| Titre : | Populations and breeding performance of divers, geese and ducks at Zackenberg, northeast Greenland, 1995-2005 |
| Auteurs : | Hans Meltofte, Auteur |
| Type de document : | Article |
| Dans : | Wildfowl (56 2006) |
| Article en page(s) : | 129-151 |
| Langues: | Anglais |
| Résumé : | Monitoring at Zackenberg (74 degrees 30'N, 20 degrees 30'W) since 1995 has provided for the first time long-term data on population trends and breeding performance for a number of high-arctic waterbird species in Greenland. Breeding populations of Red-throated Diver Gavia stellata and Long-tailed Duck Clangulahyemalis were relative stable from year to year, whereas breeding success varied with the abundance of Arctic Fox Alopex, lagopus and Collared Lemming Dicrostonyx groenlandicus. Average nest survival in Red-throated Diver was 18% between 1996 and 2005, and at least five pairs produced a total of about 29 potentially fledged young, or at least 0.5 per pair per year-most of them in two years with few Arctic Foxes. Long-tailed Duck bred successfully in only one year, a year with many Arctic Foxes but also much alternative prey in the form of Collared Lemmings. Few pairs of King Eider Somateria spectabilis were found, and these had poor breeding success. Between four and 32 pairs of Barnacle Geese Branta leucopsis brought their goslings into the study area from nearby colonies each year. An average of about 0.6% of the goslings disappeared per day during the fledging period. More than 500 immature Icelandic Pink-footed Geese Anser brachyrhynchus moulted in the study area at the beginning of the study period, but most disappeared after a few years in spite of attempts to protect them from human disturbance. There is some indication that numbers of both Pink-footed Goose and Long-tailed Duck at Zackenberg have declined since the 1960s. |
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