Increased landscape disturbance and streamflow variability threaten fish biodiversity in the Red River catchment, USA

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dc.contributor.authorMollenhauer, Roberten
dc.contributor.authorMouser, Joshua B.en
dc.contributor.authorRoland, Victor L.en
dc.contributor.authorBrewer, Shannon K.en
dc.date.accessioned2023-06-13T15:12:32Zen
dc.date.available2023-06-13T15:12:32Zen
dc.date.issued2022-09en
dc.description.abstractAim Stream fish distributions are hypothesized to be strongly associated with landscape characteristics at multiple scales. Variation in flow regimes and intensity of landscape disturbance are associated with stream fish distributions; however, relationships are poorly understood in many high-diversity regions. Our objective was to identify occurrence relationships between fish distributions and streamflow and landscape characteristics in the south-central United States. Location Our study area was the central Red River catchment in Oklahoma, Texas and Arkansas, USA. Methods We used existing fish surveys to model the occurrence of a diverse, warmwater assemblage among hydraulic response units (HRUs). We used multispecies occupancy modelling to identify variation in occurrence probability among 111 stream fishes in relation to landscape disturbance and flow regime characteristics. Results We found occurrence relationships with landscape disturbance and 11 metrics comprising all flow-regime components. The relationships varied within both major species groups and some genera. Frequency and duration were the most common metrics underlying flow regime relationships. More common stream fishes tended to be positively associated with higher levels of landscape disturbance and flow regime metrics representing variability; conversely, narrow-ranged fishes tended to be negatively associated. Occurrence relationships with flow metrics representing high-flow events were predominately negative. As expected, many species were strongly associated with ecoregion with landscape disturbance and flow relationships held constant. Main conclusions Our study informs land use and water management decisions and stream fish conservation at multiple spatial scales. Collectively, the findings suggest potential homogenization of the Red River fish assemblage with increased landscape disturbance and streamflow variability. A reduction in landscape disturbance and maintenance of natural flow patterns at coarser scales may benefit endemic and narrow-ranged fishes. Our findings also help guide finer-scale land use and water management decisions by identifying stream network areas with a high occurrence probability of less tolerant fishes.en
dc.description.adminPublic domain – authored by a U.S. government employeeen
dc.description.notesU.S. Geological Surveyen
dc.description.sponsorshipU.S. Geological Surveyen
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1111/ddi.13595en
dc.identifier.eissn1472-4642en
dc.identifier.issn1366-9516en
dc.identifier.issue9en
dc.identifier.urihttp://hdl.handle.net/10919/115416en
dc.identifier.volume28en
dc.language.isoenen
dc.publisherWileyen
dc.rightsPublic Domain (U.S.)en
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/en
dc.subjectBayesianen
dc.subjectexisting dataen
dc.subjectflow regimeen
dc.subjectlandscape disturbanceen
dc.subjectmultispecies occupancy modellingen
dc.subjectstream fishesen
dc.titleIncreased landscape disturbance and streamflow variability threaten fish biodiversity in the Red River catchment, USAen
dc.title.serialDiversity and Distributionsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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