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. To cite this article: M.-C. Eybert et al., C. R. Biologies 326 (2003).
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