Journal of Guangxi Normal University(Natural Science Edition) ›› 2021, Vol. 39 ›› Issue (1): 71-78.doi: 10.16088/j.issn.1001-6600.2020032202

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Daily Activity Patterns of Two Sympatric Squirrels Callosciurus erythraeus and Dremomys rufigenis in Nonggang, Guangxi, China

LI Youbang1,2,3*, NONG Juanli1, YANG Wanlin1, ZHAO Jiajia1, ZHU Qiqi1   

  1. 1. College of Life Sciences, Guangxi Normal University, Guilin Guangxi 541006, China;
    2. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006, China;
    3. Guangxi Key Laboratory of Rare and Endangered Animal Ecology (Guangxi Normal University), Guilin Guangxi 541006, China
  • Received:2020-03-22 Revised:2020-06-20 Online:2021-01-25 Published:2021-03-27

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Abstract: Activity patterns can importantly indicate the utilization resources over time. Studies on activity patterns divergence of sympatric animals shed light on their coexistence mechanism. Activities of two sympatric squirrels Callosciurus erythraeus and Dremomys rufigenis in Guangxi Nonggang National Nature Reserve were studied via camera-trapping during the period from September 2015 to October 2016. Results showed that the time niche breadth index calculated by Shannon-Wiener index of C. erythraeus and D. rufigenis were 0.845 1 and 0.803 6, respectively. Both species of squirrels were diurnal preference animals. Single independent photographs of the two squirrels obtained in different time period varied significantly (C. erythraeus: t=5.12, df=23, P<0.001; D. rufigenis: t=4.60, df=23, P<0.001). There was significant variation in pictures of the two squirrels taken in different time period (Z=-2.21, P=0.03). Activity overlap indicated by kernel density estimation was 0.839 2, and the activity patterns differed significantly from each other (P<0.001) suggesting that the two squirrel species staggered their activity time. It seemed that the two sympatric squirrels species adopt an ecological strategy by diverging their activity to relieve competition, thus to coexist in the same habitat.

Key words: camera-trapping, red-bellied tree squirrel, Asian red-cheeked squirrel, activity pattern, kernel density estimation, niche separation, karst limestone habitat

CLC Number: 

  • Q958.122
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