Phylogeography recapitulates topography: very fine‐scale local endemism of a saproxylic ‘giant’ springtail at Tallaganda in the Great Dividing Range of south–east Australia

Abstract

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 (

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