Shorebird community variations indicative of a general perturbation in the Mont-Saint-Michel bay (France) |
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Authors: | Eybert Marie-Christine Geslin Thomas Questiau Sophie Feunteun Eric |
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Affiliation: | UMR Ecobio 6553, Avenue du Général Leclerc, 35042 Rennes, France. marie-christine.eybert@univ-rennes1.fr |
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Abstract: | The Mont-Saint-Michel bay located on the East Atlantic Flyway is the first site in France for wintering shorebirds, with, on average, 53,000 individuals in January. Seven species represent 96% of that community: dunlin (Calidris alpina), knot (Calidris canutus), oystercatcher (Haematopus ostralegus), curlew (Numenius arquata), grey plover (Pluvialis squatarola), bar-tailed godwit (Limosa lapponica) and black-tailed godwit (Limosa limosa). The international bird census organised by Wetlands International in mid-January gave us the opportunity to study, for a 23 years period, population variations in the bay. Despite a quite good carrying capacity, we showed that the decreasing proportion of 4 species in the bay relative to the other French populations may indicate a general perturbation of the bay. We discuss the different hypotheses to explain that observation. |
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