Abstract
The effects of invasive macrophytes, water level fluctuations and predation on freshwater unionids Pyganodon grandis and Utterbackia imbecillis were studied in three small impoundments in Northeastern Texas in 2003–2005. Mussel density was sampled with quadrats. Mortality, associated with the water level fluctuations and predation, was estimated by collecting dead shells on the shore at about two month intervals. In two ponds, horizontal distribution of unionids was limited by dense beds of invasive and noxious macrophytes (mainly Eurasian watermilfoil Myriophyllum spicatum and American lotus Nelumbo lutea): mussel densities were significantly lower in these macrophyte beds (P < 0.001). In the third pond with the lowest density of macrophytes (stonewort Chara sp.), unionids were distributed more evenly, and the average unionid biomass was the highest among all ponds studied. Vertical distribution of unionids in all ponds was likely limited by low oxygen at depth >2 m. The total amount of shells found on the shore per year varied from 0.1% to 28% of the total population in the pond and was negatively correlated with water level (r = −0.72 to −0.81, P < 0.005). Mammalian predators consumed up to 19% of the total unionid population and predation was facilitated by water level fluctuations.
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Acknowledgements
The research was supported by grant # 434210 “Monitoring of Unionid Populations at Texas Army National Guard (TXARNG) Facility Camp Maxey, Lamar County, Texas” from Texas Army National Guard to AYK and LEB. We would like to thank Dmitry and Vadim Karatayev, and graduate students of the Stephen F. Austin State University (SFASU) Olga Minich and Daniel Bennett for their help during sampling. We thank Dr. James Vankley (SFASU) for identification of M. spicatum, Drs. William W. Gibson, William B. Godwin (SFASU), and reviewers for their valuable comments on the manuscript. We appreciate the help and support of Camp Maxey staff and Dr. Dawn Johnson (TXARNG) throughout the study.
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Burlakova, L.E., Karatayev, A.Y. The effect of invasive macrophytes and water level fluctuations on unionids in Texas impoundments. Hydrobiologia 586, 291–302 (2007). https://doi.org/10.1007/s10750-007-0699-1
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DOI: https://doi.org/10.1007/s10750-007-0699-1