Биология размножения большого песочника, Calidris tenuirostris

Томкович, П.С.

Автор: Томкович П.С.
Журнал: Бюллетень Московского общества испытателей природы. Отдел биологический
Том: 106
Номер: 4
Год издания: 2001
Издательство: Изд-во Моск. ун-та
Местоположение издательства: М.
Первая страница: 13
Последняя страница: 22
Аннотация: According to studies on a spur of Schuchy Range, the upper Anadyr River, inland Cukotka (64°55' N; 168°35' E) in 1993-1995 the Great Knot is an alpine and subalpine species. Birds feed, nest and attend young on level mountain tops, plateaux, some broad terraces preferably on lichen tundra with partly unvegetated rock fields and/or stony soil (table 1), often among scattered bushes and larch trees. Breeding density varied between 4.7-10.3 territorial males per 1 sq. km with 13-25% of males being unmated (table 2). Great Knots are among the earliest wader arrivals, and they start nesting in late May (table 3), earlier than any other wader species in the area. Вreeding events are rather prolonged: laying of four eggs takes 5 days, incubation – 22.56 days (SD = 0.59; n = 4), development of chicks to fledging – 20.35 days (SD = 2.07; n = 22). The total mass of a clutch of four fresh eggs is equal to 53,95% (SD = 3,91%, n = 6) of the female body mass laid the clutch. Hatching period covers 17-19 days in late June and early July with median dates felling on late June (figure 1). Replacement clutches are unusual. Numbers of rodents were increasing in 1993-1995, being responsible for rather good nesting success (53,1 * 1,8% SE) and rising in average 1.4, 0.9-1.0, and 1.4-1.6 fledgelings per a breeding pair, respectively in the years. Such productivity was estimated being with a surplus for positive balance in the population.
Добавил в систему: Томкович Павел Станиславович

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