Habitat alteration facilitates the dominance of invasive species through disrupting niche partitioning in floodplain wetlands

Aim: Exotic species invasion often leads to declines in local and regional biodiversity, particularly in freshwater ecosystems. This biodiversity loss is generally facilitated by human activities such as land cover change and hydrological alternation. Recent advances in stable isotope analysis (SIA) have been highlighted in many studies addressing fundamental issues in invasion ecology, especially in quantifying competition for resources between native and exotic species. However, how anthropogenic disturbance influences trophic relationships among invasive and native species remains poorly understood.

Location: Middle-lower Yangtze River region, China

Methods: To investigate the effects of human disturbance on interspecific trophic interactions, this study compared isotopic niche space and overlap of the introduced red swamp crayfish (Procambarus clarkii) and the native oriental river shrimp (Macrobrachium nipponense) and freshwater snail (Bellamya aeruginosa) in natural and modi...

研究目的：外来物种入侵常导致局域及区域生物多样性下降，尤以淡水生态系统为甚。此类生物多样性丧失通常由土地覆被变化、水文过程改变等人类活动所促成。近年来，稳定同位素分析（stable isotope analysis, SIA）在诸多入侵生态学基础问题研究中受到广泛关注，尤其在量化本土与外来物种间的资源竞争方面。然而，人为干扰如何影响入侵种与本土种间的营养关系，目前仍知之甚少。
研究区域：中国长江中下游地区
研究方法：为探明人为干扰对物种种间营养相互作用的影响，本研究对比了自然与改造生境中，引入种红沼泽螯虾（克氏原螯虾，*Procambarus clarkii*）、本土种日本沼虾（*Macrobrachium nipponense*）以及淡水螺铜锈环棱螺（*Bellamya aeruginosa*）的同位素生态位空间及其重叠度。