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

2010; Brill; Volume: 83; Issue: 4 Linguagem: Inglês

10.1163/001121610x492148

1568-5403

Terrence M. Boyle, Donald E. Keith, Russell S. Pfau,

Isotope Analysis in Ecology

[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 ete trouve dans 10 bassins de retention au Texas. Des populations en reproduction ont ete confirmees dans 8 de ces reservoirs par la presence de femelles gravides, de crabes juveniles et de zoes dans le plancton. Les salinites varient d'un minimum de 0,5 au Tradinghouse Creek Reservoir a un maximum de 3,0 au lac Colorado City. La salinite 0,5 est considerablement en dessous de celle reportee pour la survie larvaire. La reproduction des crabes a ete induite au laboratoire a une salinite de 1,9 et l'eclosion se realise a des salinites aussi basses que 0,5. La sequence DNA du gene mitochondrial de la cytochrome c oxydase I (COI) pour 4 populations de reservoirs differents revele la presence de differences dans la structure genetique et dans les niveaux de diversite genetique entre les reservoirs. Les mecanismes potentiels d'introduction sont discutes., 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 ete trouve dans 10 bassins de retention au Texas. Des populations en reproduction ont ete confirmees dans 8 de ces reservoirs par la presence de femelles gravides, de crabes juveniles et de zoes dans le plancton. Les salinites varient d'un minimum de 0,5 au Tradinghouse Creek Reservoir a un maximum de 3,0 au lac Colorado City. La salinite 0,5 est considerablement en dessous de celle reportee pour la survie larvaire. La reproduction des crabes a ete induite au laboratoire a une salinite de 1,9 et l'eclosion se realise a des salinites aussi basses que 0,5. La sequence DNA du gene mitochondrial de la cytochrome c oxydase I (COI) pour 4 populations de reservoirs differents revele la presence de differences dans la structure genetique et dans les niveaux de diversite genetique entre les reservoirs. Les mecanismes potentiels d'introduction sont discutes.]