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COLONISATION D'UN ECOSYSTEME D'EAU DOUCE HETEROGENE PAR UN OISEAU D'EAU HERBIVORE : LE CYGNE TUBERCULE (CYGNUS OLOR) DANS LES ETANGS PISCICOLES DE DOMBES.

Abstract : In some cases, wetland colonization by animals and plants may be a major threat to biodiversity. It is therefore crucial to better understand the ecology of colonizing species to assess their relationships with the other elements of ecosystems. We studied the consequences of the relatively recent colonization of French fishponds by mute swan (Cygnus olor). We especially considered how such colonization now translates into space, through the analysis of habitat selection processes. Our results show that swan distribution within a fishpond landscape depends on fishpond spatial configuration (area - isolation), available resources as well as mute swan breeding status. We then analysed the relationships between mute swan and fishpond animal and plant communities. Where swan pair settle, we do not demonstrate any effect of swan presence on the abundance of other waterbirds, nor any spatial exclusion within fishponds. Conversely, mute swans can significantly deplete aquatic macrophyte beds, suggesting cascade effects on other fishpond communities are possible. Like any perturbation caused by a colonizing species, that associated with swan arrival however has to be considered in the broader context of perturbation regimes onto the ecosystem. This is especially crucial in ecosystems like fishponds, that are so much dependent upon human activity.
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https://tel.archives-ouvertes.fr/tel-00723066
Contributor : Guillaume Gayet Connect in order to contact the contributor
Submitted on : Tuesday, August 7, 2012 - 1:43:52 PM
Last modification on : Tuesday, August 2, 2022 - 3:50:29 AM
Long-term archiving on: : Friday, March 31, 2017 - 11:47:45 AM

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Guillaume Gayet. COLONISATION D'UN ECOSYSTEME D'EAU DOUCE HETEROGENE PAR UN OISEAU D'EAU HERBIVORE : LE CYGNE TUBERCULE (CYGNUS OLOR) DANS LES ETANGS PISCICOLES DE DOMBES.. Sciences de l'environnement. Université Montpellier II - Sciences et Techniques du Languedoc; Université Montpellier I, 2010. Français. ⟨tel-00723066⟩

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