| 摘要: |
| 为研究短蛸(Octopus ocellatus)的性选择行为，本研究利用14个多态性微卫星标记，对3个母本、176个子代及17个候选父本进行亲权鉴定，对3个家系中有子代和无子代雄蛸、子代比例高和子代比例低的雄蛸的各形态参数进行t检验，并对子代比例高和子代比例低的父本与母本的遗传相似性与遗传距离进行分析。结果显示，短蛸为多雌多雄的交配模式，为真正意义的雌性混交动物；雄蛸有无子代与其形态参数无相关性；子代比例与父本的形态大小参数无关，而与父母本的遗传相似性和遗传距离有关，父母本遗传相似性越高，遗传距离越小，后代比例越高。本研究为揭示短蛸交配前后的性选择机制提供了重要线索，也为海洋头足类动物的性选择机制研究提供了基础资料。 |
| 关键词: 短蛸 微卫星标记 亲权鉴定 交配模式 性选择 |
| DOI：10.19663/j.issn2095-9869.20190118002 |
| 分类号: |
| 基金项目: |
|
| Sexual Selection in Octopus ocellatus Based on Microsatellite Paternity Identification Technology |
|
FAN Tingting1,2, FENG Yanwei2, LIU Wenfen3, WANG Weijun4, YANG Jianmin4
|
|
1.National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306;2.Shandong Provincial Key Laboratory of Restoration for Marine Ecology, Shandong Marine Resource and Environment Research Institute, Yantai 264006;3.Laboratory of Quality and Safety Risk Assessment for Aquatic Products, Ministry of Agriculture and Rural Affairs, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430070;4.School of Agriculture, Ludong University, Yantai 264025
|
| Abstract: |
| Octopus ocellatus, affiliated to Octopodidae under the phylum Mollusca, is one of the most important economic species along the northern coastal areas of China. It has been considered as a candidate for aquaculture enhancement and release owing to its short life span and rapid growth. However, little is known about sexual selection before and after copulation in this species. To explore the mechanism of sexual selection in O. ocellatus, 11 morphological parameters of 36 adult octopuses were first measured and analyzed. Afterwards, 14 polymorphic microsatellite DNA markers were used to identify the paternity of 176 offspring and 3 female and 17 male parent candidates. The morphological parameters of male parents with and without offspring and those with high and low proportion of offspring were analyzed in three families by the t-test. The genetic similarity between female and male parents which had high and low percentage of offspring was also calculated. The results showed that there was a strong correlation between mantle length, wrist 2, wrist 6, and body weight in male octopuses, and that sexual dimorphism in the total weight and mantle width between male and female octopuses existed. Paternity testing revealed all three females mated with more than two males and 10 males mated with at least two females, which confirmed the polygyny and polyandry pattern in this species. There was no correlation between male octopuses with or without offspring and their morphological parameters. Moreover, the proportion of offspring was not related to the morphological parameters of males but was correlated to the genetic similarity and genetic distance between female and male parents—higher the genetic similarity, higher the proportion of offspring. This study provides a scientific basis for the resource protection and artificial breeding of O. ocellatus, and also, important information for research on the mechanism of sexual selection in marine cephalopods. |
| Key words: Octopus ocellatus Microsatellite markers Paternity testing Mating pattern Sexual selection |
