As a result of the influential work of Mayr (1963), ideas of speciation were dominated for many years by the importance of allopatry in initiating divergence (Coyne 1994; Howard & Berlocher 1998).
However, populations of these species also occur on other volcanoes, suggesting a potential role for allopatry in the initial divergence of taxa.
The question addressed here is whether species in the Maui Nui clade formed through diversification within the single volcano of East Maui or alternatively whether divergence occurred in allopatry, prior to their current distribution.
macracantha has a population on Lanai as well as East Maui, it is possible that divergence between these two taxa occurred in allopatry.
restricta, divergence in allopatry, and subsequent recolonization of Maui.
The drainage basin where we conducted our study historically had at least 185 fishless lakes >2 ha (Jean Tanguay, Ministere des Ressources naturelles et de la Faune du Quebec, unpubl, data), and is an important area of the Laurentian Highlands for brook trout allopatry
and fishless lakes.