In many applications, conservation organizations depend on one species to indicate the presence of another. While extensive research has gone into methods for selecting these indicator species, few studies have directly measured the performance of indicator species in guiding conservation actions. Here, we evaluated whether a small number of indicator species could be used to efficiently select barrier removal projects to restore breeding habitat access for many other Great Lakes migratory fishes in the highly fragmented tributaries of the North American Great Lakes. First, we used a dataset of the historical distributions of 35 species of native migratory fishes to identify four clusters of co-occurring species, and then selected an indicator species for each cluster based on within-group co-occurrence or range width. We evaluated the utility of these indicator species by using upstream habitat and removal costs for 103,894 dams and road culverts across 1800 tributaries of the Great Lakes. We compared the potential increase in accessible tributary habitat for each species when barrier removals were prioritized to maximize benefits for (1) each species itself, versus (2) possible indicator species. We found that for 80% of the species, habitat gains from indicator-based project selection were at least 75% of the maximum gains possible under species-specific planning. However, a small subset of species would receive few habitat gains under indicator-directed project selection. Overall, our findings suggest that a suite of indicator species could be an efficient basis for planning restoration efforts for a majority of native migratory fishes in the Great Lakes.
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We are grateful for comments and suggestions from B. Hoagland, R. Loraamm, and LCLUC group at the University of Oklahoma on earlier drafts of this paper. Funding was provided by the Upper Mid-west and Great Lakes Landscape Conservation Cooperative, The Nature Conservancy’s Great Lakes Project, The University of Wisconsin, The Great Lakes Fishery Trust, The University of Michigan Water Center, and the Department of Interior Northeast Climate Science Center. Its contents are solely the responsibility of the authors and do not necessarily represent the views of the Northeast Climate Science Center or the USGS. This manuscript is submitted for publication with the understanding that the US Government is authorized to reproduce and distribute prints for Governmental purposes.
Funding was provided by the Upper Mid-west and Great Lakes Landscape Conservation Cooperative, The Nature Conservancy’s Great Lakes Project, The University of Wisconsin, The Great Lakes Fishery Trust, The University of Michigan Water Center, and the Department of Interior Northeast Climate Science Center.
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All authors declare that they have no conflict of interest.
Communicated by Angus Jackson.
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Fitzpatrick, K.B., Moody, A.T., Milt, A. et al. Can indicator species guide conservation investments to restore connectivity in Great Lakes tributaries?. Biodivers Conserv (2020). https://doi.org/10.1007/s10531-020-02084-5
- Surrogate species
- River restoration
- Road culverts