О своеобразии популяции тулеса на острове Врангеля

Томкович, П.С.; Дондуа, А.Г.

Авторы: Томкович П.С., Дондуа А.Г.
Журнал: Орнитология
Номер: 36
Год издания: 2011
Первая страница: 103
Последняя страница: 113
Аннотация: Fieldwork in summer of 2007 demonstrated that the density of Grey Plovers breeding at a 4.69 km2 study plot on the uplands of north-central Wrangel Island was 3.62 nests/km2 (Fig. 1), which is among the high estestimates for the species. Broods left their nests between 6 and 24 July (Fig. 2), i.e. within the known limits for the island, but possibly slightly earlier than in most other seasons according to data of Stishov (in Stishov et al., 1991). 17.2% of eggs were unviable (1–4 in a clutch); further study is needed to confirm whether such a high infertility rate is an exception or a regular phenomenon. Although we cannot demonstrate this statistically, Wrangel Island Grey Plovers seem to be much more cautious as comp ared to other pop ulations , which may be an adaptation to cons tantly high dens ities of Arctic Foxes on the island. Measurements of adults (Table 2) con firmed formerly revealed (Po rtenko, 1972; Byrkjedal, Thompson , 1998; Eng elmo er, Ros elaar, 1998) peculiarity of ins ular birds, which is sho wn by their long wings . At the same time sho rt bills and sho rt tarsi in the pop ulation are no t con firmed in this study. Several iss ues in the Grey Plov er eco log y on the island that deserve further research are identified.
Добавил в систему: Томкович Павел Станиславович

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О своеобразии популяции тулеса на острове Врангелястатья

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