摘要
两性异形是指在同一种群内,雌雄间的形态特征产生分化,如在个体大小、局部形态构造、体色等方面呈现出差异的现象。为了解西藏黑斑原(Glyptosternum maculatum)雌雄间是否也存在两性异形,在其繁殖期对性成熟个体进行了形态学测量及相关分析。结果表明:西藏黑斑原繁殖群体间存在显著的雌雄异形,一是雄性个体的体长、体重及特定体长下的尾长显著大于雌性个体;二是在特定体长下,雌性个体眼径、体高、躯干长以及背鳍、胸鳍、腹鳍、臀鳍、尾鳍长度均显著大于雄性。16个形态参数的主成分分析表明,雌雄间的差异主要是由体型特征(包括身体各部分长度、各鳍长度等)及头部形态特征引起的,贡献率达76.7%。对全长-体重方程中异速生长指数b的t检验表明,繁殖期黑斑原雌性个体呈等速生长而雄性个体呈异速生长。
Sexual dimorphism refers to the morphological differentiation between males and females in the same population,such as sizes,morphological features,and colors.Cold water fish Glyptosternum maculatum,is an endemic teleost species of notable economic importance and with high potential for controlled rearing of the species in Tibet Autonomous Region.In this study,morphological measurements and related analysis were conducted on sexually mature G.maculatum to investigate their morphological differences in Tibet Autonomous Region.Results indicated the sexually mature populations indeed display really displayed significant sexual dimorphism:males exhibited significantly greater body length,weight,and males also exhibited in addition to greater tail length while females exhibited significantly greater eye diameter,body depth,trunk length,and lengths of dorsal,pectoral,pelvic,anal,and caudal fins at a given body length.Principal components analysis on 16 morphological parameters showed that the differences were largely due to features of the body shape(including lengths of body parts and fins)and the head,and differences in the above features differences contributed 76.7%.The t-statistic test on the allometry index b in the total lengthweight function showed that during the breeding season,the total lengths and weights of G.maculatum females developed proportionally,while the male specimens were allometrical.
作者
潘瑛子
刘海平
周建设
陈美群
PAN Ying-Zi;LIU Hai-Ping;ZHOU Jian-She;CHEN Mei-Qun(Institute of Fishery Sciences,Tibet Academy of Agricultural and Animal Husbandry Sciences,Lhasa 850032,China)
出处
《水生生物学报》
CAS
CSCD
北大核心
2018年第6期1203-1209,共7页
Acta Hydrobiologica Sinica
基金
Supported by the Special Finance of Tibet Autonomous Region(2017CZZX003,2017CZZX004 and XZNKY-2018-C-040)。
关键词
黑斑原
形态特征
两性异性
Glyptosternum maculatum
Morphological features
Sexual dimorphism