Opportunistic-tended life history traits of Siniperca kneri in the Three Gorges Reservoir,China: potential responses to impoundment  

作　　者：ZHAO Shasha CHENG Fei HOU Gang HU Zhengyu XIE Songguang 

机构地区：[1]Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China [4]Key Laboratory of Sustainable Fisheries and Environmental Protection for Lakes of Northern Jiangsu, Huai’an Research Center, Institute of Hydrobiology, Chinese Academy of Sciences, Huai’an 223002, China

出　　处：《Journal of Oceanology and Limnology》2019年第2期694-705,共12页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(Nos.51209202,31570420);the Science and Technology Research Project of China Three Gorges Corporation(No.CT-12-08-01);the Hubei Key Laboratory of Three Gorges Project for Conservation of Fishes(No.0704101)

摘　　要：Reservoir impoundment changes original fluvial habitats into lentic environments. Fish species adapted to lentic habitats may take the advantage of such habitat changes and show typical life history traits might facilitate the population increase. Siniperca kneri rarely occurred in fishery landing in the Three Gorges Reservoir (TGR) area before its impoundment in 2003, but it is now a dominant species. In this study, a total of 438 females of S . kneri were collected monthly during September 2012 through January 2014 using gill nets in the TGR. The age, growth, and reproductive biology were then investigated, and compared with other S . kneri populations. The standard length at age 1 was 149.9 mm in the TGR, which is larger than the three compared populations (i.e., Sandaohe Reservoir, Xinfengjiang Reservoir, and North River), but smaller than one (the Guishi Reservoir). The youngest mature female in the TGR was age 1, which is younger than that of the two compared populations (i.e., Xinfengjiang Reservoir and the North River). The relative fecundity in the TGR was 140 eggs/g, which is higher than that of the only available compared population (Xinfengjiang Reservoir, 96 eggs/g). Our results demonstrated that S . kneri in the TGR tended to have faster growth in the first year, a younger age at first maturation, and higher reproductive eff ort. We suggest that such opportunistic-tended life history traits might facilitate rapid increase of the population.Reservoir impoundment changes original fluvial habitats into lentic environments. Fish species adapted to lentic habitats may take the advantage of such habitat changes and show typical life history traits might facilitate the population increase. Siniperca kneri rarely occurred in fishery landing in the Three Gorges Reservoir(TGR) area before its impoundment in 2003, but it is now a dominant species. In this study, a total of 438 females of S. kneri were collected monthly during September 2012 through January2014 using gill nets in the TGR. The age, growth, and reproductive biology were then investigated, and compared with other S. kneri populations. The standard length at age 1 was 149.9 mm in the TGR, which is larger than the three compared populations(i.e., Sandaohe Reservoir, Xinfengjiang Reservoir, and North River), but smaller than one(the Guishi Reservoir). The youngest mature female in the TGR was age 1,which is younger than that of the two compared populations(i.e., Xinfengjiang Reservoir and the North River). The relative fecundity in the TGR was 140 eggs/g, which is higher than that of the only available compared population(Xinfengjiang Reservoir, 96 eggs/g). Our results demonstrated that S. kneri in the TGR tended to have faster growth in the first year, a younger age at first maturation, and higher reproductive ef fort.We suggest that such opportunistic-tended life history traits might facilitate rapid increase of the population.

关 键 词：SINIPERCA kneri life history TRAITS OPPORTUNISTIC growth REPRODUCTION COLONIZATION 

分 类 号：P[天文地球]