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dc.contributor.authorDunn, C.G.
dc.contributor.authorAngermeier, P.L.
dc.description.abstractAim: Conserving stream biota could require strategies that preserve habitats conveying resistance to ecological impacts of changing land use and climate. Retrospective analyses of species’ responses to anthropogenic disturbances can inform such strategies. We developed a hierarchical framework to contrast environmental conditions underlying persistence versus extirpation of an imperilled stream fish, Candy Darter (Etheostoma osburni), over decades of changing land use. The decline of E. osburni may broadly represent the challenge of conserving sensitive freshwater species in intensively used upland environments. Location: New River drainage, Appalachian Mountains, USA. Methods: We surveyed fish and habitat in historically occupied sites to identify population refugia, and used multivariate and spatial analyses to address three questions: (a) what are the environmental correlates of refugia? (b) are the pathways by which land use impacts instream habitat constrained by catchment- and/or segment-scale features? and (c) are E. osburni distributional dynamics spatially structured and explained by fine sediment and warm stream temperatures?. Results: We confirmed a recently localized distribution similar to other upland species, marked by at least seven extirpations from streams throughout E. osburni's southern range. Catchment-scale features primarily constrained land use and finer-scale habitat, leading to either extirpations or population-supporting refugia defined by features at multiple scales. Refugium habitats contained cooler temperatures and less fine sediment. Rare mismatches between persistence and habitat suitability were explained by network location, suggesting unmeasured environmental gradients and/or dispersal contributed to distributional dynamics. Main conclusions: We provided insight at multiple spatial scales into how aquatic species’ distributions become fragmented and localized. Our results demonstrate that natural landscape heterogeneity imparts spatially variable resistance of sensitive species to intensive land uses. By recognizing the scale-specific features that buffer populations from extirpation, conservation strategies could be tailored to protect naturally occurring refugium habitats and focus restoration in systems where such habitats are broadly lacking. © 2018 The Authors. Diversity and Distributions Published by John Wiley & Sons Ltden_US
dc.publisherBlackwell Publishing Ltd
dc.rightsCreative Commons Attribution 4.0 International
dc.subjectCandy Darter
dc.subjectdistributional dynamics
dc.subjectecological resistance
dc.subjectEtheostoma osburni
dc.subjectfine sediment
dc.subjectland use
dc.subjectmultiple stressors
dc.subjectstream temperature
dc.titleRemaining populations of an upland stream fish persist in refugia defined by habitat features at multiple scalesen_US
dc.typeArticle - Refereed
dc.description.notesThis research was partly funded by a State Wildlife Grant from the Virginia Department of Game and Inland Fisheries (VDGIF), and carried out under the auspices of Institutional Animal Care and Use Committee protocol 10‐094‐FIW. We thank M. Pinder, D. Dodge, L. Longanecker, J. Cline, G. Anderson, J. Argentina, A. Villamagna, J. Roberts, B. MogollD? and L. Zseleczky for assistance. Recommendations from Emmanuel Frimpong improved earlier drafts. The Virginia Cooperative Fish and Wildlife Research Unit is jointly sponsored by the U.S. Geological Survey, Virginia Tech,
dc.title.serialDiversity and Distributions

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Creative Commons Attribution 4.0 International
License: Creative Commons Attribution 4.0 International