Often this type of speciation occurs in three steps ... Research Institute in Panama has been studying this geological event and its effects on populations of snapping shrimp.

Fleischer et al. (1998) used the fact that the Hawaiian Islands are know to have arisen sequentially to put a geologically-based time window on speciation events along the archipelago. Kauai is ...

Random processes/drift. Some models of speciation do not include a role for selection of any sort, but rather invoke a key role for chance events. Such models include speciation by ...

This model of macroevolution is called phyletic gradualism. It proposes that most speciation events are the result of a gradual and uniform transformation of one species into a new one through a ...