水生生物学报2018，Vol.42Issue(4)：800-810,11.DOI:10.7541/2018.098
西南大西洋阿根廷滑柔鱼雄性个体的有效繁殖力特性研究
THE EFFECTIVE FECUNDITY IN MALE ILLEX ARGENTINUS IN SOUTHWEST ATLANTIC OCEAN
摘要
Abstract
Illex argentinus is one of the most important ommastrephid squids, due to its annual landing volume, and its key role as transient ‘biological pumps’ in southwest Atlantic ecosystem. In order to understand the fecundity characte-ristics of male ommastrephids, specimens of male I. argentinus, collected from December 2012 to March 2013, were used to analyze the fecundity and its relationship to reproductive development with biological statistics analysis. The results showed that the minimum biological size was 207.29 mm for mantle length (ML) and 162.55 g for body weight (BW). The effective fecundity (EF), defined as the sum of normal spermatophores in spermatophoric complex and sper-matophoric sac, was in an average of (374±280.33) spermatophores. The mean value of relative effective fecundity by mantle length was (179.18±117.66) spermatophores per millimeter. The length of spermatophores (SL) varied from 6.34 to 33.14 mm, and its mean value was (21.57±4.17) mm, which was (10.22±1.82)% of mantle length. Both EF and SL significantly increased with the onset of sexual maturation (P＜0.05). EF attained the maximum value at functiona-lly maturity stage (Ⅵ), with a mean value of (811±181.34) spermatophores. SL increased up to the mating stage (Ⅶ), whereby it attained a mean value of (23.89±3.87) mm. Meanwhile, both EF and SL showed significantly linear relation with mantle length (EF=–581.92+4.56ML, R2=0.17, P＜0.05; SL=5.77+0.075ML, R2=0.23, P＜0.05) and body weight (EF=16.55+1.77BW, R2=0.37, P＜0.05; SL=17.96+0.017BW, R2=0.17, P＜0.05), indicating that individual with bigger size has larger EF and longer SL. Furthermore, the compare datasets of fitted model analysis revealed that there was no significant difference between the linear relationship of EF-ML and that of EF-BW (P＞0.05). Based on multiple regres-sion analysis, however, the influence on EF from body weight was more significant than that from mantle length (P＜0.05). The compare datasets of fitted model analysis for SL showed that there was significant difference between the linear relationship of SL-ML and that of SL-BW (P＜0.001), although the multiple regression analysis suggested a comparative influence on SL from both mantle length and body weight (P＜0.001). These findings indicated that the EF of male I. argentinus was a strategy of adaptability to its short lifespan by producing and accumulating spermatophores along with reproductive development and body growth, and the length of spermatophores will also increase with time.关键词
阿根廷滑柔鱼/有效繁殖力/精荚长度/西南大西洋Key words
Illex argentinus/Effective fecundity/Spermatophore length/Southwest Atlantic Ocean分类
生物科学引用本文复制引用
宣思鹏,陈新军,林东明,陈子末..西南大西洋阿根廷滑柔鱼雄性个体的有效繁殖力特性研究[J].水生生物学报,2018,42(4):800-810,11.基金项目
国家自然科学基金(41276156) （41276156）
上海市自然科学基金(16ZR1415400) （16ZR1415400）
上海海洋大学科技发展专项(A2-0203-00-100213) （A2-0203-00-100213）
上海海洋大学博士科研启动基金(A2-0203-00-100325) （A2-0203-00-100325）
上海海洋大学大学生创新活动计划项目资助 [Supported by National Natural Science Foundation of China (41276156) （41276156）
Natural Science Foundation of Shanghai (16ZR1415400) （16ZR1415400）
Shanghai Ocean University’s Sci-Tech foundation (A2-0203-00-100213) （A2-0203-00-100213）
Shanghai Ocean University’s Postdoctoral Science Foundation (A2-0203-00-100325)] （A2-0203-00-100325）
