嘉陵江下游蛇鮈的两性异形与雌性个体生殖力

doi:10.13287/j.1001-9332.201702.031

应用生态学报 ›› 2017, Vol. 28 ›› Issue (2): 658-664.doi: 10.13287/j.1001-9332.201702.031

嘉陵江下游蛇鮈的两性异形与雌性个体生殖力

胡月¹, 曾燏^{1, 2*}, 蒋朝明¹, 周材权^{1, 2}

¹西华师范大学生命科学学院, 四川南充 637000;
²西南野生动植物资源保护教育部重点实验室, 四川南充 637000

收稿日期:2016-05-30 出版日期:2017-02-18 发布日期:2017-02-18
通讯作者: * E-mail: biologyfe@gmail.com
作者简介:胡月, 女, 1993年生, 硕士研究生. 主要从事鱼类生态学研究. E-mail: arielprince@vip.qq.com
基金资助:
本文由国家自然科学基金项目(51309196)和四川省科技厅重点项目(2016JY0097)资助

Sexual size dimorphism and female individual fecundity of Saurogobio dabryi in the lower reaches of the Jialing River, Southwest China.

HU Yue¹, ZENG Yu^{1, 2*}, JIANG Zhao-ming¹, ZHOU Cai-quan^{1, 2}

¹College of Life Science, China West Normal University, Nanchong 637000, Sichuan, China;
²Ministry of Education Key Laboratory of Southwest China Wildlife Resources Conservation, Nanchong 637000, Sichuan, China.

Received:2016-05-30 Online:2017-02-18 Published:2017-02-18
Contact: * E-mail: biologyfe@gmail.com
Supported by:
This work was supported by the National Natural Science Foundation of China (51309196) and the Science and Technology Department Foundation of Sichuan Province (2016JY0097)

摘要/Abstract

摘要： 为了解蛇鮈雌雄间是否存在显著的外部形态差异及雌性个体生殖力情况, 在繁殖期对嘉陵江下游(合川江段)共76尾蛇鮈样本的两性异形、性比及雌性个体生殖力进行分析.结果表明: 嘉陵江下游蛇鮈繁殖群体的性比接近1∶1,且蛇鮈两性的体型大小相同,但局部特征(如头部和躯干部等)呈现出显著的两性异形,如成体雄性蛇鮈的头部、胸鳍和腹鳍均较雌性蛇鮈大,而躯干部的体宽、体高和躯干长则是雌性蛇鮈大于雄性蛇鮈,这可能是性选择长期作用的结果.主成分分析显示,前3个主成分的累积贡献率达75.2%,但雌雄个体间形态特征相互重叠,无法将两者截然分开;利用判别函数对蛇鮈性别进行回判,综合判别准确率为92.1%.蛇鮈雌性个体绝对生殖力在979～19979粒;且与体长和去内脏体质量均呈显著正相关.同历史资料相比,本研究中嘉陵江蛇鮈的生殖力增大显著,这可能是蛇鮈对种群资源量下降和水环境变化主动适应的结果.

关键词: 两性异形, 性选择, 生态适应

Abstract: To investigate the sexual morphological differences and female individual fecundity of Saurogobio dabryi, the sexual size dimorphism, sex ratio and female individual fecundity of 76 individuals collected from the lower reaches of the Jialing River (Hechuan section) in breeding season were analyzed. The results showed that the sex ratio of S. dabryi in the downstream of Jialing River was 1:1 in the breeding season, and no significant difference in the body size between males and females. However, some local morphological traits (such as cephalosome and the truck) exhibited significant difference between males and females, for example, the head, the pectoral fin and the pelvic fin were significantly larger in males than in females, while the width, height and length of trunk exhibited the opposite results, all which were related to the sexual selection. A principal component analysis showed that the first three components accounted for 75.2% of variations in the morphological variables. However, all traits overlapped between males and females, thus they could not be separated by morphological characters. By establishing discrimination function, 92.1% samples could be distinguished. The individual fecundity of S. dabryi ranged from 979 to 19979 eggs, and exhibited significant positive relationship with body length and carcass mass. Compared with the historical data, the fecundities of S. dabryi increased significantly in the present study, which should be the active adaption of the species to the currently depleting population, as well as to the changing of water ecological environment.

Key words: sexual dimorphism, ecological adaptation, sexual selection

胡月, 曾燏, 蒋朝明, 周材权. 嘉陵江下游蛇鮈的两性异形与雌性个体生殖力[J]. 应用生态学报, 2017, 28(2): 658-664.

HU Yue, ZENG Yu, JIANG Zhao-ming, ZHOU Cai-quan. Sexual size dimorphism and female individual fecundity of Saurogobio dabryi in the lower reaches of the Jialing River, Southwest China.[J]. Chinese Journal of Applied Ecology, 2017, 28(2): 658-664.

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嘉陵江下游蛇鮈的两性异形与雌性个体生殖力

Sexual size dimorphism and female individual fecundity of Saurogobio dabryi in the lower reaches of the Jialing River, Southwest China.

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