Sperm traits in relation to male amplexus position in the Omei treefrog Rhacophorus omeimontis, a species with group spawning.

The article presents a study using the predictions of the sperm competition theory to see if these can be applied to the polyandrous Omei treefrog (Rhacophorus omeimontis). The theory predicts that subordinate males may experience a higher intensity of sperm competition than dominant males resulting, in larger testes, larger sperm and greater longevity. Findings showed that small males do not invest more in sperm than large males and that they do not have larger sperms or greater longevity.