Speciation often occurs when a habitat becomes more heterogeneous. in lake victoria different species of cichlids are found in different areas of the lake. the best explanation for this speciation is that

Even for a long time, rapid speciation has fascinated the biologists. the study conducted in the recent years shows that the ecological opportunity and sex biased  color differences could actually increases the likelihood of speciation in african fishes. that is what evolution can actually do to our world.