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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Your Position :Home->Past Journals Catalog->2018 Vol.37 No.5

Sex Dimorphism of Micropercops swinhonis During Reproduction and Non-Reproduction Period
Author of the article:JIN Jinjin1,2, ZHANG Fangfang1,2, QIU Yuping1,2, CHEN Guozhu1,2*
Author's Workplace:1. National Wetland Ecosystem Fixed Research Station of Dianchi, Southwest Forestry University, Kunming 650224, China;
2. College of Wetland, National Plateau Wetland Research Center, Southwest Forestry University, Kunming 650224, China
Key Words:biological invasions; Micropercops swinhonis; sex dimorphism; reproduction period
Abstract:Currently, researchers are interested in the sex dimorphism of alien species as it might play a significant role during the process of alien species invasion. A freshwater goby, Micropercops swinhonis, which is the typical invasive fish in Dianchi Lake, Kunming, China, has been reported to have sex dimorphism; however, there is no definite quantitative data to support this opinion. In order to determine whether the sex dimorphism in M. swinhonis is real and to make a preliminary comprehension on the relationship between the fish invasive ability and sex dimorphism, a morphological analysis of male and female M. swinhonis was conducted in this study. Fish was collected from a basin named Huahongyuan, Kunming, China, which is around the Dianchi Lake watershed. The results showed that a generation replacement occurred between May and June 2017, thus 2 reproduction groups of M. swinhonis were detected, generation Ⅰ and generation Ⅱ. Generation Ⅰ was collected from Spetember 2016 to May 2017. Generation Ⅱ occurred at the late of March 2017 should be the offsprings of generation Ⅰ and was collected from June to July 2017. Additionally, significant differences were observed in many measurements between the male and female M. swinhonis both in the reproduction and non-reproduction period samples. The male M. swinhonis were much larger than the females in the reproduction period; however, there was no significant difference in the non-reproduction period. By using One-Way ANOVA, principal component analysis and discriminant analysis, the sex dimorphism of M. swinhonis was revealed. Principal component analysis showed that the morphologies of male and female M. swinhonis in generation Ⅰ were separated along with the axis of the second principal component (PC2), and the ratio of the depth of caudal peduncle vs. body depth, the length from the starting point of the peritoneal fin to the start point of the anal fin vs. standard body length suggested to be the principal measurements which had a major contribution to the morphological difference between males and females. However, in generation Ⅱ, the male and female fish morphologies were diverged in the axis of the first principal component (PC1), and the total length, standard length, etc. were the principal measurements which had a major contribution to the morphological difference between males and females. Reproductive selection pressure and reproductive strategy adaptation are suggested to be the driving force for the M. swinhonis to form the sex dimorphism in which the males are much larger than the females might benefit to the early survival rate of the offsprings. As a result, sex dimorphism in M. swinhonis has a considerable meaning to their population expansion during their invasion process.
2018,37(5): 507-518 收稿日期:2017-11-07
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