一种入侵掠食者在不改变食物网功能状态或稳定性的情况下大幅改变了能量通量

IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Hayley C. Glassic, James R. Junker, Christopher S. Guy, Lusha M. Tronstad, Michelle A. Briggs, Lindsey K. Albertson, Dominique R. Lujan, Travis O. Brenden, Timothy E. Walsworth, Todd M. Koel
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引用次数: 0

摘要

了解入侵物种如何影响生态系统的稳定性和功能对保护至关重要。在这里,我们使用食物网能量学方法量化了被积极抑制的入侵物种对黄石湖生态系统的影响。我们比较了四种食物网状态的能量通量、功能状态和稳定性:入侵前的食物网和入侵后受到入侵物种积极抑制的三种食物网,即初始入侵、扩张和衰退。入侵导致大多数消费者的能量通量变化≥25%(±),入侵后总通量增加了两倍。黄石切喉鳟(Oncorhynchus virginalis bouvieri)这一受保护物种的通量在入侵后比入侵前减少了 2.8 倍,而入侵的湖鳟(Salvelinus namaycush)的通量则比最初的入侵网络高出 17.3 倍。入侵后的主要功能状态和食物网稳定性没有发生变化,这可能是由于引入了一种普通捕食者和抑制的稳定作用。黄石湖的湖鳟入侵导致能量通量发生了巨大变化,尽管没有改变功能状态或稳定性,但却使主导通量偏离了受保护物种。我们的研究表明,能量通量的变化可能是生态系统遭受入侵的信号,但功能状态或稳定性并不一定能反映入侵影响的程度。对于被入侵的鱼类群落,除了对猎物的直接影响外,还可以通过研究能量通量、功能状态和食物网稳定性,更好地了解入侵物种是如何控制食物网的。此外,对入侵物种以外的抑制效果进行评估,可以证明抑制管理行动对保护的深远价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

An Invasive Predator Substantially Alters Energy Flux Without Changing Food Web Functional State or Stability

An Invasive Predator Substantially Alters Energy Flux Without Changing Food Web Functional State or Stability

Understanding how invasive species affect the stability and function of ecosystems is critical for conservation. Here, we quantified the effect of an actively suppressed invasive species on the Yellowstone Lake ecosystem using a food web energetics approach. We compared energy flux, functional state, and stability of four food web states: a pre-invasion network and three post-invasion networks undergoing active invasive species suppression, namely, initial invasion, expansion, and decline. Invasion caused ≥ 25% change (±) in energy flux for most consumers, and total flux increased twofold post-invasion. Flux to the species of conservation concern, Yellowstone cutthroat trout (Oncorhynchus virginalis bouvieri), was 2.8 times less post-invasion versus pre-invasion, whereas invasive lake trout (Salvelinus namaycush) flux was up to 17.3 times higher compared to the initial invasion network. The dominant functional state and food web stability did not change post-invasion, likely due to introduction of a generalist predator and the stabilizing effect of suppression. Lake trout invasion in Yellowstone Lake caused large changes to energy flux, shifting dominant fluxes away from the species of conservation concern, despite not changing functional state or stability. We demonstrate that changes in energy flux may signal invasions in ecosystems, but functional state or stability may not necessarily reflect the magnitude of invasion influences. For invaded fish communities, a better understanding of how the invasive species control the food web beyond just the direct influence on prey can be achieved by investigating energy flux, functional state, and food web stability. Furthermore, evaluating the effect of suppression beyond the invasive species can demonstrate the far-reaching value of suppression management actions for conservation.

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来源期刊
Aquatic Conservation-Marine and Freshwater Ecosystems
Aquatic Conservation-Marine and Freshwater Ecosystems 环境科学-海洋与淡水生物学
CiteScore
5.50
自引率
4.20%
发文量
143
审稿时长
18-36 weeks
期刊介绍: Aquatic Conservation: Marine and Freshwater Ecosystems is an international journal dedicated to publishing original papers that relate specifically to freshwater, brackish or marine habitats and encouraging work that spans these ecosystems. This journal provides a forum in which all aspects of the conservation of aquatic biological resources can be presented and discussed, enabling greater cooperation and efficiency in solving problems in aquatic resource conservation.
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