The influence of stream discontinuity and life history strategy on mussel community structure: a case study from the Sabine River, Texas
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The impoundment of running waters is a threat to freshwater mussels and has only been cursorily examined in Texas. To address this, we evaluate mussel assemblage structure in the Sabine River downstream of a flood control and hydropower reservoir. We use the serial discontinuity concept (SDC) and the Life History Continuum model (LHCM) to explain relationships between stream position (i.e., downstream distance from either dam) and mussel species richness, catch-per-unit effort (CPUE), and life history strategy. Using 90th, 85th, and 80th quantile regression models, we observed that mussel species richness and abundance were reduced for stream segments located near Lake Tawakoni and Toledo Bend Reservoir and that these reductions decreased with distance from either reservoir. We also observed significant shifts in life history composition of mussel assemblages depending on stream position from either dam. Opportunistic strategists were more abundant in reaches located immediately downstream of Lake Tawakoni and Toledo Bend Reservoir whereas periodic and equilibrium strategists were most abundant in reaches located at intermediate distances from either reservoir. Findings from this study confirm the negative impact large impoundments have on downstream mussel populations and demonstrate the value of using the SDC and LHCM for evaluating mussel response to river impoundment.
KeywordsFreshwater mussels Unionidae Flow regulation Assemblage structure Impoundment
We thank Mark Cordova, Joe Skorupski, Ben Lundeen, Eric Tsakiris, Melissa Broderick, Ashley Walters, and Bryan Sowards for their assistance in the field. We gratefully acknowledge Ben Bosman and Wendell Haag for valuable comments on earlier drafts of this manuscript. Funding for this project was provided in part by the Texas Parks and Wildlife Department, the United States Fish and Wildlife Service, and the Sabine River Authority.
- Dowell, C. L. & S. D. Breeding, 1967. Dams and Reservoirs in Texas: Historical and Descriptive Information. Texas Water Development Board Report No. 48: 274 pp.Google Scholar
- Federal Energy Regulatory Commission (FERC), 2013. Final environmental impact statement for hydropower license. Toledo Bend Hydroelectric Project No. 2305-036, 304 pp.Google Scholar
- Ford, N. B. & M. L. Nicholson, 2006. A survey of freshwater mussels (Unionidae) of the Old Sabine Wildlife Management Area, Smith County, Texas. Texas Journal of Science 58: 243–254.Google Scholar
- Ford, N. B., J. Gullett & M. E. May, 2009. Diversity and abundance of unionid mussels in three sanctuaries on the Sabine River in northeast Texas. Texas Journal of Science 61: 279–294.Google Scholar
- Graf, W. L., 1999. Dam nation: A geographic census of American dams and their large-scale hydrologic impacts. Water Resources Research 35: 1305–1311.Google Scholar
- Hao, L. & D. Q. Naiman, 2007. Quantile Regression. Sage Publications, Thousand Oaks.Google Scholar
- Howells, R. G., R. W. Neck & H. D. Murray, 1996. Freshwater Mussels of Texas. Texas Parks and Wildlife Press, Austin.Google Scholar
- Howells, R. G., C. M. Mather & J. A. M. Bergmann, 2000. Impacts of dewatering and cold on freshwater mussels (Unionidae) in B.A. Steinhagen Reservoir. Texas. The Texas Journal of Science 52: 93–104.Google Scholar
- McAllister, D., J. Craig, N. Davidson, D. Murray & M. Seddon, 2001. Biodiversity impacts of large dams. Background Paper No. 1. In The International Union for Conservation of Nature, and United Nations Environmental Programme. Gland: 63 pp.Google Scholar
- MacArthur, R. H. & E. O. Wilson, 1967. The Theory of Island Biogeography. Monographs in Population Biology, Vol. 1. Princeton University Press, Princeton.Google Scholar
- Neck, R. W., 1986. Freshwater bivalves of Lake Tawakoni, Sabine River, Texas. The Texas Journal of Science 38: 241–249.Google Scholar
- Neck, R. W., 1990. Geologic substrate and human impact on bivalves of Lake Lewisville, Trinity River, Texas. The Nautilus 104: 16–25.Google Scholar
- National Inventory of Dams (NID), 2014. U. S. Army Corps of Engineers National Inventory of Dams. http://geo.usace.army.mil/pgis/f?p=397:1:0::NO:::.
