Searching for common threads in threadfins: phylogeography of Australian polynemids in space and time
Horne, John B., Momigliano, Paolo, Welch, David J., Newman, Stephen J., and Van Herwerden, Lynne (2012) Searching for common threads in threadfins: phylogeography of Australian polynemids in space and time. Marine Ecology Progress Series, 449 . pp. 263-276.
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View at Publisher Website: http://dx.doi.org/10.3354/meps09557
Proper management of marine fisheries requires an understanding of the spatial and temporal dynamics of marine populations, which can be obtained from genetic data. While numerous fisheries species have been surveyed for spatial genetic patterns, temporally sampled genetic data is not available for many species. We present a phylogeographic survey of the king threadfin Polydactylus macrochir across its species range in northern Australia and at a temporal scale of 1 and 10 yr. Spatially, the overall AMOVA fixation index was Φ(st) = 0.306 (F-st' = 0.838), p < 0.0001 and isolation by distance was strong and significant (r² = 0.45, p < 0.001). Temporally, genetic patterns were stable at a time scale of 10 yr. However, this did not hold true for samples from the eastern Gulf of Carpentaria, where populations showed a greater degree of temporal instability and lacked spatial genetic structure. Temporal but not spatial genetic structure in the Gulf indicates demographic interdependence but also indicates that fishing pressure may be high in this area. Generally, genetic patterns were similar to another co-distributed threadfin species Eleutheronema tetradactylum, which is ecologically similar. However, the historical demography of both species, evaluated herein, differed, with populations of P. macrochir being much younger. The data are consistent with an acute population bottleneck at the last glacio-eustatic low in sea level and indicate that the king threadfin may be sensitive to habitat disturbances.
|Item Type:||Article (Refereed Research - C1)|
All MEPS articles are available online. Articles published 5 years ago or more may be accessed freely by all users. (see http://www.int-res.com/journals/meps/information/#openaccess)
|Keywords:||Australia, pelagic larvae, self-recruitment, metapopulation, genetic drift, Polydactylus macrochir|
|FoR Codes:||06 BIOLOGICAL SCIENCES > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%|
|Deposited On:||11 Jul 2012 19:33|
|Last Modified:||18 Oct 2013 01:32|
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