The Life Cycle and Number Dynamics of the Urban Mallard Population (Anas platyrhynchos, Anseriformes, Aves) in Moscowстатья
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Дата последнего поиска статьи во внешних источниках: 7 сентября 2017 г.
Аннотация:The urban mallards’ population monitoring in Moscow for 18 years has identified the main transformations of its life cycle, that enable it to increase the number and to overcome the challenges of recent urbanization successfully. The increasing of wintering ducks number leads to arising of the nesting ones. The offset of the sustainable warm period to the beginning of the year and the growth of the natural and artificial light starts the early reproductive period of a wide range of females. The nesting period is extended due to frequent destruction of nests and the increasing of the re-nesting females number. The clutches and broods loss is inevitable in the city. The increasing of the nesting females number affects the mortality of younger ducklings. These compensatory and regulatory phenomena lead to a more rational using of resources and to the further population growth. At the end of the breeding season mallards’ number increases as a result of the reproduction. In turn, the size of wintering flocks affects the number of breeding females in the next season. There is a positive feedback of the size of wintering and breeding groups at the present stage of the population dynamics.