Heredity 79 (1997) 329—337 Received 2 January 1997 The evolution of sexually selected traits in male swordtail fishes (Xiphophorus: Poeciliidae) AXEL MEYER* Department of Ecology and Evolution, State University of New York, Stony Brook, NY 11794-5245, USA. Sexual rather than natural selection ...
Using morphometric analysis and field collected data on male and female external features, nest characteristics and number of eggs in the nests, we have assessed the development of dimorphic traits in both sexes and male mating success. The results reveal that orbital tentacles of males are more ...
However, no current evidence addresses whether individual changes in immunity (acquired resistance) are reflected in sexual traits. In this experiment I use guppies to compare male orange colour, sigmoid display and female preferences for individual males, before and after a primary challenge infection...
The sexual trait promotion (STP) hypothesis predicts that if male food caches provide supplemental nutrition allowing males to improve their sexual traits (e.g. song) serving a role in female choice, then sexual selection would act on male food caching. To test this idea, we investigated ...
In this scenario, females would be attracted to males on the basis of traits like personality type rather than potential benefits to future offspring. Although multi-species meta-analyses have not found a consistent link between personality traits and reproductive success33, the one published study ...
Using morphometric analysis and field collected data on male and female external features, nest characteristics and number of eggs in the nests, we have assessed the development of dimorphic traits in both sexes and male mating success. The results reveal that orbital tentacles of males are more ...
Testicular and sperm ducts possess very similar structural and enzyme-histochemical characteristics, and play key roles in nutrition of sperm, storage of sperm, synthesis of steroids, secretion of proteins and enzymes, and formation of the seminal plasma [34,35]. Maturation of sperm to acquire ...
The adult males were identified by the presence of a vocal sac and nuptial pad on the first finger, which are secondary sexual characteristics of this species. We measured the snout–vent length (SVL) and body weight as the basic physical information of the individual. The SVL was measured ...