Anar al contingut (clic a Intro)
UdG Home UdG Home
Tancar
Menú

Institut d’Ecologia Aquàtica

Key factors explaining critical swimming speed in freshwater fish: a review and statistical analysis

Swimming performance is a key feature that mediates fitness and survival in aquatic animals. Dispersal, habitat selection, predator–prey interactions and reproduction are processes that depend on swimming capabilities.

Testing the critical swimming speed (Ucrit) of fish is the most straightforward method to assess their prolonged swimming performance. We analysed the contribution of several predictor variables (total body length, experimental water temperature, time step interval between velocity increments, species identity, taxonomic affiliation, native status, body shape and form factor) in explaining the variation of Ucrit, using linear models and random forests.

We compiled in total 204 studies testing Ucrit of 35 inland fishes of the Iberian Peninsula, including 17 alien species that are non-native to that region.

We found that body length is largely the most important predictor of Ucrit out of the eight tested variables, followed by family, time step interval and species identity. By contrast, form factor, temperature, body shape and native status were less important. Results showed a generally positive relationship between Ucrit and total body length, but regression slopes varied markedly among families and species. By contrast, linear models did not show significant differences between native and alien species.

In conclusion, the present study provides a first comprehensive database of Ucrit in Iberian freshwater fish, which can be thus of considerable interest for habitat management and restoration plans. The resulting data represents a sound foundation to assess fish responses to hydrological alteration (e.g. water flow tolerance and dispersal capacities), or to categorize their habitat preferences.

Cano-Barbacil, C.; Radinger, J.; Argudo, M.;Rubio-Gracia, F.; Vila-Gispert, A. and García-Berthou, E. (2020). Sci Rep 10, article 18947. In press.

DOI: https://doi.org/10.1038/s41598-020-75974-x

Notícies relacionades

Escull quins tipus de galetes acceptes que el web de la Universitat de Girona pugui guardar en el teu navegador.

Necessàries

Les imprescindibles per facilitar la vostra connexió. No hi ha opció d'inhabilitar-les, atès que són les necessàries pel funcionament del lloc web.

Preferències

Permeten recordar les vostres opcions (per exemple llengua o regió des de la qual accediu), per tal de proporcionar-vos serveis avançats.

Analytics

Proporcionen informació estadística i permeten millorar els serveis. Utilitzem cookies de Google Analytics que podeu desactivar instal·lant-vos aquest plugin.

Marketing

Per a oferir continguts publicitaris relacionats amb els interessos de l'usuari, bé directament, bé per mitjà de tercers (“adservers”). Cal activar-les si vols veure els vídeos de Youtube incrustats en el web de la Universitat de Girona.