Journal Article

Tactical Release of a Sexually-Selected Pheromone in a Swordtail Fish

Fitzsimmons, Jessica N., Gerlach, Gabriele, Rosenthal, Gil G., Fisher, Heidi S., Woods, Kristina U.

2011

Overview

Chemical communication plays a critical role in sexual selection and speciation in fishes; however, it is generally assumed that most fish pheromones are passively released since most fishes lack specialized scent glands or scent-marking behavior. Swordtails (genus Xiphophorus) are widely used in studies of female mate choice, and female response to male chemical cues is important to sexual selection, reproductive isolation, and hybridization. However, it is unclear whether females are attending to passively produced cues, or to pheromones produced in the context of communication. We used fluorescein dye injections to visualize pulsed urine release in male sheepshead swordtails, Xiphophorus birchmanni. Simultaneous-choice assays of mating preference showed that females attend to species- and sex-specific chemical cues emitted in male urine. Males urinated more frequently in the presence and proximity of an audience (conspecific females). In the wild, males preferentially courted upstream of females, facilitating transmission of pheromone cues. Males in a teleost fish have evolved sophisticated temporal and spatial control of pheromone release, comparable to that found in terrestrial animals. Pheromones are released specifically in a communicative context, and the timing and positioning of release favors efficient signal transmission.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Animal behavior / Animal Communication / Animal reproduction / Animals / Audiences / Behavior, Animal - physiology / Biology / Carassius auratus / Chemical communication / Chemical stimuli / Choice Behavior - physiology / Cues / Cyprinodontiformes - metabolism / Cyprinodontiformes - physiology / Ecology / Evolution / Female / Females / Fish / Fishes / Fluorescein / Glands / Hostages / Hybridization / Laboratories / Male / Males / Marking behavior / Mate selection / Mating / Morphology / Museums / Oreochromis mossambicus / Pheromones / Preferences / Pulsatile Flow / Reproductive isolation / Sex Attractants - metabolism / Sex Attractants - urine / Sex Characteristics / Sexual behavior / Sexual Behavior, Animal - physiology / Sexual selection / Signal transmission / Speciation / Terrestrial environments / Urination - physiology / Urine / Urology / Visual communication / Xiphophorus / Xiphophorus birchmanni / Xiphophorus pygmaeus / Zebrafish