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| Comparisons of echolocation calls and wing morphology among six sympatric bat species |
| WEI Li,GAN Yuman,LI Zhouquan,LIN Zhihua,HONG Tiyu,ZHANG Libiao |
| School of Chemistry and Life Science,Lishui University,Lishui 323000,China) |
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Abstract During May to August 2006,we studied the echolocation calls and wing morphology of six sympatric species ofbats which belong to Hipposideridae and Vespertilionidae in Qixing Cave, Guilin City Hipposideros pratti produces short CF/ FM calls which mainly contain three harmonics, and has high wing loading,low aspect ratio and average wing tip shape index. H. armiger produces single CF/ FM calls, and has high wing loading, low aspect ratio and average wing tip shape index H. larvatus produces single CF/ FM calls, and has average wing loading, low aspect ratio and average wing tip shape index. Myotis siligorensis produces long bandwidth calls that are usually single FM sweep, being the smallest of these bat species with low wing loading, low aspect ratio and average wing tip shape index. M. ricketti produces single FM calls, and has average wing loading, low aspect ratio and high wing tip shape index. Nyctalus plancyi produces three harmonics short FM calls, and has high wing loading, average aspect ratio and low wing tip shape index. Most morphological and call parameters among these six bat species were significantly different (P < 0. 05) with One-Way ANOVA method. These results indicated that these six sympatric bat species were highly adapted to different foraging strategies and habitats which was also correlated with the significant differentiation of species-specific echolocation calls and external morphological characteristics. The present work demonstrated that niche partitioning occurred among these six bat species, which leads to decreases in the pressure of interspecies competition. Therefore, niche partitioning was the key mechanism for coexistence of these bat’s community.
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