期刊
BIOLOGICAL INVASIONS
卷 12, 期 7, 页码 2219-2231出版社
SPRINGER
DOI: 10.1007/s10530-009-9632-z
关键词
Ecological niche; Distribution modelling; Lateral hydrological connectivity; Light availability; Restoration; French Upper-Rhone River
资金
- Compagnie Nationale du Rhone
- Agence de l'Eau Rhone-Mediterranee et Corse
- Direction Regionale de l'Environnement
- Region Rhone-Alpes
- Centre en Sciences Naturelles de l'Environnement of the University of Geneva
Floodplains are simultaneously among the most species-rich and the most threatened ecosystems. Alien aquatic macroinvertebrates contribute to this threat but remain scarcely studied in the lateral dimension of floodplains. We modelled the realized ecological niches of the alien species occurring in 24 floodplain channels of the Rhne River. Environmental variables depicting the ecological niches were associated to the lateral hydrological connectivity and light availability, both being modified during floodplain restoration works. Eight alien species were observed and they demonstrated either ubiquity or a restricted niche, with no link to the date of introduction. For most of them, the main river channel appeared as an important dispersal route in the lateral dimension of the floodplain. An increase of both lateral connectivity and light availability favoured most of the modelled species. Consequently, we recommend that sector-scale restoration programmes preserve varying levels of lateral connectivity for floodplain channels to prevent the expansion of alien aquatic macroinvertebrates.
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