Abstract
Species conservation requires a clear understanding of habitat availability and subsequent use of those habitats. In cases where species declines have occurred and gone undetected by conservation managers, habitat alteration, fragmentation, and loss are often the largest contributors. River fragmentation often results in altered flow regimes, subsequently impacting the availability of riverine habitats. Blue sucker (Cycleptus elongatus) is associated with riffle and run habitat, which is especially impacted when river flows are altered. The goal of this research was to identify the extent of blue sucker habitat and mobility of the species in the Colorado River, Texas. To understand habitat selection and use, blue suckers (N = 49) were surgically implanted with telemetry tags. During 2015–2017, thirty-eight attempts were completed to relocate individuals. Optimized hotspot analysis identified three river reaches critical for blue suckers that accounted for 20% of the study area. Blue suckers used these locations year-round including during spawning. Habitats used by blue sucker were composed of gravel, cobble, boulder, and bedrock typically in riffle and run habitat. Mobility, as measured by home range size, increased as riffle density decreased. Larger home ranges were presumably necessary to find habitat to complete aspects of their life history. Results of this study suggest suitable habitats are limited throughout the fragmented riverscape. Conservation action in the form of habitat construction or increased stream connectivity through barrier mitigation could have positive impacts on the future of blue suckers in the lower Colorado River, Texas.
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Acknowledgements
The authors thank Texas Parks and Wildlife for contributing numerous person-hours and use of equipment throughout this study. Dakus Geeslin, Kevin Mayes, the Lower Colorado River Authority, and a number of individuals from Texas A&M University and the University of Texas in addition to the many field technicians from Texas Tech University provided invaluable assistance in the capture, tagging, and tracking of blue suckers. We thank Joey Dyer and the anonymous reviewers for their comments and suggestions which improved upon an earlier draft of this manuscript. This study was completed under the auspices of Texas Tech University Institutional Animal Care and Use Committee protocol # 13085-09 and Texas Parks and Wildlife Scientific Collection Permit SPR-1211-384. Co-operating agencies for the Texas Cooperative Fish and Wildlife Research Unit and the U.S. Geological Survey, Texas Tech University, the Wildlife Management Institute, and the Texas Parks and Wildlife Department. The Hawai’i Cooperative Fishery Research Unit is jointly sponsored by the U.S. Geological Survey, University of Hawai’i System, Hawai’i Department of Land and Natural Resources, and U.S. Fish and Wildlife Service.
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This project was supported by a state wildlife grant (contract # 455345) from U.S. Fish and Wildlife Service and administered by the Texas Parks and Wildlife Department.
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Acre, M.R., Grabowski, T.B., Leavitt, D.J. et al. Blue sucker habitat use in a regulated Texas river: implications for conservation and restoration. Environ Biol Fish 104, 501–516 (2021). https://doi.org/10.1007/s10641-021-01093-9
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DOI: https://doi.org/10.1007/s10641-021-01093-9