Seasonal decline in health status of Great Tit (Parus major) nestlings

被引:39
|
作者
Dubiec, A [1 ]
Cichoñ, M [1 ]
机构
[1] Jagiellonian Univ, Inst Environm Sci, PL-30387 Krakow, Poland
关键词
D O I
10.1139/cjz-79-10-1829
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Seasonal variation in offspring survival and recruitment rates in birds may be mediated by immune function, as it defines the ability of individuals to protect themselves against parasites and infectious diseases. To investigate the relationship between hatching date and health status of Great Tit (Parus major) nestlings, two blood parameters (leukocyte level and haematocrit) were estimated. Leukocyte level decreased as the season progressed within first but not second broods, while haematocrit showed no seasonal variation within either brood type. However, nestlings from first broods had both higher leukocyte levels and higher haematocrit than nestlings from second broods. Nestling body condition (defined as the residual of body mass on tarsus length calculated from linear regression) was not related to hatching date within brood type, while a significant difference between brood types was found. We suggest that the commonly observed decline in juvenile survival rate as the season progresses may be at least partly attributed to seasonal changes in health status.
引用
收藏
页码:1829 / 1833
页数:5
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