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Diet and Prey Selection of the Invasive American Bullfrog (Lithobates catesbeianus) in Southwestern China

文献类型： 外文期刊

作者： Liu, Xuan 1 ; Luo, Yu 2 ; Chen, Jiaxin 3 ; Guo, Yisong 4 ; Bai, Changming 1 ; Li, Yiming 1 ;

作者机构： 1.Chinese Acad Sci, Inst Zool, Key Lab Anim Ecol & Conservat Biol, Beijing 100101, Peoples R China

2.Guizhou Normal Univ, Sch Life Sci, Guiyang 550001, Peoples R China

3.S China Normal Univ, Sch Life Sci, Guangzhou 510631, Guangdong, Peoples R China

4.Yunyang Teachers Coll, Dept Ecol Chem & Environm Engn, Danjiangkou 442000, Peoples R China

5.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China

关键词： Amphibian decline;American bullfrog;diet preferences;invasive species;Babina pleuraden;predation

期刊名称：ASIAN HERPETOLOGICAL RESEARCH （ 影响因子：1.827； 五年影响因子：1.412 ）

ISSN： 2095-0357

年卷期： 2015 年 6 卷 1 期

页码：

收录情况： SCI

摘要： Invasive predators have been widely regarded as one of the principle drivers of the global decline of amphibians, which are among the most threatened vertebrate taxon on Earth. The American bullfrog (Lithobates catesbeianus) is identified as one of the most successful vertebrate invaders and has caused the decline or extinction of some native amphibians in many regions and countries including China. Based on field surveys and stomach content analyses, we examined the diet composition of the invasive bullfrog for the first time in two invaded populations in Yunnan Province, southwestern China, a region of global conservation priority, during the breeding season from 2008 to 2014. Additionally, we conducted the first quantitative study on the prey selection of this global invader among their invaded ranges after controlling for the local anuran assemblage and other aquatic preys in the environment. Our results showed that the range of food items in the stomachs of bullfrogs spanned more than 30 species belonging to ten taxonomic classes. Both of post-metamorphosis individuals and juveniles preyed upon native frogs, independent of the bullfrog's body size and mouth width. Importantly, Jacobs' selection index showed a bullfrog preference for the Yunnan pond frog (Babina pleuraden), one native endemic anuran with population decline, in terms of both food volume and occurrence. We therefore provided direct evidence on the predation impact of the invasive bullfrog on an endemic anuran and urged further efforts to prevent the dispersal of this invader into more fragile habitats to reduce their negative impacts on native amphibians.

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