大型水库鲢鱼和两种本地浮游动物的同位素生态位

IF 1.7 4区 环境科学与生态学 Q3 ECOLOGY
Freshwater Science Pub Date : 2022-08-04 DOI:10.1086/722054
D. Lebeda, Allison M. Lebeda, M. Flinn
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引用次数: 0

摘要

人类介导的生物入侵可以大大减少本地物种的多样性。超过138种非本地鱼类已被引入美国。这些非本地物种中的许多可以改变生态系统动态,并与本地物种竞争。浮游鲢鱼(Hyphonthamichthys molitrix Valenciennes in Cuvier and Valenciennens,1844)是一种令人担忧的非本地物种,目前正在美国中西部的大密西西比河流域扩大其范围。我们研究的目的是确定入侵鲢鱼与肯塔基湖(位于肯塔基州西部和田纳西州的一个大型水库)的本地浮游动物Gizzard Shad(Dorosoma cepedianum Lesueur,1818)和Threadfin Shad(多里斯玛petenense Günther,1867)之间的潜在竞争程度。我们使用来自N和C同位素的数据来建模同位素生态位,计算定量指标来描述同位素生态位和营养位置内部和之间的可变性,并定性评估营养位置的季节变化。我们的研究结果表明,在春季,年长(≥1岁)的鲢鱼与一年中的年长和年幼(YOY;<1岁)的Gizzard Shad共享资源,而YOY鲢鱼仅与YOY Gizzard Shad共享资源。此外,我们的分析表明,年长的鲢鱼和年长的Gizzard Shad在夏天共享资源。相比之下,我们发现YOY Threadfin Shad和YOY或更老的鲢鱼在资源使用方面没有重叠。此外,我们提供了同位素生态位区域的种内个体发生变化以及入侵鱼类和本地鱼类之间重叠的证据(通过样本大小校正的标准椭圆区域测量)。如果资源受到限制,入侵的鲢鱼可能会与肯塔基湖Gizzard Shad的多个生命阶段竞争,并改变食物网的动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic niches of Silver Carp and two native planktivores in a large reservoir
Human-mediated biological invasions can greatly reduce native species diversity. More than 138 nonnative fishes have been introduced to the United States. Many of these nonnative species can alter ecosystem dynamics and compete with native species. The planktivorous Silver Carp (Hypophthalmichthys molitrix Valenciennes in Cuvier and Valenciennes, 1844) is a nonnative species of concern that is currently expanding its range across the Greater Mississippi River Basin in the Midwestern United States. The objective of our study was to determine the degree of potential competition among invasive Silver Carp and the native planktivores, Gizzard Shad (Dorosoma cepedianum Lesueur, 1818) and Threadfin Shad (Dorosoma petenense Günther, 1867), in Kentucky Lake, a large reservoir located in western Kentucky and Tennessee. We used data derived from N and C isotopes to model isotopic niches, calculate quantitative metrics to describe variability within and among isotopic niches and trophic positions, and qualitatively assess seasonal shifts in trophic positions. Our results suggest that in the spring, older (≥1 y old) Silver Carp share resources with older and young-of-year (YOY; <1 y old) Gizzard Shad, whereas YOY Silver Carp only share resources with YOY Gizzard Shad. Additionally, our analyses showed that older Silver Carp and older Gizzard Shad share resources in the summer. In contrast, we found no overlap in resource use between YOY Threadfin Shad and YOY or older Silver Carp. Furthermore, we provide evidence of intraspecific ontogenetic shifts in isotopic niche area and overlap between invasive and native fishes (measured by sample-size corrected standard ellipse area). If resources become limiting, invasive Silver Carp may compete with multiple life stages of Gizzard Shad in Kentucky Lake and alter foodweb dynamics.
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来源期刊
Freshwater Science
Freshwater Science ECOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
4.10
自引率
0.00%
发文量
49
审稿时长
6-12 weeks
期刊介绍: Freshwater Science (FWS) publishes articles that advance understanding and environmental stewardship of all types of inland aquatic ecosystems (lakes, rivers, streams, reservoirs, subterranean, and estuaries) and ecosystems at the interface between aquatic and terrestrial habitats (wetlands, riparian areas, and floodplains). The journal regularly features papers on a wide range of topics, including physical, chemical, and biological properties of lentic and lotic habitats; ecosystem processes; structure and dynamics of populations, communities, and ecosystems; ecology, systematics, and genetics of freshwater organisms, from bacteria to vertebrates; linkages between freshwater and other ecosystems and between freshwater ecology and other aquatic sciences; bioassessment, conservation, and restoration; environmental management; and new or novel methods for basic or applied research.
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