关键词: 扩散行为, 婚配制度, 标记重捕, 扁颅蝠

Abstract: We investigated offspring dispersal in the lesser flat-headed bat,Tylonycteris pachypus (Chiroptera:Vespertilionidae)in both Longzhou and Ningming counties,Guangxi,China,from 2002 to 2007,by marking and recapturing. A total of 669 individuals (316 adults and 353 juveniles,293 males and 376 females)were marked,and 139 of them (20. 8% )were subsequently recaptured. The results showed that both male and female offspring dispersed away from their natal roosts before maturity. The dispersal rates of juvenile males
(82. 2% )and juvenile females (66.7% )were not significantly different (P > 0.05). The dispersal rates of adult males (76.5% )and adult females (58.5% ,P > 0. 05),also were not significantly different,but when we combined the data from adults and juveniles,the dispersal rate for males (80.7% )was higher than that for females (62.3% ,P < 0.01). In addition,we found that juvenile males dispersed farther than did same-aged females (males:787. 5 ± 26.980 m,n = 37;females:517. 4 ± 25.308 m,n = 24;P < 0. 01). Among 61 dispersing offspring,only one male (0.7% )dispersed from one natal bamboo forest to another,while most dispersed within their natal bamboo forest.

Key words: Dispersal behaviour, Marking and recapturing, Mating system, Tylonycteris pachypus