Multiscale Diversity in the Marshes of the Georgia Coastal Ecosystems LTER
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Factors that maintain genetic and species diversity may act in concert in natural ecosystems. Here, we investigate correlations between genetic diversity (in eight salt marsh species) and community species diversity. A significant positive correlation existed between genetic diversity and species richness, although the relationship was not significant for any species individually. Nonetheless, four of the eight comparisons showed strong positive relationships between genetic and species diversity. Additionally, several abiotic variables were used in a model selection procedure to determine what site-level characteristics might drive differences in genetic diversity in this system. The rate of larval influx, as measured by barnacle abundance on Spartina alterniflora, was the strongest predictor of site-level genetic diversity in our samples. Our results suggest that estuarine management efforts should consider recruitment rates when selecting areas for protection.
KeywordsGenetic diversity Species–genetic diversity correlation SGDC Salt marsh GCE-LTER Settlement rate
This material is based upon work supported by the National Science Foundation under grant numbers OCE-9982133 and OCE-0620959. Additional funding was provided by the University of Georgia and the National Geographic Society (NGS grant #8351-07). Thanks to R. Miller, M. Cozad, D. Saucedo, M. S. Pankey, the GCE-LTER Schoolyard program, and field researchers at the University of Georgia Marine Institute (UGAMI) for help with field collections. D. Patel helped with DNA amplification and sequencing. Special thanks to T. Bell, S. Small, and C. Zakas for help in the lab and comments on the manuscript. K. F. Robinson was a great help in data analysis and also provided comments on the paper. Additional helpful comments were graciously provided by two anonymous reviewers. This is a contribution of the Georgia Coastal Ecosystems Long-Term Ecological Research program, and contribution number 985 of the University of Georgia Marine Institute.
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