A phylogeny for the genus Isoodon and a range extension for I-obesulus peninsulae based on mtDNA control region and morphology

Pope, Lisa, Storch, Daryn, Adams, Mark, Moritz, Craig and Gordon, Greg (2001) A phylogeny for the genus Isoodon and a range extension for I-obesulus peninsulae based on mtDNA control region and morphology. Australian Journal of Zoology, 49 4: 411-434.


Author Pope, Lisa
Storch, Daryn
Adams, Mark
Moritz, Craig
Gordon, Greg
Title A phylogeny for the genus Isoodon and a range extension for I-obesulus peninsulae based on mtDNA control region and morphology
Journal name Australian Journal of Zoology
Publication date 2001
Sub-type Article
DOI 10.1071/ZO00060
Volume number 49
Issue number 4
ISSN 0004-959X; 1446-5698
Start page 411
End page 434
Total pages 24
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Collection year 2001
Language eng
Subject C1
270299 Genetics not elsewhere classified
780105 Biological sciences
Abstract Short-nosed bandicoots, Isoodon, have undergone marked range contractions since European colonisation of Australia and are currently divided into many subspecies, the validity of which is debated. Discriminant function analysis of morphology and a phylogeny of Isoodon based on mtDNA control region sequences indicate a clear split between two of the three recognised species, I. macrourus and I. obesulus/auratus. However, while all previously recognised taxa within the I. obesulus/auratus group are morphologically distinct, I. auratus and I. obesulus are not phylogenetically distinct for mtDNA. The genetic divergence between I. obesulus and I. auratus (2.6%) is similar to that found among geographic isolates of the former (I. o. obesulus and I. o. peninsulae: 2.7%). Further, the divergence between geographically close populations of two different species (I. o. obesulus from Western Australia and I. a. barrowensis: 1.2%) is smaller than that among subspecies within I. auratus (I. a. barrowensis and I. auratus from northern Western Australia: 1.7%). A newly discovered population of Isoodon in the Lamb Range, far north Queensland, sympatric with a population of I. m. torosus, is shown to represent a range extension of I. o. peninsulae (350 km). It seems plausible that what is currently considered as two species, I. obesulus and I. auratus, was once one continuous species now represented by isolated populations that have diverged morphologically as a consequence of adaptation to the diverse environments that occur throughout their range. The taxonomy of these populations is discussed in relation to their morphological distinctiveness and genetic similarity.
Keyword Zoology
Mitochondrial Control Region
Southern Brown Bandicoot
Population-structure
Western-australia
Marsupialia
Dna
Size
Peramelidae
Evolution
Sequences
Q-Index Code C1

Document type: Journal Article
Sub-type: Article
Collection: School of Biological Sciences Publications
 
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Created: Tue, 14 Aug 2007, 16:46:02 EST