In the nominotypical subspecies of the citrine wagtail, M. c. citreola Pall., the density of nesting pairs in the northern part of its range in the central Yamal Peninsula reaches a peak in the moss-lichen tundra subzone, while similar biotopes (moist herb-moss willow scrub) are also present in the forest-tundra and shrub tundras. It is suggested that one of the causes of such an unusual distribution is that the birds feed on tipulid larvae, which dominate by biomass among invertebrates in moist moss-lichen tundras. The species is capable of successful existence in the northern Subarctic because of the brevity of its post-nesting period, determined by the endogenous control of the age at the onset of postjuvenal molt, rapid molting during the polar day, partial postnuptial molt, and early development of the migratory state, which provides for early departure.
Russian Journal of Ecology – Springer Journals
Published: Mar 27, 2012
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