Population genetic structure of the brown tiger prawn, Penaeus esculentus, in tropical northern Australia |
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Authors: | Robert D Ward Jennifer R Ovenden Jennifer R S Meadows Peter M Grewe Sigrid A Lehnert |
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Institution: | (1) CSIRO Marine and Atmospheric Research, GPO Box 1538, Hobart, TAS, 7001, Australia;(2) Molecular Fisheries Laboratory, Southern Fisheries Centre, Agency for Food and Fibre Sciences (Fisheries and Aquaculture), PO Box 76, Deception Bay, QLD, 4508, Australia;(3) CSIRO Livestock Industries, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia, QLD, 4067, Australia |
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Abstract: | Eight polymorphic microsatellite loci were analysed in six population samples from four locations of the Australian endemic
brown tiger prawn, Penaeus esculentus. Tests of Hardy–Weinberg equilibrium were generally in accord with expectations, with only one locus, in two samples, showing
significant deviations. Three samples were taken in different years from the Exmouth Gulf. These showed no significant heterogeneity,
and it was concluded that they were from a single panmictic population. A sample from Shark Bay, also on the west coast of
Australia, showed barely detectable differentiation from Exmouth Gulf (F
ST = 0 to 0.0014). A northeast sample from the Gulf of Carpentaria showed low (F
ST = 0.008) but significant differentiation from Moreton Bay, on the east coast. However, Exmouth Gulf/Shark Bay samples were
well differentiated from the Gulf of Carpentaria/Moreton Bay (F
ST = 0.047–0.063). The data do not fit a simple isolation by distance model. It is postulated that the east–west differentiation
largely reflects the isolation of east and west coast populations that occurred at the last glacial maximum when there was
a land bridge between north-eastern Australia and New Guinea. |
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