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A classification framework for interspecific trade‐offs in aquatic ecology

Eric R B Smyth,D. Drake

Published 2021 in Conservation Biology

ABSTRACT

In some cases, wildlife management objectives directed at multiple species can conflict with one another, creating species trade‐offs. For managers to effectively identify trade‐offs and avoid their undesirable outcomes, they must understand the agents involved and their corresponding interactions. A literature review of interspecific trade‐offs within freshwater and marine ecosystems was conducted to illustrate the scope of potential interspecific trade‐offs that may occur. We identified common pitfalls that lead to failed recognition of interspecific trade‐offs, including, single‐species management and limited consideration of the spatial and temporal scale of ecosystems and their management regimes. We devised a classification framework of common interspecific trade‐offs within aquatic systems. The classification can help managers determine whether the conflict is species based through direct relationships (i.e., predator–prey, competition, other antagonistic relationships) or indirect relationships involving intermediate species (i.e., conflict‐generating species) or whether the conflict is driven by opposing management objectives for species that would otherwise not interact (i.e., nontarget management effects). Once the nature and scope of trade‐offs are understood, existing decision‐making tools, such as structured decision‐making and real‐options analysis, can be incorporated to improve the management of aquatic ecosystems.

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