Mitochondrial genealogy of Western Australian barramundi: applications of inbreeding coefficients and coalescent analysis for separating temporal population processes

Abstract

In Australian populations of barramundi Lates calcarifer, phylogenetic reconstruction of mtDNA sequences provided evidence of significant historical levels of gene flow, despite the substantial structuring of contemporary populations. The geographical pattern of mtDNA sequences among the populations was not congruent with previous evidence of a major disjunction between western and eastern populations of barramundi in Australia.

DNA barcoding reveals a likely second species of Asian sea bass (barramundi) (Lates calcarifer)

“…This contrasts with two other regions of the mtDNA genome that show appreciable interindividual variation. The control region, in most species highly variable, shows two major clades that are divergent by 3-4% and geographically structured across northern Australia (Chenoweth et al, 1998a;Doup e et al, 1999). The mitochondrial ATPase genes also show two clades but with only 0 Á 47% divergence (Chenoweth et al, 1998b).…”

Genetic diversity and relatedness estimates for captive barramundi (Lates calcarifer, Bloch) broodstock informs efforts to form a base population for selective breeding

“…In this case, broodstock populations would be composed of animals sourced directly from two or more discrete wild stocks (Hartl & Clark 1997). This hypothesis is supported by the findings of previous natural barramundi population genetic studies that suggest the existence of marked stock structure (Keenan 1994(Keenan , 2000Chenoweth, Hughes, Keenan & Lavery 1998a,b;Doup e, Horwitz & Lymbery 1999). When developing breeding strategies for the selective breeding program, knowledge about the source of individuals used for breeding needs to be taken into account.…”

Exposing local adaptation: synergistic stressors elicit population-specific lactate dehydrogenase-B (ldh-b) expression profiles in Australian barramundi, Lates calcarifer

“…High genetic partitioning is present between Australian populations of L. calcarifer (Chenoweth et al 1998;Doupé et al 1999;Keenan 1994Keenan , 2000 due to the non-interconnecting nature of Australian coastal rivers and non-migratory nature of barramundi larvae (Russell and Garrett 1985). Two major genetic clades have been identified between the eastern (Queensland, QLD) and northern (Northern Territory, NT) coasts (Chenoweth et al 1998), as well as a third genetic clade encompassing the west coast (Western Australia, WA; Doupé et al 1999). Moreover, a tropical population (Darwin, NT) was recently shown to maintain swimming equilibrium 66 min longer than a subtropical population (Gladstone, QLD) when subjected to heat-stress (40°C) conditions, indicating population-specific tolerances to upper thermal limits (Newton et al 2010).…”

“…calcarifer is a catadromous, protandrous hermaphrodite native to rivers, estuaries and shallow marine environments throughout the northern half of Australia (25°S-12°S) and the south-eastern Asian archipelago (13°N-10°S). High genetic partitioning is present between Australian populations of L. calcarifer (Chenoweth et al 1998;Doupé et al 1999;Keenan 1994Keenan , 2000 due to the non-interconnecting nature of Australian coastal rivers and non-migratory nature of barramundi larvae (Russell and Garrett 1985). Two major genetic clades have been identified between the eastern (Queensland, QLD) and northern (Northern Territory, NT) coasts (Chenoweth et al 1998), as well as a third genetic clade encompassing the west coast (Western Australia, WA; Doupé et al 1999).…”