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作 者:姚冲学 和荣华 黄元 吕婷 王智红 梁良 肖剑 陈明勇[1] YAO Chongxue;HE Ronghua;HUANG Yuan;LYU Ting;WANG Zhihong;LIANG Liang;XIAO Jian;CHEN Mingyong(College of Life Sciences,Yunnan University,Kunming 650091,China;Yulong Snow Mountain Provincial Nature Reserve Administrative Bureau,Lijiang,Yunnan Province 674100,China)
机构地区:[1]云南大学生命科学学院,昆明650091 [2]云南玉龙雪山省级自然保护区管护局,云南丽江674100
出 处:《四川动物》2019年第6期666-671,共6页Sichuan Journal of Zoology
基 金:生态环境部(原环境保护部)生物多样性保护专项:2018年两栖动物观测(云南玉龙雪山观测样区)
摘 要:分别测量于2018年6—8月采自云南丽江玉龙雪山的32只(17♂,15♀)红瘰疣螈Tylototriton shanjing成体的全长、头体长、头长等13项形态特征指标,并检验该物种的两性异形。结果表明:雌性平均全长为160.72 mm±3.02 mm(n=15),雄性平均全长为138.58 mm±2.57 mm(n=17),雌性与雄性平均全长比为1.160,两性异形指数为0.138,属雌性大于雄性的两栖类;全长在两性间的差异有统计学意义;除了雌性的头宽、尾宽、尾高和腋至胯距外,其他形态特征与全长均有显著或极显著相关性;以全长为协变量的协方差分析结果显示,红瘰疣螈的头体长、头长、吻长、尾长和前肢长在两性间的差异有统计学意义;雌性的尾长和前肢长随全长的生长速率大于雄性,而头体长、头长和吻长随全长的生长速率小于雄性。生育力选择假说能解释红瘰疣螈玉龙雪山种群的两性异形现象。From June to August in 2018,sexual dimorphism of Tylototriton shanjing was studied on 32 adults(17♂,15♀)collected from the Yulong Snow Mountain in Lijiang,Yunnan province.A total of 13 morphological characteristics,such as the total length,head-body length,head length,etc.and the sexual dimorphism of this species was examined.The results showed that the average total length of females was 160.72 mm±3.02 mm(n=15),while the males was 138.58 mm±2.57 mm(n=17).The average total length ratio of female and male was 1.160,and the heterosexual index was 0.138,indicating that the females were larger than the males.According to the independent sample t test results,T.shanjing had a significant difference in total length between sexes.The results of correlation test showed that all the other morphological characteristics were significantly correlated with total length,except head width,tail width,tail height and space between axilla and groin in females.Using total length as the covariant,the covariance analysis results showed that,the 5 morphological characteristics of T.shanjing such as head-body length,head length,snout length,tail length and the length of foreleg were significantly different between sexes.The results of unary linear regression showed that the growth rates of tail length and the length of foreleg of females were higher than males,while the head-body length,head length and snout length of females were smaller than males.In conclusion,the sexual dimorphism of T.shanjing Yulong Snow Mountain population can be explained by the fertility selection hypothesis.
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