- Parmalee, P. W. & A. E. Bogan, 1998. The Freshwater Mussels of Tennessee. The University of Tennessee Press, Knoxville.Google Scholar
- R Core Development Team, 2011. R (version 2.11.2): A Language and Environment for Statistical Computing. R Foundation for Statistical Computing, Vienna.Google Scholar
- Randklev, C. R., B. J. Lundeen, J. Skorupski, J. H. Kennedy & S. Wolverton, 2011. Toledo Bend relicensing project: Lower Sabine River mussel study. Final report to Sabine River Authority: 19 pp.Google Scholar
- Randklev, C. R., M. Cordova, J. Groce, E. Tsakiris & B. Sowards, 2014. Freshwater mussel survey (Family: Unionidae) of the lower Sabine River between U. S. Hwy 190 and Orange, Texas. Final report to Texas Parks and Wildlife :37 pp.Google Scholar
- Rogers, W. H., 1992. Quantile regression standard errors. Stata Technical Bulletin 9: 16–19.Google Scholar
- Sabine-Neches Basin and Bay Expert Science Team (Sabine-Neches BBEST), 2009. Environmental flows recommendations report. Final report to Sabine and Neches Rivers and Sabine Lake Bay and Basin and Bay Area Stakeholder Committee, Environmental Flows Advisory Group, and Texas Commission on Environmental Quality, 1215 pp.Google Scholar
- Sabine River Authority (SRA), 2014. Sabine River Authority Projects. www.sratx.org/projects/ibp.asp.
- Stearns, S. C., 1992. The Evolution of Life Histories. Oxford University Press, Oxford.Google Scholar
- Suttkus, R. D. & M. F. Mettee, 2009. Post-impoundment changes in the Cyprinid fauna of the lower Sabine River, Louisiana and Texas. Southeastern Fishes Council Proceedings 51: 1–8.Google Scholar
- Texas Parks and Wildlife Department (TPWD), 2010. Threatened and endangered nongame species. Texas Register 35: 249–251.Google Scholar
- Texas Water Development Board (TWDB), 2012. State water plan. Texas Water Development Board, 314 pp. www.twdb.texas.gov/publications/state_water_plan/2012/2012_SWP.pdf.
- Thorp, J. H., M. C. Thoms & M. D. Delong, 2008. The Riverine Ecosystem Synthesis: Towards conceptual cohesiveness in river science. Academic Press, London.Google Scholar
- U. S. Fish and Wildlife Service (USFWS), 2001. Endangered and threatened wildlife and plants: Review of plant and animal species that are candidates or proposed for listing as endangered or threatened, annual notice of findings on recycled petitions, and annual description of progress on listing actions; proposed rule. Federal Register 66: 54808–54832.Google Scholar
- U. S. Fish and Wildlife Service (USFWS), 2011. Endangered and threatened wildlife and plants: 12-month finding on a petition to list Texas fatmucket, golden orb, smooth pimpleback, Texas pimpleback, and Texas fawnsfoot as threatened or endangered. Federal Register 76: 62166–62212.Google Scholar
- Ward, J. V. & J. A. Stanford, 1983. The serial discontinuity concept of lotic ecosystems. In Fontaine, T. D. & S. M. Bartell (eds.), Dynamics of Lotic Ecosystems. Ann Arbor Science Publishers, Ann Arbor: 29–42.Google Scholar
- Williams, J. D., S. L. H. Fuller & R. Grace, 1992. Effects of impoundments on freshwater mussels (Mollusca: Bivalvia: Unionidae) in the main channel of the Black Warrior and Tombigbee Rivers in western Alabama. Bulletin of the Alabama Museum of Natural History 13: 1–10.Google Scholar
- Williams, J. D., J. T. Garner & A. E. Bogan, 2008. Freshwater Mussels of Alabama and the Mobile Basin in Georgia. The University of Alabama Press, Tuscaloosa, Mississippi and Tennessee.Google Scholar
- Williams, J. D., R. S. Butler, G. L. Warren & N. A. Johnson, 2014. Freshwater Mussels of Florida. The University of Alabama Press, Tuscaloosa.Google Scholar