In phylogeography, an empirical focus on gene lineages enables the history
of population processes to be inferred from the simultaneous analysis of te
mporal and spatial patterns. Rapidly evolving cytoplasmic DNA has been the
empirical workhorse propelling the success of this nascent field. Now, as m
ore sophisticated historical models are being tested, there is a growing ne
ed for phylogeography to expand from a largely marker-specific discipline t
o a more general analytical approach that can be applied across independent
loci. Recent results using nuclear haplotypes to study phylogeography indi
cate that the anticipated technical and biological hurdles can be overcome
in many taxa to achieve phylogeographical comparisons across unlinked loci.
Although many challenges remain, a more complete understanding of the hist
orical, demographic and selective processes shaping phylogeographical patte
rns is emerging.