The effect of visual obstructions on the sexual behaviour of guppies Essay

The effect of visual obstructions on the sexual behaviour of guppies - Essay Example Therefore, in order to gain a better understanding of the evolution of specific, elaborate secondary sexual characteristics, it is important to study the ecological factors and behavioral mechanisms that may influence the outcome of sexual selection. These changes may therefore affect the evolutionary outcome of sexual selection. This paper summarizes the published article by Hibler and Houde entitled â€Å"The effect of visual obstructions on the sexual behavior of guppies: the importance of privacy†. The research team examined the effect of habitat structure on the sexual behavior of male and female guppies, Poecilia reticulata. The team tested whether the ability of males to observe the courtship activities of other males affects the frequency of courtship interference by male guppies, and whether this in turn affects the sexual behavior of virgin females interacting with these males. They tested these predictions by manipulating the structure of guppy habitats in the laboratory using opaque barriers and observing the effect of such visual obstructions on male courtship and interference behavior, as well as on female sexual responsiveness to male displays in experimental groups of guppies. The results of the experiments were scored and the interference behaviors as either ‘fend-offs’ or ‘chases’. Data for male groups that were tested with both virgin and non-virgin females were analyzed using ANOVA to determine the effect of both treatment and reproductive status (virgin versus non-virgin) on male display and interference behaviors with male group as a blocking factor. For trials involving non-virgin females, ANOVAs containing an order effect were also carried out for chases, fend-offs and displays. The results of this study support the original predictions made by the study group that visual obstructions reduce male interference behavior and increase female responsiveness