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Are Amphipod invaders a threat to the regional biodiversity? Conservation prospects for the Loire River

Piscart, Christophe and Bergerot, Benjamin and Laffaille, Pascal and Marmonier, Pierre Are Amphipod invaders a threat to the regional biodiversity? Conservation prospects for the Loire River. (2010) Biological Invasions, vol. 12 (n° 4). pp. 856-863. ISSN 1387-3547

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Official URL: http://dx.doi.org/10.1007/s10530-009-9506-4

Abstract

The impact of invasions on local biodiversity is well established, but their impact on regional biodiversity has so far been only sketchily documented. To address this question, we studied the impact at various observation scales (ranging from the microhabitat to the whole catchment) of successive arrivals of non-native amphipods on the amphipod assemblage of the Loire River basin in France. Amphipod assemblages were studied at 225 sites covering the whole Loire catchment. Non-native species were dominant at all sites in the main channel of the Loire River, but native species were still present at most of the sites. We found that the invaders have failed to colonize most of tributaries of the Loire River. At the regional scale, we found that since the invaders first arrived 25 years ago, the global amphipod diversity has increased by 33% (from 8 to 12 species) due to the arrival of non-native species. We discuss the possibility that the lack of any loss of biodiversity may be directly linked to the presence of refuges at the microhabitat scale in the Loire channel and in the tributaries, which invasive species have been unable to colonize. The restoration of river quality could increase the number of refuges for native species, thus reducing the impact of invaders

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://link.springer.com The original PDF of the article can be found at Biological Invasions website : http://link.springer.com/article/10.1007%2Fs10530-009-9506-4
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Muséum national d'Histoire naturelle (FRANCE)
Other partners > Université de Rennes 1 (FRANCE)
Laboratory name:
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Deposited By: Pascal LAFFAILLE

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