[OANNES Foro] From current distinctiveness to future homogenization of the world's freshwater fish faunas

[Mario Cabrejos]

Diversity and Distributions

Article first published online: 25 AUG 2014

DOI: 10.1111/ddi.12242


 


 


>From current distinctiveness to future homogenization of the world's
freshwater fish faunas


1.     Sébastien Villéger1,*, Simon Blanchet2,3, Olivier Beauchard4,
Thierry Oberdorff5 and Sébastien Brosse3

1 Laboratoire Écologie des Systèmes Marins Côtiers (ECOSYM), UMR 5119
CNRS-UM2-IRD-IFREMER-UM1, Montpellier, France 2 Station d'Écologie
Expérimentale du CNRS à Moulis, Moulis, France 3 CNRS, ENFA, UMR5174 EDB
(Laboratoire Évolution et Diversité Biologique), Université Paul Sabatier,
Toulouse, France 4 Netherlands Institute for Sea Research (NIOZ), Yerseke,
The Netherlands 5 UMR “BOREA” (IRD 207, CNRS 7208, MNHN, UPMC), DMPA, Museum
National d'Histoire Naturelle, Paris Cedex, France * Correspondence:
Sébastien Villéger, Laboratoire ECOSYM (UMR 5119), Place Eugène Bataillon cc
93; 34095 Montpellier, France.E-mail:
<mailto:sebastien.villeger en univ-montp2.fr> sebastien.villeger en univ-montp2.fr

2.      


Abstract


Aim


Assessing the consequences of a future increase in non-native species
introductions and native species extirpations on taxonomic similarity among
fish faunas.


Location


World-wide.


Methods


We designed 42 scenarios of future species introductions and extirpations to
simulate future fish composition for 1054 river basins. Using these
simulated future compositions, we computed the change in taxonomic
similarity among pairs of fish faunas from historical to future situation at
the river basin, biogeographic realm and world scales.


Results


According to all our scenarios, taxonomic similarity among fish faunas will
strongly increase in the future at the three spatial scales considered. Fish
faunas from the Southern Hemisphere, which are currently the less affected
by taxonomic homogenization, are forecasted to show the steepest changes.
Our scenarios also reveal that non-native species introductions will account
for most of the predicted changes, whereas the effect of native species
extirpations will be weak.


Main conclusions


The predicted future taxonomic homogenization will blur the current high
level of taxonomic dissimilarity among freshwater fish faunas, and
therefore, imperil the conservation programmes based on beta-diversity
mapping.

 



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