Patterns of animal dispersal, vicariance and diversification in the Holarctic

We analysed patterns of animal dispersal, vicariance and diversification in the Holarctic based on complete phylogenies of 57 extant non-marine taxa, together comprising 170 species, documenting biogeographic events from the Late Mesozoic to the present. Four major areas, each corresponding to a historically persistent landmass, were used in the analyses: eastern Nearctic (EN), western Nearctic (WN), eastern Palaeoarctic (EP) and western Palaeoarctic (WP). Parsimony-based tree fitting showed that there is no significantly supported general area cladogram for the dataset. Yet, distributions are strongly phylogenetically conserved, as revealed by dispersal-vicariance analysis (DIVA). DIVA-based permutation tests were used to pinpoint phylogenetieally determined biogeographic patterns. Consistent with expectations, continental dispersals (WP <----> EP and WN <----> EN) are significantly more common than palaeocontinental dispersals (WN <----> EP and EN <----> WP), which in turn are more common than disjunct dispersals (EN <----> EP and WN <----> WP). There is significant dispersal asymmetry both within the Nearctic (WN --> EN more common than EN --> WN) and the Palaeoarctic (EP --> WP more common than WP --> EP). Cross-Beringian faunal connections have traditionally been emphasized but are not more important than cross-Atlantic connections in our data set. To analyse changes over time, we sorted biogeographic events into four major time periods using fossil, biogeographic and molecular evidence combined with a branching clock'. These analyses show that trans-Atlantic distributions (EN-WP) were common in the Early-Mid Tertiary (70-20 Myr), whereas trans-Beringian distributions (WN-EP) were rare in that period. Most EN-EP disjunctions date back to the Early Tertiary (70-45 Myr), suggesting that they resulted from division of cross-Atlantic rather than cross-Beringian distributions. Diversification in WN and WP increased in the Quaternary (< 3 Myr), whereas in EP and EN it decreased from a maximum in the Early-Mid Tertiary. (C) 2001 The Linnean Society of London.