Archive for the 'specialist' Category

13 AprThe roles of pre-mating sexual selection and natural selection have less studied.

Variation in size of male genitalia in animals that have internal fertilization has long been of interest. While competitive advantages of sperm robustness and other post – mating sexual selection criteria studied well and posed as evolutionary explanations, the roles of pre-mating sexual selection and natural selection have less studied.

The researchers studied female preference and male swimming performance in these two species of mosquitofish. In laboratory experiments, females preferred to time with videos of men display digitally enlarges gonopodia spend rather than those with average size gonopodia, which means sexual selection for increased size gonopodium. But the researchers also found that men with larger gonopodia were slower potential enemies potential enemies through evasive swimming bursts. Read more…