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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 34, No. 5, 2013, pp. 453-458
Bioline Code: zr13070
Full paper language: English
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 34, No. 5, 2013, pp. 453-458

 en Population trends and behavioral observations of wintering common cranes ( Grus grus check for this species in other resources ) in Yancheng Nature Reserve
LI, Zhong-Qiu; WANG, Zhi & GE, Chen

Abstract

To understand the population status and behavioural features of wintering common cranes in the Yancheng Nature Reserve, two transects were established and population trends were monitored every month over five recent winters from 2008 to 2013. Wintering behaviours were also observed in order to explore the possible effects of family size and age on time budgets. Results indicated that the populations were stable with a range of 303 to 707 individuals. Negative effects of coastal developments were not found on the wintering population of common cranes, which might be related to their diets and preference for artificial wetland habitats. We found a significant effect of age on time budgets, with juveniles spending more time feeding and less time alerting, which might be related to the needs of body development and skill learning. Family size did not affect the time budgets of the cranes, which indicated that adults did not increase vigilance investment even when raising a larger family.

Keywords
Grus grus; Population; Feeding; Vigilance; Age; Group size effect; Family group

 
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