We live-trapped two Niviventer confucianus populations from March to November of 2010 in Thousand Island Lake region using the capture-mark-recapture (CMR) method. We used Jolly-Seber method, modified Lincoln index method, Schnabel method and minimum number of animals alive (MNA) method to estimate population sizes of Niviventer confucianus, and discussed the applicability of these estimators in white-bellied rats on land-bridge island. Our results showed that there was no significant difference between Jolly-Seber method and modified Lincoln index method. We considered that modified Lincoln index method was more suitable for estimating the population quantity of Niviventer confucianus in the land-bridge island. The study can provide basic data for the future study of population ecology of rodent in the land-bridge island.
Chinese white鄄bellied rats, Niviventer confucianus, were mark鄄recaptured from July to November, 2009 and from March to November, 2010 on two islands of the Thousand Island Lake region. The maximum movement distances of Chinese white鄄bellied rats that were recaptured 4 or more times were calculated in spring, summer and autumn by Biotas 2. 0. Then we used independent sample T test, one鄄way ANOVA or Mann鄄Whitney U test to analyze the effects of age, sex and season on the maximum movement distance. We aim to explore movement and home range of Chinese white鄄bellied rats in isolated island environment, and to predict its behavioral responses to isolated island environment. The results showed that there was no significant difference in the maximum movement distance between two islands, and the data of the two islands could be pooled. There were highly significant differences in the maximum movement distance among four different age groups. The maximum movement distance of males was significantly longer than females in adults, but did not differ between the sexes in any other age groups. The maximum movement distance differed significantly among spring, summer and autumn in sub鄄 adults, but not in other age groups. The maximum movement distance of both males and females was longest in autumn and shortest in spring. Our results indicate that the maximum movement distance is positively correlated with the age of Chinese white鄄bellied rats, and is significantly longer in males than females. Our results were inconsistent with some of the previous studies on home range size in rats. This inconsistency likely reflects the restriction of resources in isolated island
Island is a special kind of fence for rodent populations on islands. Island rodents may face increased risk of inbreeding and population decline due to isolation among islands and mainland. We investigated the population genetics of Chinese white-bellied rat (Niviventer confucianus) populations on 13 islands in the Thousand Island Lake region in 2008.
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