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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 25, No. 3, 2004, pp. 198-204
Bioline Code: zr04036
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 25, No. 3, 2004, pp. 198-204

 en Nest-site Selection and Competition Coexistence of Horned Larks and Small Skylarks
ZHAO Liang ZHANG Xiao-ai

Abstract

We investigated nest-site characteristics and reproductive season changes of horned larks ( Eremophila alpestris check for this species in other resources ) and small skylarks ( Alauda gulgula check for this species in other resources ) during three periods from Apr.to Sep.in 2000-2002 at Haibei Alpine Meadow Ecosystem Research Station,the Chinese Academy of Sciences,in northern Qinghai Province.Nests of horned lark (n=27) and small skylark (n=43) were used to eximined nest-site characteristics.We used stable isotopes to determine the dietary contributions ratio of raise nestling,and compare nest-site characteristics and overlap degree of diet of horned lark and small skylark.The result shown:1)there was significantly difference between the exoteric degrees of nests in horned lark and small skylark (P<0.01),which were 92.16% and 34.61%,respectively.2)the number of distance to nearest structural element of horned lark (0.07±0.26) was significantly lower than that of small skylark (2.57±1.19)(P<0.01).3)the vegetation height and the percentage of vegetation cover of nest-site of small skylark were significantly higher than those of horned lark(P<0.01).4)the food resource,reproductive season length and reproductive frequency largely overlapped in these two species.There is a balance between cost and benefit of horned lark and small skylark in nest-site selection.It is possible that predation and thermal consideration have guided the evolution of nest-site selection of two species,and the coexistence mechanism of them is nest-site differentiation.

Keywords
Eremophila alpestris; Alauda gulgula; Nest-site selection; Nest predation; Thermal consideration;Competition; Coexistence

 
© Copyright 2004 Kunming Institute of Zoology, the Chinese Academy of Sciences
Alternative site location: http://www.zoores.ac.cn/

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