. In conclusion, the impact of temperature increase and exotic species on fish functional diversity was effective, idiosyncratic and mediated by the scale of analysis and by the intensity of pressures. (C) 2020 Elsevier B.V. All rights reserved. |
| Source | Science of the total environment 740 |
| Keywords | Functional diversityClimate changeExotic speciesFishRedundancyPo plain |
| Journal | Science of the total environment |
| Editor | Elsevier, Lausanne ;, Paesi Bassi |
| Year | 2020 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.scitotenv.2020.139902 |
| Authors | Stefani, Fabrizio; Schiavon, Alfredo; Tirozzi, Pietro; Gomarasca, Stefano; Marziali, Laura |
| Text | 435246 2020 10.1016/j.scitotenv.2020.139902 ISI Web of Science WOS 000562057800005 Scopus 2 s2.0 85086802605 Functional diversity Climate change Exotic species Fish Redundancy Po plain Functional response of fish communities in a multistressed freshwater world Stefani, Fabrizio; Schiavon, Alfredo; Tirozzi, Pietro; Gomarasca, Stefano; Marziali, Laura Water Res Inst Natl Res Council IRSA CNR; Univ Milano Bicocca; Univ Milan Freshwater fish communities are impacted by multiple pressures, determining loss of functional diversity and redundancy. Our aim was to disentangle the roles and relevancies of different pressures in shaping fish communities in small streams of the Po plain North Italy . Long term trend 1998 2018 of functional diversity of 31 fish communities was assessed and modeled in respect to three potential pressures temperature increase, intensity of exotic fish invasion, and habitat quality degradation. Ecological traits mostly influenced by the pressures were also identified. Reduction of functional richness mostly due to local extinction or contraction of cold adapted predators, such as salmonids, was linked to increasing temperatures. Warming probably also led to a shift of generalist and dominant species, which became more abundant in streams hosting mixed communities of salmonids and cyprinids, and determined the increase of functional dispersion and uniqueness. Reduction of functional redundancy and increasing functional dispersion were both also related to the introduction of new ecological traits brought by expanding exotic species. Low functional overlap was found among native and exotic species, indicating that the invasion process was mainly controlled by competitive interactions and/or resource opportunism. Functional response to habitat quality was not clearly evident. In conclusion, the impact of temperature increase and exotic species on fish functional diversity was effective, idiosyncratic and mediated by the scale of analysis and by the intensity of pressures. C 2020 Elsevier B.V. All rights reserved. 740 Published version Functional response of fish communities in a multistressed freshwater world Functional response of fish communities in a multistressed freshwater world pdf Stefani et al STOTEN ott 2020.pdf Articolo in rivista Elsevier 0048 9697 Science of the total environment Science of the total environment Sci. total environ. SCHIAVON ALFREDO laura.marziali MARZIALI LAURA fabrizio.stefani STEFANI FABRIZIO DTA.AD002.125.001 100 FONTANILI BRUGHERIO DTA.AD001.301.001 ARETE ACQUA IN RETE gestione virtuosa della risorsa idrica e degli agroecosistemi per lincremento del capitale naturale |