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Coexistence patterns between the invasive amphipod Crangonyx pseudogracilis and native Echinogammarus meridionalis: a laboratory approach

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Freshwater ecosystems are known as hotspots of biodiversity. These systems and their resident shredder communities are very sensitive to multiple anthropogenic environmental disturbances. Disturbance in the form of invasion by alien species is a major contributor to the observed declines in biodiversity. In freshwater shredder communities, non-native amphipod species may negatively affect ecosystem function and energy transfers. The aim of this study was to analyze the interactions between two freshwater amphipods: Echinogammarus meridionalis, native in the Iberian Peninsula, and Crangonyx pseudogracilis, a recently introduced invasive species. The objectives were to determine if the survival of Echinogammarus meridionalis is affected by Crangonyx pseudogracilis in the absence of food. Additionally, the influence of coexistence on functional parameters such as food consumption or moulting rates was also assessed. The presence or absence of food and, in addition, the non-native amphipod presence did not affect the survival of the native species for the duration of the experiment. Nonetheless, E. meridionalis presented a much higher overall mortality. Consumption of alder leaves was significantly higher for E. meridionalis. Overall, these results suggest that C. pseudogracilis effects on E. meridionalis may be residual.
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Keywords: AMPHIPODS; CRANGONYX PSEUDOGRACILIS; ECHINOGAMMARUS MERIDIONALIS SHREDDER; NON-NATIVE SPECIES

Document Type: Research Article

Publication date: 01 June 2017

This article was made available online on 04 May 2017 as a Fast Track article with title: "Coexistence patterns between the invasive amphipod Crangonyx pseudogracilis and native Echinogammarus meridionalis: a laboratory approach".

More about this publication?
  • Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.

    Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.

    Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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