Phylogeography recapitulates topography: very fine-scale local endemism of a saproxylic 'giant' springtail at Tallaganda in the Great Dividing Range of south-east Australia.
Comparative phylogeography can reveal processes and historical events that shape the biodiversity of species and communities. As part of a comparative research program, the phylogeography of a new, endemic Australian genus and species of log-dependent (saproxylic) collembola was investigated using mitochondrial sequences, allozymes and anonymous single-copy nuclear markers. We found the genetic structure of the species corresponds with five a priori microbiogeographical regions, with population subdivision at various depths owing to palaeoclimatic influences. Closely related mtDNA haplotypes are codistributed within a single region or occur in adjacent regions, nuclear allele frequencies are more similar among more proximate populations, and interpopulation migration is rare. Based on mtDNA divergence, a late Miocene-late Pliocene coalescence is likely. The present-day distribution of genetic diversity seems to have been impacted by three major climatic events: Pliocene cooling and drying (2.5-7 million years before present, Mybp), early Pleistocene wet-dry oscillations (c. 1.2 Mybp) and the more recent glacial-interglacial cycles that have characterized the latter part of the Quaternary (<0.4 Mybp).
Department of Genetics and Evolution, Biological Sciences Building 1, La Trobe University, Plenty Road, Bundoora, VIC 3806, Australia. r.garrick@latrobe.edu.au
R C
RC
Garrick
C J
CJ
Sands
D M
DM
Rowell
N N
NN
Tait
P
P
Greenslade
P
P
Sunnucks
D000818:Animals; D001181:Arthropods / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000032:analysis*; D003576:Electron Transport Complex IV / Q000145:classification / Q000235:genetics; D004798:Enzymes / Q000235:genetics; D019143:Evolution, Molecular; D014644:Genetic Variation; D005843:Geography; D006239:Haplotypes; D010802:Phylogeny; D018807:Polymorphism, Single-Stranded Conformational; D021122:Protein Subunits / Q000145:classification / Q000235:genetics; D016415:Sequence Alignment; D013021:South Australia
D004272:DNA, Mitochondrial; D004798:Enzymes; D021122:Protein Subunits; D003576:Electron Transport Complex IV