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Occurrence, Reproduction, and Population Genetics of the Estuarine Mud Crab, Rhithropanopeus Harrisii (Gould) (Decapoda, Panopidae) in Texas Freshwater Reservoirs

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[The mud crab, Rhithropanopeus harrisii has been found in 10 freshwater impoundments in Texas. Breeding populations were confirmed in eight of these reservoirs by the presence of gravid females, juvenile crabs, and zoeae in the plankton. Salinities varied from a low of 0.5 at Tradinghouse Creek Reservoir to a high of 3.0 at Lake Colorado City. A salinity of 0.5 is considerably below that reported previously for larval survival. Crabs were induced to breed in the lab at a salinity of 1.9 and hatching occurred at salinities as low as 0.5. DNA sequencing of the mitochondrial cytochrome c oxidase I (COI) gene for four reservoir populations revealed the presence of genetic structure and differences in levels of genetic diversity between reservoirs. Potential mechanisms of introduction are addressed. Le crabe Rhithropanopeus harrisii a été trouvé dans 10 bassins de rétention au Texas. Des populations en reproduction ont été confirmées dans 8 de ces réservoirs par la présence de femelles gravides, de crabes juvéniles et de zoés dans le plancton. Les salinités varient d'un minimum de 0,5 au Tradinghouse Creek Reservoir à un maximum de 3,0 au lac Colorado City. La salinité 0,5 est considérablement en dessous de celle reportée pour la survie larvaire. La reproduction des crabes a été induite au laboratoire à une salinité de 1,9 et l'éclosion se réalise à des salinités aussi basses que 0,5. La séquence DNA du gène mitochondrial de la cytochrome c oxydase I (COI) pour 4 populations de réservoirs différents révèle la présence de différences dans la structure génétique et dans les niveaux de diversité génétique entre les réservoirs. Les mécanismes potentiels d'introduction sont discutés., The mud crab, Rhithropanopeus harrisii has been found in 10 freshwater impoundments in Texas. Breeding populations were confirmed in eight of these reservoirs by the presence of gravid females, juvenile crabs, and zoeae in the plankton. Salinities varied from a low of 0.5 at Tradinghouse Creek Reservoir to a high of 3.0 at Lake Colorado City. A salinity of 0.5 is considerably below that reported previously for larval survival. Crabs were induced to breed in the lab at a salinity of 1.9 and hatching occurred at salinities as low as 0.5. DNA sequencing of the mitochondrial cytochrome c oxidase I (COI) gene for four reservoir populations revealed the presence of genetic structure and differences in levels of genetic diversity between reservoirs. Potential mechanisms of introduction are addressed. Le crabe Rhithropanopeus harrisii a été trouvé dans 10 bassins de rétention au Texas. Des populations en reproduction ont été confirmées dans 8 de ces réservoirs par la présence de femelles gravides, de crabes juvéniles et de zoés dans le plancton. Les salinités varient d'un minimum de 0,5 au Tradinghouse Creek Reservoir à un maximum de 3,0 au lac Colorado City. La salinité 0,5 est considérablement en dessous de celle reportée pour la survie larvaire. La reproduction des crabes a été induite au laboratoire à une salinité de 1,9 et l'éclosion se réalise à des salinités aussi basses que 0,5. La séquence DNA du gène mitochondrial de la cytochrome c oxydase I (COI) pour 4 populations de réservoirs différents révèle la présence de différences dans la structure génétique et dans les niveaux de diversité génétique entre les réservoirs. Les mécanismes potentiels d'introduction sont discutés.]

Affiliations: 1: Department of Biology, Texas A&M University, 3258 TAMU, College Station, TX 77840, U.S.A.;, Email: tboyle@mail.bio.tamu.edu; 2: Department of Biological Sciences, Box T-0100, Tarleton State University, Stephenville, TX 76402, U.S.A.

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/content/journals/10.1163/001121610x492148
2010-04-01
2016-12-11

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