The frogs in the isolated southern area had a distinctive mating call due to female choices and mating preferences.
How do female choices lead to changes in mating calls?
- When observing the frogs from the North and South, it was found that females pay special attention to the male mating calls.
- This includes call's duration, note rate and dominant frequency.
- Despite this these frogs can interbreed among each other.
- It is found that when the frogs from two different populations of the North and South established contact less than 8,000 years ago, the offspring from interbreeding were less viable.
- Therefore the females choose frogs from their own lineages to promote the health of their offspring.
- The southern females are pickier about their mates than the northern females such that they never mate with the northern males.
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