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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population densities of breeding birds in Jameson Land, East Greenland, 1984-1988
Auteurs :	Christian Ebbe Mortensen, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (94(1) 2000)
Article en page(s) :	29-41
Langues:	Anglais
Résumé :	Breeding birds were censused and mapped in six study areas in Jameson Land, East Greenland, in 1984, 1987 and 1988 (Fig. 2). The detailed distributions and habitat preferences appear from Fig. 3-7. There is a general decrease in precipitation and snow cover from south to north in high-arctic Northeast Greenland. Snow cover in early June is close to 100% in the southern part, but less than 10% in the nothernmost areas. Correspondingly, there is a decrease in vegetation cover from 80-90% in the south, and a vegetation mosaic covering 30-60% in the central high arctic, to only a few percent coverage in the north. Jameson Land is relatively luxuriant with a vegetation cover of mostly 90-95%. The widespread, continuous dwarf scrub vegetation in the area constitutes a dense vegetation structure which appears to be a suboptimal habitat for wader species such as Ringed Plover, Sanderling, Dunlin, Turnstone and, to a certain extent, Knot, resulting in lower population densities than might be expected, considering the luxuriant conditions. Wader population densities from the six study areas (Table 1a) were compared with results from similar studies in 30 other study areas in high-arctic Greenland and Ellesmere Island, and the relationship was analysed between wader densities and vegetation and snow cover as well as the coverage of snow-free vegetation by 10 June (when the birds initiate breeding), according to Meltofte (1985) (Table 2). Wader densities show a general, positive association with percentage snow-free vegetation (significant for Knot, Dunlin and Turnstone) and, except for Knot, a negative association with snow cover (significant for Turnstone). Stronger correlations might emerge if details of the vegetation and its suitability as a breeding habitat for the different species were included in the analysis. The present study in Jameson Land supports the conclusion of Meltofte (1985), that the most attractive breeding conditions for waders in Northeast Greenland prevail in the central part, combining a moderate amount of snowfall and a relatively early snow melting with a mosaic of bare ground and vegetated areas.

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