The frog population in the Amazon basin varied. every 500 years there was a mutational change leading to speciation. in between the population remained the same with no observable changes. What pattern of macroevlution determined this change?

The frog population in the Amazon basin varied. Every 500 years there was a mutational change leading to speciation. In between the population remainedthe same with no observable changes. The pattern of macroevolution is that there is a change in species orientation and adaptation to change