speciation

3) Geographic isolation may facilitate cryptic speciation of marine holoplankton.However,contribution of allopatric speciation is still questionable;

Polyploidy is a mechanism often attributed to causing some speciation events in sympatry.

This conclusion agress with the viewpoint that this species is on the speciation stage of migration towards north.

First, there is speciation (species-splitting or cladogenesis), caused by geographical isolation or some other mechanism.

Cook seems to have been the first to coin the term \'speciation\' for the splitting of lineages or \'cladogenesis,\' as opposed to \'anagenesis\' or \'phyletic evolution\' occurring within lineages.

Jolley(1993)is a study of dissolved phosphorus speciation in the lower molongolo sewage treatment plant(Canberra, Australia)detected no triphosphate in raw sewage entering the plant.