Sexual differences in bite force are not related to testosterone level in the wild-derived red junglefowl  

作　　者：Xiaodong Rao Daiping Wang Wei Liang 

机构地区：[1]School of Tropical Agriculture and Forestry,58 Renmin Avenue,Meilan District,Hainan University,Haikou 570228,China [2]Intelligent Forestry Key Laboratory of Haikou City,College of Forestry,58 Remin Avenue,Meilan District,Hainan University,Haikou 570228,China [3]Key Laboratory of Animal Ecology and Conservation Biology,No.1,Beichen West Road,Chaoyang District,Institute of Zoology,Chinese Academy of Sciences,Beijing 100101,China [4]Ministry of Education Key Laboratory for Ecology of Tropical Islands,Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province,99 south Longkun Road,Qiongshan District,College of Life Sciences,Hainan Normal University,Haikou 571158,China

出　　处：《Current Zoology》2025年第1期33-39,共7页动物学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(no.31800320 and no.32360250 to XR);Natural Science Foundation of Hainan Province(no.320RC506 to XR);funded by the project supported by the Scientific Research start-up Fund of Hainan University[no.KYQD(ZR)20057];the Teaching Research of Hainan University(no.Hdsz20-9);supported by Hainan Tropical Rainforest Conservation Research Project,ZDYF2023RDYL01(supported by the Hainan Institute of National Park,HINP,KY-24ZK02);supported by the specific research fund of The Innovation Platform for Academicians of Hainan Province.

摘　　要：Bite force is an important performance indicator of individual fitness that is closely related to food acquisition,male competition,and mating selection.It is also affected by a variety of factors and different mechanisms.Therefore,it is relatively difficult to understand the evolutionary driving forces of changes in bite force.In this study,the driving factors affecting the bite force of wild-derived red junglefowl(Gallus gallus jabouillei)were investigated from the aspects of morphological indicators and physiological characteristics.Results showed that the bite force of wild-derived red junglefowl was directly related to sex,showing obvious sexual differences.However,there was no correlation between the plasma testosterone level and bite force.The bite force of males was significantly greater than that of females,and the body index(i.e.,PC1 of five body measures,namely body mass,body length,wing length,tail length,and tarsus length),the grasp index(i.e.,tomial length×bill width)of males were significantly greater than those of females.Sexual selection may have played a key role in the evolution of bite force in the red junglefowl.Future studies should examine other key factors affecting changes in bite force to verify the correlation between secondary sexual characteristics and bite force in red junglefowls.

关 键 词：bite force evolution morphometric indices red junglefowl TESTOSTERONE 

分 类 号：TS8[轻工技术与工程]