A Tale of Two Rivers: Implications of Water Management Practices for Mussel Biodiversity Outcomes During Droughts
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Droughts often pose situations where stream water levels are lowest while human demand for water is highest. Here we present results of an observational study documenting changes in freshwater mussel communities in two southern US rivers during a multi-year drought. During a 13-year period water releases into the Kiamichi River from an impoundment were halted during droughts, while minimum releases from an impoundment were maintained in the Little River. The Kiamichi observed nearly twice as many low-flow events known to cause mussel mortality than the Little, and regression tree analyses suggest that this difference was influenced by reduced releases. During this period mussel communities in the Kiamichi declined in species richness and abundance, changes that were not observed in the Little. These results suggest that reduced releases during droughts likely led to mussel declines in one river, while maintaining reservoir releases may have sustained mussel populations in another.
KeywordsDrought Minimum flows Hydrologic alteration Environmental flows Unionoida Freshwater mussel Indicator species
Funding for this project was provided by the Oklahoma Department of Wildlife Conservation (Projects E-12, E-59, T-10, and T-38) and the National Science Foundation (DEB-0211010, DEB-9306687, DEB-9870092, and DBI-1103500). We thank many people who contributed in the field, particularly M. Craig, K. Eberhard, J. Hilliard, D. Partridge, M. Pyron, C. Taylor, and M. Winston in the 1990s; and W. Allen, S. Dengler, D. Fenolio, K. Hobson, D. Morris, and K. Reagan in the 2000s. R. McPherson of the Oklahoma Climatological Survey provided Mesonet data. We thank the Little River Wildlife Refuge for cooperation in establishing sampling sites on managed lands, and private landowners for access to other sampling sites. This is a contribution to the program of the Oklahoma Biological Survey.
- IPCC (International Panel on Climate Change). 2007. Climate change 2007. 4th Assessment Report, 104 pp.Google Scholar
- Isely, F.B. 1924. The freshwater mussel fauna of eastern Oklahoma. Proceedings of the Oklahoma Academy of Science 4: 43–118.Google Scholar
- Liu, L., Y. Hong, C.N. Bednarczyk, B. Yong, M.A. Shafer, R. Riley, and J.E. Hocker. 2012. Hydro-climatological drought analyses and projections using meteorological and hydrological drought indices: A case study in Blue River Basin, Oklahoma. Water Resources Management 26: 2761–2779.CrossRefGoogle Scholar
- Matthews, W.J., C.C. Vaughn, K.B. Gido, and E. Marsh-Matthews. 2005. Southern plains rivers. In Rivers of North America, ed. A.C. Benke and C.E. Cushing, 283–325. Boston, MA: Elsevier.Google Scholar
- Mulholland, P.J., G.R. Best, C.C. Coutant, G.M. Hornberger, J.L. Meyer, P.J. Robinson, J.R. Stenberg, R.E. Turner, et al. 1997. Effects of climate change on freshwater ecosystems of the south-eastern United States and the Gulf Coast of Mexico. Hydrological Processes 11: 949–970.CrossRefGoogle Scholar
- OWRB (Oklahoma Water Resources Board). 2012. Oklahoma comprehensive water plan. http://www.owrb.ok.gov/supply/ocwp/ocwp.php. Accessed 11 Feb 2013.
- Richter, B.D. 2010. Re-thinking environmental flows: From allocations and reserves to sustainability boundaries. River Research and Applications 26: 1052–1063.Google Scholar
- Roy, A.H., M.C. Freeman, B.J. Freeman, S.J. Wenger, W.E. Ensign, and J.L. Meyer. 2005. Investigating hydrologic alteration as a mechanism of fish assemblage shifts in urbanizing streams. Journal of the North American Benthological Society 24: 656–678.Google Scholar
- Sabo, J.L., T. Sinha, L.C. Bowling, G.H.W. Schoups, W.W. Wallender, M.E. Campana, K.A. Cherkauer, P.L. Fuller, et al. 2010. Reclaiming freshwater sustainability in the Cadillac Desert. Proceedings of the National Academy of Sciences of the United States of America 107: 21263–21270.CrossRefGoogle Scholar
- Strayer, D.L. 2008. Freshwater mussel ecology: A multifactor approach to distribution and abundance. Berkeley, CA: University of California Press.Google Scholar
- USACE (United States Army Corp of Engineers). 2010. National inventory of dams. http://geo.usace.army.mil/pgis/f?p=397:1:0. Accessed 11 Feb 2013.
- Vaughn, C.C., and M. Pyron. 1995. Population ecology of the endangered Ouachita Rock Pocketbook mussel, Arkansia wheeleri (Bivalvia: Unionidae), in the Kiamichi River, Oklahoma. American Malacological Bulletin 11: 145–151.Google Scholar