ritchie-differingimpact-2014.pdf (1.88 MB)
Differing impact of a major biogeographic barrier on genetic structure in two large kangaroos from the monsoon tropics of Northern Australia
journal contribution
posted on 2014-03-01, 00:00 authored by M D Eldridge, S Potter, C N Johnson, Euan RitchieEuan RitchieTropical savannas cover 20-30% of the world's land surface and exhibit high levels of regional endemism, but the evolutionary histories of their biota remain poorly studied. The most extensive and unmodified tropical savannas occur in Northern Australia, and recent studies suggest this region supports high levels of previously undetected genetic diversity. To examine the importance of barriers to gene flow and the environmental history of Northern Australia in influencing patterns of diversity, we investigated the phylogeography of two closely related, large, vagile macropodid marsupials, the antilopine wallaroo (Macropus antilopinus; n = 78), and the common wallaroo (Macropus robustus; n = 21). Both species are widespread across the tropical savannas of Australia except across the Carpentarian Barrier (CB) where there is a break in the distribution of M. antilopinus. We determined sequence variation in the hypervariable Domain I of the mitochondrial DNA control region and genotyped individuals at 12 polymorphic microsatellite loci to assess the historical and contemporary influence of the CB on these species. Surprisingly, we detected only limited differentiation between the disjunct Northern Territory and QueenslandM. antilopinus populations. In contrast, the continuously distributedM. robustus was highly divergent across the CB. Although unexpected, these contrasting responses appear related to minor differences in species biology. Our results suggest that vicariance may not explain well the phylogeographic patterns in Australia's dynamic monsoonal environments. This is because Quaternary environmental changes in this region have been complex, and diverse individual species' biologies have resulted in less predictable and idiosyncratic responses.
History
Journal
Ecology and EvolutionVolume
4Issue
5Pagination
554 - 567Publisher
John WileyLocation
EnglandPublisher DOI
ISSN
2045-7758eISSN
2045-7758Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, The AuthorsUsage metrics
Keywords
Macropus antilopinusMacropus robustusNorthern Australiamicrosatellitesmitochondrial DNAphylogeographytropical savannawallarooScience & TechnologyLife Sciences & BiomedicineEcologyEnvironmental Sciences & EcologyMITOCHONDRIAL-DNAPOPULATION-GENETICSMAXIMUMCONSERVATIONBUTCHERBIRDMARSUPIALIACARPENTARIADIVERGENCEQUATERNARYEvolutionary BiologyLANDSCAPEINFERENCEEvolutionary BiologyEcology
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC