Changes in functional biodiversity in an invaded freshwater ecosystem: the Moselle River |
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Authors: | Email author" target="_blank">Simon?DevinEmail author Jean-Nicolas?Beisel Philippe?Usseglio-Polatera Jean-Claude?Moreteau |
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Institution: | (1) Laboratoire Biodiversité et Fonctionnement des Ecosystémes, Universite dé Metz, UFR SciFA, Campus Bridoux, Av. du Géneral Delestraint, 57070 Metz, France |
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Abstract: | The spread of non-indigenous species and the decline of autochthonous ones are leading to a homogenization of freshwater fauna
in terms of systematic units, but the functional consequences are poorly documented. We studied the peculiar case of the lower,
French section of the Moselle River where 20 invertebrate species have been introduced since 1854, with a rate increasing
exponentially with time. Dredge sampling performed in 1994, 1996, 2000 and 2001 at four sampling stations allowed for an evaluation
of faunal changes in terms of composition, structure and function. During this period, no structural changes were recorded
in spite of multiple, new and successful introductions. The evaluation of functional modifications was based on a typology
of taxa exhibiting homogeneous biological/ecological traits. Functional diversity, measured as the diversity of taxa distribution
among functional groupings, revealed a significant increase between 1994/1996 and 2000/2001 because those species that were
over-represented during the former period reached more equilibrated densities during the latter. The major, indirect implications
of these functional changes are discussed. |
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Keywords: | invasive species freshwater macroinvertebrates bio/ecological traits functional diversity biomonotony concept |
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