Phylogeography of Philypnodon species (Teleostei: Eleotridae) across south-eastern Australia: testing patterns of connectivity across drainage divides and among coastal rivers

Christine Thacker, Peter Unmack, Lauren Matsui, Phil Duong, Eric Huang

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20 Citations (Scopus)

Abstract

Phylogeographical studies based on DNA sequences offer insights into intraspecific genetic patterns, elucidating the history and structure of populations and their habitats. We used mitochondrial DNA (cytochrome b) to study the phylogeography and population genetics in two sympatric species in the freshwater fish genus Philypnodon throughout south-eastern Australia. We sought to determine how populations were related across drainage divides, and whether transfer among adjacent coastal drainages was related to continental shelf width or intradrainage distance. Phylogeographical structure was greater in Philypnodon macrostomus Hoese Reader, 2006 compared with Philypnodon grandiceps (Krefft, 1864), with results for P. macrostomus showing evidence for the presence of distinct groupings in different areas of south-eastern Australia. There was evidence of drainage-divide crossings in P. grandiceps in western Victoria, and in P. macrostomus between the Burnett River and the Murray-Darling Basin in south-eastern Queensland. Both species showed low levels of divergence along the narrow continental shelf of New South Wales, but as continental shelf width increased moving north in south-eastern Queensland, population divergence also generally increased. Thus, as the potential riverine connectivity during periods of low sea levels increased, genetic divergences also increased, counter to expectations. Also, population Fst measures did not correlate as predicted with continental shelf width, nor was a significant relationship detected between Fst and the distance between populations.
Original languageEnglish
Pages (from-to)175-192
Number of pages18
JournalBiological Journal of the Linnean Society
Volume95
DOIs
Publication statusPublished - 2008
Externally publishedYes

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phylogeography
connectivity
continental shelf
drainage
rivers
divergence
river
Queensland
Victoria (Australia)
testing
cytochrome b
freshwater fish
sympatry
New South Wales
mitochondrial DNA
population genetics
sea level
cytochrome
population structure
basins

Cite this

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title = "Phylogeography of Philypnodon species (Teleostei: Eleotridae) across south-eastern Australia: testing patterns of connectivity across drainage divides and among coastal rivers",
abstract = "Phylogeographical studies based on DNA sequences offer insights into intraspecific genetic patterns, elucidating the history and structure of populations and their habitats. We used mitochondrial DNA (cytochrome b) to study the phylogeography and population genetics in two sympatric species in the freshwater fish genus Philypnodon throughout south-eastern Australia. We sought to determine how populations were related across drainage divides, and whether transfer among adjacent coastal drainages was related to continental shelf width or intradrainage distance. Phylogeographical structure was greater in Philypnodon macrostomus Hoese Reader, 2006 compared with Philypnodon grandiceps (Krefft, 1864), with results for P. macrostomus showing evidence for the presence of distinct groupings in different areas of south-eastern Australia. There was evidence of drainage-divide crossings in P. grandiceps in western Victoria, and in P. macrostomus between the Burnett River and the Murray-Darling Basin in south-eastern Queensland. Both species showed low levels of divergence along the narrow continental shelf of New South Wales, but as continental shelf width increased moving north in south-eastern Queensland, population divergence also generally increased. Thus, as the potential riverine connectivity during periods of low sea levels increased, genetic divergences also increased, counter to expectations. Also, population Fst measures did not correlate as predicted with continental shelf width, nor was a significant relationship detected between Fst and the distance between populations.",
keywords = "biogeography, continental shelf, freshwater, gobioidei, sea-level change, sympatric species.",
author = "Christine Thacker and Peter Unmack and Lauren Matsui and Phil Duong and Eric Huang",
year = "2008",
doi = "10.1111/j.1095-8312.2008.01000.x",
language = "English",
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journal = "Biological Journal of the Linnean Society",
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T1 - Phylogeography of Philypnodon species (Teleostei: Eleotridae) across south-eastern Australia: testing patterns of connectivity across drainage divides and among coastal rivers

AU - Thacker, Christine

AU - Unmack, Peter

AU - Matsui, Lauren

AU - Duong, Phil

AU - Huang, Eric

PY - 2008

Y1 - 2008

N2 - Phylogeographical studies based on DNA sequences offer insights into intraspecific genetic patterns, elucidating the history and structure of populations and their habitats. We used mitochondrial DNA (cytochrome b) to study the phylogeography and population genetics in two sympatric species in the freshwater fish genus Philypnodon throughout south-eastern Australia. We sought to determine how populations were related across drainage divides, and whether transfer among adjacent coastal drainages was related to continental shelf width or intradrainage distance. Phylogeographical structure was greater in Philypnodon macrostomus Hoese Reader, 2006 compared with Philypnodon grandiceps (Krefft, 1864), with results for P. macrostomus showing evidence for the presence of distinct groupings in different areas of south-eastern Australia. There was evidence of drainage-divide crossings in P. grandiceps in western Victoria, and in P. macrostomus between the Burnett River and the Murray-Darling Basin in south-eastern Queensland. Both species showed low levels of divergence along the narrow continental shelf of New South Wales, but as continental shelf width increased moving north in south-eastern Queensland, population divergence also generally increased. Thus, as the potential riverine connectivity during periods of low sea levels increased, genetic divergences also increased, counter to expectations. Also, population Fst measures did not correlate as predicted with continental shelf width, nor was a significant relationship detected between Fst and the distance between populations.

AB - Phylogeographical studies based on DNA sequences offer insights into intraspecific genetic patterns, elucidating the history and structure of populations and their habitats. We used mitochondrial DNA (cytochrome b) to study the phylogeography and population genetics in two sympatric species in the freshwater fish genus Philypnodon throughout south-eastern Australia. We sought to determine how populations were related across drainage divides, and whether transfer among adjacent coastal drainages was related to continental shelf width or intradrainage distance. Phylogeographical structure was greater in Philypnodon macrostomus Hoese Reader, 2006 compared with Philypnodon grandiceps (Krefft, 1864), with results for P. macrostomus showing evidence for the presence of distinct groupings in different areas of south-eastern Australia. There was evidence of drainage-divide crossings in P. grandiceps in western Victoria, and in P. macrostomus between the Burnett River and the Murray-Darling Basin in south-eastern Queensland. Both species showed low levels of divergence along the narrow continental shelf of New South Wales, but as continental shelf width increased moving north in south-eastern Queensland, population divergence also generally increased. Thus, as the potential riverine connectivity during periods of low sea levels increased, genetic divergences also increased, counter to expectations. Also, population Fst measures did not correlate as predicted with continental shelf width, nor was a significant relationship detected between Fst and the distance between populations.

KW - biogeography

KW - continental shelf

KW - freshwater

KW - gobioidei

KW - sea-level change

KW - sympatric species.

U2 - 10.1111/j.1095-8312.2008.01000.x

DO - 10.1111/j.1095-8312.2008.01000.x

M3 - Article

VL - 95

SP - 175

EP - 192

JO - Biological Journal of the Linnean Society

JF - Biological Journal of the Linnean Society

SN - 0024-4066

ER -