Abstract
Biotic and abiotic conditions can separately and synergistically influence the abundance and distribution of species and create vertical zonation patterns in marine systems. In Corpus Christi Bay, TX, USA, eastern oysters (Crassostrea virginica) are limited to intertidal habitats, while in adjacent estuaries, oysters not only grow subtidally, but thrive in these areas to the extent they are a viable commercial fishery. The purpose of this study was to assess how predators and abiotic conditions affect oyster mortality and growth at different tidal elevations. Anecdotal evidence suggests that abiotic conditions, primarily hypoxia and salinity, as well as oyster disease, limits oysters to intertidal areas. Yet, in Corpus Christi Bay, oysters are absent from subtidal areas where hypoxia is not known to occur. Infection by Perkinsus marinus (Dermo) is common in the study area, but previous work suggests that infection rates do not increase when oysters are transplanted subtidally. We investigated oyster tidal distributions by transplanting newly settled oysters into intertidal and subtidal areas. Predation on oysters was significantly greater in subtidal as compared to intertidal habitats. When protected from predators using cages, oyster survival significantly increased. Further, oysters in subtidal areas allocated significantly more resources to shell growth than did those in intertidal areas, and oysters are known to grow heavier shells in response to predators. Oyster settlement was not statistically different between inter and subtidal areas, and abiotic conditions measured during the study did not exceed known tolerance limits for oysters. Previous studies have shown that abiotic conditions influence oyster mortality and the success of restored oyster reefs. Our findings indicate that predators can also affect oyster distribution, and their effects should be evaluated when developing plans for oyster management and restoration.
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Acknowledgments
This research was supported by Texas Sea Grant, the Texas Research Development Fund, a TAMU-CC Faculty Enhancement Grant, NSF-MRI Grant #0821215, and the Ruth A. Campbell Professorship to D.L. Smee. Our NSF REU program also provided funding as did the TAMU-CC SOAR program for undergraduate research. The Texas AgriLife Research Mariculture Laboratory in Port Aransas, TX, and the TAMU-CC Center for Coastal Studies provided facilities. The field work would not have been possible without the help of The Marine Ecology Lab at Texas A & M University—Corpus Christi especially P. Torres, E. Robinson and J. Lunt who provided valuable lab assistance. Helpful comments from J. Pollack, P. Montagna, and G. Stunz improved the manuscript.
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Johnson, K.D., Smee, D.L. Predators influence the tidal distribution of oysters (Crassostrea virginica). Mar Biol 161, 1557–1564 (2014). https://doi.org/10.1007/s00227-014-2440-8
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DOI: https://doi.org/10.1007/s00227-014-2440-8