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Winter Mortality and Food Supply in Tits Parus spp.

Christer Jansson, Jan Ekman and Anders von Brömssen
Oikos
Vol. 37, No. 3 (Dec., 1981), pp. 313-322
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544122
Stable URL: http://www.jstor.org/stable/3544122
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Winter Mortality and Food Supply in Tits Parus spp.
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Abstract

Changes in survival and immigration in response to food provision in autumn and winter were studied in colour-banded populations of willow tits Parus montanus and crested tits P. cristatus. The extra food improved winter survival substantially and induced autumn immigration and settling. Food influenced survival, at least partly, by decreasing the risk of predation. Improved winter survival of the fed populations led to doubled breeding populations in the following spring, although the extra food was withdrawn two to four weeks before laying. It is concluded that in these tits, food abundance is crucial to winter survival, which limits the size of the breeding population. /// Колебания выживаемости и иммиграция в зависимости от запаса пищи осенью и зимой исследованы исследованы у подуляций буроголовых синиц Parus montanus и си-ниц P. cristatus. Избыток пищи способствует выживаемости и стимулирует осеннюю иммигацию и заселение участков зимовки. Пища влияет на выживае-мость, хотя бы частично, путем снижения возможности хищничества. Повы-шенная зимняя выживаемость выкармливаемых популяций приводит к удвоению популяции при размножении весной, хотя пишу убирали за 2-4 недели перед откладкой яиц. Сделано заключение, что у этих синиц обилие пищи - решаю-щий фактор выживаемости в зимний период, ограничивакщий размеры размно-жакщейся популяции.

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