Social organization of Sanderlings breeding at Northern Taimyr, Siberia

Tomkovich, P.S.; Soloviev, M.Y.

Авторы: Tomkovich P.S., Soloviev M.Yu
Журнал: Орнитология
Том: 29
Год издания: 2001
Первая страница: 125
Последняя страница: 136
Аннотация: According to studies, carried out in 1990-1992 in the Knipovich Bay area, Northern Taimyr, a sufficient portion of the Sanderling, Calidris alba, population arrive to the breeding grounds already paired. Patterns of spacing behavior change during a season in accordance with needs of birds at each stage of breeding. The resource defending territoriality was not found, and spacing behavior is probably similar in different species populations. 18% of 22 nests were incubated by both parents, while others were attended by single birds, either males or females. Only single birds cared for young. More males were recorded attending broods from early clutches, while females predominated among birds, caring for young from late clutches. Together with other facts this indicates the use of double-clutch breeding system by part of the Taimyr Sanderling population, though no direct evidence was found. A delay in start of incubation of clutches attendant by males was not found in the Taimyr Sanderling, in contrast with Canadian Sanderlings and the Little Stint, Calidris minuta. Only 1/3 of the population or less, most probably less than 20% of birds, attempted to mate twice a season. Thus the breeding system of Sanderling has differences not only between Canada and Taimyr, but also between Taimyr and Greenland, where monogamy is typical. No benefits of double-clutching were found in this study, as chances of late broods to survive were poor. The polymorphism in mate relations, found in Taimyr Sanderling, can be advantageous, allowing evolution in any necessary direction at further environmental changes.
Добавил в систему: Томкович Павел Станиславович

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