Comparison of trophic function between the globally invasive crayfishes Pacifastacus leniusculus and Procambarus clarkii
Comparison of trophic function between the globally invasive crayfishes Pacifastacus leniusculus and Procambarus clarkii
复制标题
全球入侵小龙虾太平洋螯虾与克氏原螯虾营养功能比较
作者：
E. Larson;Laura A Twardochleb;J. Olden
如果入侵物种在功能上与它们经常取代的本地物种高度不同，那么它们的影响可能会表现得最为强烈。然而，我们是否应该预期淡水小龙虾等普通生物的本地物种和入侵物种之间存在功能差异？一些现有证据表明本地和入侵小龙虾物种在生态上是等效的。我们通过比较全球入侵小龙虾 Pacifastacus leniusculus 和 Procambarus clarkii 的营养位，对美国华盛顿州西部的异域（单独）和同域（共同）湖泊种群进行碳和氮稳定同位素分析，为该文献做出了贡献，该州最近引入了克氏小龙虾，并推测克氏原螯虾是本地小龙虾。我们的研究利用线性混合效应模型中的随机效应，纠正了由于湖泊非生物或生物特征而导致的湖泊食物网潜在的固有差异。我们发现，虽然这些物种的总体营养生态位大小或面积没有显着差异，但当同时考虑体型、性别和湖泊的影响作为随机效应时，P. leniusculus 的营养位置显着高于 P. clarkii。随着时间的推移，细纹对虾相对克氏对虾的营养位置增加的模式在我们拥有多年数据的同域湖泊中得以保留。总的来说，我们的研究结果指出了全球小龙虾 P. leniusculus 和 P. clarkii 之间的营养差异，特别是在考虑生态系统环境如何影响群落食物网结构以及这些消费者可用的营养资源时。
Impacts of invasive species may manifest most strongly if these organisms are highly distinct functionally from the native species they often replace. Yet, should we expect functional differences between native and invasive species of generalist organisms like freshwater crayfish? Some existing evidence has pointed to native and invasive crayfish species as ecologically equivalent. We contribute to this literature by comparing the trophic niches of the globally invasive crayfishes Pacifastacus leniusculus and Procambarus clarkii, by applying carbon and nitrogen stable isotope analyses to replicated allopatric (alone) and sympatric (together) lake populations in western Washington State, USA, where P. clarkii has been recently introduced and P. leniusculus is presumed native. Our study corrected for potential inherent differences in lake food webs as a consequence of lake abiotic or biotic characteristics using random effects in linear mixed effects models. We found that although overall trophic niche size or area of these species was not significantly different, P. leniusculus was significantly higher in trophic position than P. clarkii when also accounting for the effects of body size, sex, and lakes as random effects. This pattern of increased trophic position of P. leniusculus over P. clarkii was conserved over time in one sympatric lake for which we had data over multiple years. Cumulatively, our findings point to trophic differences between the globally cosmopolitan crayfishes P. leniusculus and P. clarkii, particularly when accounting for the ways that ecosystem context can affect food web structure of communities and the trophic resources available to these consumers.
影响因子：
5.9
作者：
Comte, Lise;Cucherousset, Julien;Olden, Julian D.
通讯作者：
Olden, Julian D.