Relating life-history traits, environmental constraints and local extinctions in river fish

Bergerot, Benjamin (Hydrosystems and Bioprocesses Research Unit, Irstea, Antony, France ; School of Engineering, Architecture and Landscape (hepia), HES-SO // University of Applied Sciences Western Switzerland) ; Hugueny, Bernard (UMR BOREA, MNHN-IRD-CNRS-UPMC, Muséum National d'Histoire Naturelle, Paris. France) ; Belliard, Jérôme (Hydrosystems and Bioprocesses Research Unit, Irstea, Antony, France)

The life histories of freshwater fish are widely studied because they represent fundamental determinants of population performances. However, a gap remains in our understanding of how species traits may predispose species to extinction in a changing environment. In this study, based on a large data set provided by the French National Agency for Water and Aquatic Environment (325 sites), we analysed factors that explain the probability of local extinction in 40 freshwater species across French rivers. A total of five traits characterised the demography of 40 species, and eight environmental parameters at the 325 sites were examined. Our results agreed closely with an empirical classification of freshwater fish in temperate regions, conforming to three‐endpoint continuum of life‐history ‘strategies’ of species (equilibrium, periodic and opportunist). The probability of local species extinction was closely related to species traits. Equilibrial species tended to show lower annual extinction rates, whereas opportunistic species and, above all, periodic ones exhibited higher extinction values. Nevertheless, prediction of species local extinctions is not trivial and depends not only on particular suites of life‐history traits but also on their interaction with environmental conditions along the longitudinal river continuum.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEPIA - Genève
Institute:
inTNE - Institut Terre-Nature-Environnement
Date:
2015-03
Pagination:
13 p.
Published in:
Freshwater Biology
Numeration (vol. no.):
2015, vol. 60, no. 7, pp. 1279-1291
DOI:
ISSN:
0046-5070
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2020-08-14, last modified 2020-10-27

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