Jordan H. Hartman, Mark A. Davis, Nicholas J. Iacaruso, Jeremy S. Tiemann, Eric R. Larson
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引用次数: 0
摘要
与野味鱼类相比,研究人员、管理人员和政策制定者历来忽视非野味鱼类,这种忽视已延伸到美国的入侵非野味鱼类。其中一种鱼--东带鳉(Fundulus diaphanus diaphanus Lesueur 1817)--自 2000 年以来在密歇根湖及相连水域建立并迅速蔓延。在此,我们评估了东带鳉成功入侵的潜在驱动因素,以及它们破坏本地群落和食物网的可能性。具体而言,我们利用稳定同位素和肠道内容代谢编码分析,比较了东带箭鱼与本地亚种西带箭鱼(Fundulus diaphanus menona Jordan and Copeland 1877)之间的营养位广度和食物组成。稳定同位素分析表明,与西带鳉相比,东带鳉在沿岸依赖性和营养位置方面的差异更大,但稳定同位素和肠道成分代谢编码分析表明,两个亚种的食物组成和营养位置存在重叠。与西带鳉相比,东带鳉的摄食变异性更高,因此可能会成功地在其原生地以外的地方建立栖息地,包括原生亚种历史上未使用过的栖息地,但这两个亚种之间的营养生态位总体上相似。这项研究为一种可能被忽视的非野味鱼类--东带鳉的成功入侵提供了见解,同时也首次比较了一种入侵淡水鱼类的稳定同位素和肠道内容代谢编码分析。
Stable isotopes and diet metabarcoding reveal trophic overlap between native and invasive Banded Killifish (Fundulus diaphanus) subspecies
Researchers, managers, and policymakers have historically neglected non-game fishes relative to game fishes, and this oversight has extended to invasive non-game fishes in the United States. One such fish—the Eastern Banded Killifish (Fundulus diaphanus diaphanus Lesueur 1817)—has established and rapidly spread in Lake Michigan and connected waters since 2000. Here, we assess potential drivers of the successful invasion of Eastern Banded Killifish, as well as their potential to disrupt native communities and food webs. Specifically, we compare the trophic niche breadth and diet composition between Eastern Banded Killifish and a native subspecies, Western Banded Killifish (Fundulus diaphanus menona Jordan and Copeland 1877), using stable isotope and gut content metabarcoding analyses. Stable isotope analysis showed that Eastern Banded Killifish had a higher variance in littoral dependence and trophic position than Western Banded Killifish, but both stable isotope and gut content metabarcoding analyses revealed an overlap in the diet composition and trophic position between the subspecies. Eastern Banded Killifish may successfully establish outside its native range due to higher feeding variability than Western Banded Killifish, including in habitats historically unused by the native subspecies, but the trophic niche between these two subspecies was similar overall. This study provides insights into the successful invasion of a potentially overlooked non-game fish—Eastern Banded Killifish—while also comparing stable isotope and gut content metabarcoding analyses for an invasive freshwater fish for the first time.
期刊介绍:
Environmental Biology of Fishes is an international journal that publishes original studies on the ecology, life history, epigenetics, behavior, physiology, morphology, systematics and evolution of marine and freshwater fishes. Empirical and theoretical papers are published that deal with the relationship between fishes and their external and internal environment, whether natural or unnatural. The journal concentrates on papers that advance the scholarly understanding of life and draw on a variety of disciplines in reaching this understanding.
Environmental Biology of Fishes publishes original papers, review papers, brief communications, editorials, book reviews and special issues. Descriptions and submission requirements of these article types can be found in the Instructions for Authors.