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Biological invasions undermine the functional diversity of fish community in a large subtropical river

文献类型： 外文期刊

作者： Shuai, Fangmin 1 ; Lek, Sovan 3 ; Li, Xinhui 1 ; Zhao, Tian 4 ;

作者机构： 1.CAFS, Pearl River Fisheries Res Inst, Guangzhou 510380, Guangdong, Peoples R China

2.Minist Agr, Expt Stn Sci Observat Fishery Resources & Environ, Zhanjiang, Guangdong, Peoples R China

3.Univ Toulouse Paul Sabatier, 118 Route Narbonne, F-31062 Toulouse, France

4.Chinese Acad Sci, Chengdu Inst Biol, Beijing, Peoples R China

关键词： Biological invasions; Functional diversity; Functional differences; Fish community; Pearl River

期刊名称：BIOLOGICAL INVASIONS （ 影响因子：3.133； 五年影响因子：3.694 ）

ISSN： 1387-3547

年卷期： 2018 年 20 卷 10 期

页码：

收录情况： SCI

摘要： Biological invasions are considered to be one of the main threats to biodiversity. Invasions lead to a loss of native species, changes to species composition, and a shift in the functioning and stability of ecosystems. In this study, derived from nine consecutive years of monitoring data and based on morphological functional trait values measured at the individual-level, we quantified the functional differences between native and non-native fish species and further assessed how biological invasions impact on species richness and functional diversity in the large subtropical Pearl River in southern China. Specifically, we differentiated intraspecific functional variability by separating individuals of a species according to their different life stages. Our results provided strong evidence that native and non-native fish were significantly different in their functional attributes. Invasion caused no obvious change in species richness; however, the yearly increase in non-native populations was accompanied by a significant decrease in functional niches of native species and change in several aspects of functional diversity in the fish community. Decreasing functional richness, and increasing functional divergence and specialization, indicated that most native species had been replaced by non-native species with different specific functional traits, which may affect ecosystem stability. Notably, this study provided empirical evidence that functional diversity was more sensitive to biological invasions than species richness. Our results show that control of non-native aquatic species is both necessary and urgent in the Pearl River. An understanding of the processes described in this study can form the basis of conservation in fish community, which is critical to sustainable and successful fisheries.

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