Molecular population structure of the marine benthic copepod Microarthridion littorale along the southeastern and Gulf coasts of the USA |
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| Authors: | N. V. Schizas G. T. Street B. C. Coull G. T. Chandler J. M. Quattro |
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| Affiliation: | (1) Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA, US;(2) Baruch Institute, University of South Carolina, Columbia, South Carolina 29208, USA, US;(3) School of the Environment, University of South Carolina, Columbia, South Carolina 29208, USA, US;(4) Department of Environmental Health Sciences, University of South Carolina, Columbia, South Carolina 29208, USA, US |
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| Abstract: | Relationships among populations (southeast Atlantic and northern Gulf coast, USA) of a ubiquitous, estuarine, harpacticoid copepod (Microarthridion littorale Poppe) were estimated using sequence data from two loci: one mitochondrial [cytochrome b (Cyt b)] and one nuclear [first internal transcribed spacer of ribosomal DNA (ITS-1)]. Copepods were collected from seven estuaries in 1997/98. Allelic phylogenies based on both genes were generally concordant, and suggested that M. littorale populations are structured over large geographic scales (hundreds of kilometers). Three well-supported groups were found in both gene trees comprising clades of alleles sampled from South Carolina, Florida, and Louisiana. Alleles from the Savannah, Georgia sample formed a monophyletic group using the Cyt b data, but this clade was not distinguishable with comparable ITS-1 data. A single specimen from Louisiana was classified in different clades depending on the locus assayed. Received: 11 June 1998 / Accepted: 29 April 1999 |
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