http://reply.papertrans.cn/1/34/3312/3312-31.png
http://reply.papertrans.cn/1/34/3312/3312-32.png
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http://reply.papertrans.cn/1/34/3312/3312-35.png
Submitted on: 03 September 2015.
Revised on: 08 November 2015.
Accepted on: 27 December 2015.
___________________BEHAVIORAL ECOLOGY---OXFORD UNIV PRESS INC