The current distribution of invasive mrigal carp (Cirrhinus mrigala) in Southern China, and its potential impacts on native mud carp (Cirrhinus molitorella) populations
文献类型： 外文期刊
作者： Yu, Fan Dong 1 ; Gu, Dang En 1 ; Tong, Yan Nan 3 ; Li, Gao Jun 3 ; Wei, Hui 1 ; Mu, Xi Dong 1 ; Xu, Meng 1 ; Yang, Ye Xin 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Key Lab Recreat Fisheries, Minist Agr & Rural Affairs, Guangzhou, Guangdong, Peoples R China
2.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai, Peoples R China
3.Hainan Acad Ocean & Fisheries Sci, Haikou, Hainan, Peoples R China
关键词： Invasive species; distribution; temperature; eutrophication; mrigal carp (Cirrhinus mrigala); mud carp (Cirrhinus molitorella); China
期刊名称：JOURNAL OF FRESHWATER ECOLOGY （ 影响因子：1.132； 五年影响因子：1.593 ）
ISSN： 0270-5060
年卷期： 2019 年 34 卷 1 期
页码：
收录情况： SCI
摘要： Invasive species are a major and growing threat to China's native freshwater biodiversity. They have caused species extinctions, biodiversity loss, and environmental changes. Mrigal carp (Cirrhinus mrigala), one of the most widespread and invasive of freshwater fish species, now occurs in major rivers throughout southern China. We report the current (to 2017) distribution of mrigal carp throughout southern China, and experiments with temperature, water quality and food availability, that assess possible impacts of this species on populations of native mud carp (C. molitorella)". In the wild, the mud carp to mrigal carp weight ratio was 1:1.65. Mrigal carp were a dominant species in some rivers of southern China, such as Liuxi River, Zengjiang River and the Zhaoqing section of Xijiang River. Manipulative experiments reveal mrigal carp to be more tolerant of colder temperature, more eutrophic conditions, and lower dissolved oxygen levels than mud carp. In food-limited experiments, mrigal carp displayed no direct aggression towards mud carp, but they did snatch food from them, and excluded them from eating. Mud carp growth was curtailed in the presence of mrigal carp in food-limited treatments, with a growth rate 2.71%, only 17.02% of that in treatments where carp were fed to satiation. In satiation treatments, mrigal carp also grew up to 2.21 times faster than mud carp. Our results indicate that mrigal carp will outcompete mud carp for resources and habitat, and that both its distribution and population will increase in the future.
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