鳄蜥的两性异形  

Sexual dimorphism of Shinisaurus crocodilurus

作　　者：何南[1] 武正军[1] 蔡凤金[1] 王振兴[1] 于海 黄乘明[1,3] 

机构地区：[1]广西师范大学生命科学学院珍稀濒危动植物生态与环境保护省部共建教育部重点实验室,广西桂林541004 [2]广东罗坑省级自然保护区,广东韶关512100 [3]中国科学院动物研究所,北京100101

出　　处：《生态学杂志》2011年第1期7-11,共5页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30760039;31060288);教育部重点项目(209093);广东省林业科技创新专项(2008KJCX013);德国动物物种和种群保护协会(ZGAP)项目;广西研究生教育创新项目(2009106020710M55)资助

摘　　要：通过比较鳄蜥的体型与头部大小等特征的差异,研究了鳄蜥的两性异形情况。结果表明:性成熟鳄蜥个体体色差异显著,成年雄性头胸部腹面呈鲜红色或浅蓝色,而雌性为浅黄色或淡红色;成年雄性头部显著大于成年雌性(头长(HL),P<0.001;头宽(HW),P<0.001),成年雌性腹部长(AL)显著大于成年雄性(P=0.018);而成年雄性和成年雌性的体长(SVL)以及尾长(TL)差异不显著(SVL,P=0.193;TL,P=0.22);亚成体头长随体长的增长速率显著大于成年雌性(P=0.021),而亚成体头宽与成年雌性头宽差异不显著(P=0.545);亚成体头部与成年雄性头部呈同速增长(HL,P=0.252;HW,P=0.441)。特定SVL时,亚成体头宽显著大于成年雌性头宽(P<0.001);亚成体头长显著大于成年雄性头长(P<0.001),但亚成体头宽与成年雄性头宽差异不显著(P>0.05)。研究结果表明鳄蜥存在局部两性异形。Through comparing the body size and head size among juveniles and female and male adults, the sexual dimorphism of Shinisaurus crocodilurus was studied. There was a significant difference in the ventral color of head and breast between the adults, i. e. , vivid red or light blue for the males, and light yellow or light red for the females. The head size （including head width （HW） and head length （HL） ） of the males were significantly larger than those of the females （ HL, P〈0. 001 ; HW, P〈0. 001 ）, and the abdomen length （AL） of the males was significantly shorter than that of the females （P = 0. 018 ）. However, the snout-vent length （SVL） and tail length （TL） between the males and females were not significantly different （for SVL, P=0. 193; for TL, P = 0.22）. The increasing rate of HL with SVL for the juveniles was higher than that for the female adults （P=0. 021 ）, whereas the HW was not significantly different between the juveniles and female adults （P = 0. 545 ）. The head size of both the juveniles and the male adults increased with SVL at the same rate （for HL, P=0. 252; for HW, P=0. 441）. When the SVL was kept constant, the HW of the juveniles was larger than that of the female adults （P 〈 0. 001 ）, and the HL of the juveniles was larger than that of the male adults （P〈0. 001 ）, but the difference of HW between the juveniles and the male adults was not significant （ P〉0. 05 ）. The results indicated that partial sexual dimorphism existed in S. crocodilurus.

关 键 词：鳄蜥 两性异形 性选择 繁殖压力 

分 类 号：Q958.1[生物学—动物学]