Novel and Disrupted Trophic Links Following Invasion in Freshwater Ecosystems
Michelle C. Jackson,Michelle C. Jackson,Ryan J. Wasserman,Ryan J. Wasserman,Jonathan Grey,Anthony Ricciardi,Jaimie T. A. Dick,Mhairi E. Alexander +7 more
TLDR
It is concluded that invasive species often drastically alter food webs by creating and disrupting trophic links, and future research should be directed particularly towards disentangling the effects of invaders from other environmental stressors.Abstract:
When invasive species become integrated within a food web, they may have numerous direct and indirect impacts on the native community by creating novel trophic links, and modifying or disrupting existing ones. Here we discuss these impacts by drawing on examples from freshwater ecosystems, and argue that future research should quantify changes in such trophic interactions (i.e. the links in a food web), rather than simply focusing on traditional measures of diversity or abundance (i.e. the nodes in a food web). We conceptualise the impacts of invaders on trophic links as either direct consumption, indirect trophic effects (e.g. cascading interactions, competition) or indirect nontrophic effects (e.g. behaviour mediated). We then discuss how invader impacts on trophic links are context-dependent, varying with invader traits (e.g. feeding rates), abiotic variables (e.g. temperature, pH) and the traits of the receiving community (e.g. predators or competitors). Co-occurring invasive species and other environmental stressors, such as climate change, will also influence invader impacts on trophic links. Finally, we discuss the available methods to identify new food web interactions following invasion and to quantify how invasive species disrupt existing feeding links. Methods include direct observations in the field, laboratory trials (e.g. to quantify functional responses) and controlled mesocosm experiments to elucidate impacts on food webs. Field studies which use tracer techniques, such as stable isotope analyses, allow diet characterisation of both invaders and interacting native species in the wild. We conclude that invasive species often drastically alter food webs by creating and disrupting trophic links, and future research should be directed particularly towards disentangling the effects of invaders from other environmental stressors.read more
Citations
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Bivalve Impacts in Freshwater and Marine Ecosystems
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Global economic costs of aquatic invasive alien species
Ross N. Cuthbert,Zarah Pattison,Nigel G. Taylor,Laura N. H. Verbrugge,Christophe Diagne,Danish A. Ahmed,Boris Leroy,Elena Angulo,Elizabeta Briski,César Capinha,Jane A. Catford,Tatenda Dalu,Franz Essl,Rodolphe E. Gozlan,Phillip J. Haubrock,Melina Kourantidou,Andrew M. Kramer,David Renault,Ryan J. Wasserman,Franck Courchamp +19 more
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Feeding ecology of generalist consumers: a case study of invasive blue catfish Ictalurus furcatus in Chesapeake Bay, Virginia, USA
TL;DR: Blue catfish feed primarily on invasive aquatic vegetation and Asian clams, though the economically-valuable blue crab Callinectes sapidus is also consumed regularly, and the per capita impact of blue catfish on imperiled native species appears to be low, but could still be substantial due to high population densities.
Journal ArticleDOI
On the RIP: using Relative Impact Potential to assess the ecological impacts of invasive alien species
James W. E. Dickey,Ross N. Cuthbert,Josie South,J.R. Britton,J.M. Caffrey,Xuexiu Chang,Kate Crane,Neil E. Coughlan,E. Fadaei,Keith D. Farnsworth,S.M.H. Ismar-Rebitz,Patrick W.S. Joyce,Matthew L. Julius,Ciaran Laverty,Frances E. Lucy,Hugh J. MacIsaac,Monica McCard,C.L.O. McGlade,Neil Reid,Anthony Ricciardi,Ryan J. Wasserman,Olaf L. F. Weyl,Jaimie T. A. Dick +22 more
TL;DR: It is proposed that RIP provides scientists and practitioners with a user-friendly, customisable and, crucially, powerful technique to inform invasive species policy and management.
Journal ArticleDOI
Invasive Apple Snail Diets in Native vs. Non-Native Habitats Defined by SIAR (Stable Isotope Analysis in R)
TL;DR: Invasive apple snails adversely impact the ecological function of non-native habitats, resulting in eutrophication as well as reduced biodiversity, which diminishes ecosystem goods and services, thereby [negatively] impacting human well-being as discussed by the authors .
References
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