Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 1769
Title: Native invaders: emerging challenges for conservation
Author: Michael P. Carey, Beth L. Sanderson, K. Barnas, Julian D. Olden
Publication Year: 2012
Journal: Frontiers in Ecology and the Environment
Volume: 10
Issue: 7
Pages: 373-381
Keywords: Range-filling invaders, dominant invaders, threaten and endangered salmonids, Columbia River Basin

 The term “invader” is typically paired with adjectives such as “non-native” and “alien”, yet native species can

also cause ecological and economic impacts that rival those of well-known invasive species. By spreading within

their historical range, attaining extreme abundances, and exerting severe per-capita effects as a result of predation

or competition, native invaders can create an unusual set of challenges for science, management, policy, and

society. Identifying when, where, and why species become invaders in their native ranges requires additional scientific

inquiry, outside the current focus of invasion biology. Management strategies often mitigate the symptoms

rather than address the causes of problematic native species invasions. Convincing stakeholders to comply

with management actions aimed at controlling native invaders creates societal challenges and policy makers

must prioritize goals from varied and often conflicting human interests. We illustrate these challenges by highlighting

native species that adversely affect threatened and endangered Pacific salmon (Oncorhynchus spp).

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