摘要
Reproductive traits of one invasive population in Lake Fuxian and two native populations in Lakes Chao and Dongting for Pseudorasbora parva were investigated to determine the variations in their reproductive strategies associated with the change of environmental conditions. Compared with the two native populations,P.parva markedly experienced the protraction in their spawning time and the decrease in mortality for adult individuals in Lake Fuxian. The three populations all got their first sexual maturity at the same age,but their total lengths at maturity were quite different for those in Lake Chao were significantly lower than in Lakes Fuxian and Dongting. Additionally,in spite that no significant difference occurred in their relative fecundities for P. parva in Lakes Fuxian and Dongting,the population in Lake Chao showed the markedly higher relative fecundity than the other two populations. These results were analyzed with the variations in water temperature,nutrient status,fishing stress among the three lakes. The relative decline in fecundity for the invasive population,which conflicted with the enemy release hypothesis,was disscussed with the context of the preponderance of another invasive fish,Neosalanx taihuensis,in Lake
Reproductive traits of one invasive population in Lake Fuxian and two native populations in Lakes Chao and Dongting for Pseudorasbora parva were investigated to determine the variations in their reproductive strategies associated with the change of environmental conditions. Compared with the two native populations, P.parva markedly experienced the protraction in their spawning time and the decrease in mortality for adult individuals in Lake Fuxian. The three populations all got their first sexual maturity at the same age, but their total lengths at maturity were quite different for those in Lake Chao were significantly lower than in Lakes Fuxian and Dongting. Additionally, in spite that no significant difference occurred in their relative fecundities for P. parva in Lakes Fuxian and Dongting, the population in Lake Chao showed the markedly higher relative fecundity than the other two populations. These results were analyzed with the variations in water temperature, nutrient status, fishing stress among the three lakes. The relative decline in fecundity for the invasive population, which conflicted with the enemy release hypothesis, was disscussed with the context of the preponderance of another invasive fish, Neosalanx taihuensis, in Lake Fuxian.
基金
funded by the Key Project for Knowledge Innovation of CAS(No.KSCX1-SW-13-04)
the National Key Project for Basic Research of China (No.2009CB119200)
关键词
麦穗鱼
洞庭湖湖区
生活习性
生理特征
Pseudorasbora parva, Enemy release hypothesis, Invasive fishes, Life history, Reproductive strategies