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1 June 2011 Dermal Application of Courtship Pheromones Does Not Influence Receptivity in Female Red-Legged Salamanders (Plethodon shermani)
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Abstract
During courtship, adult male plethodontid salamanders transfer protein pheromones that augment female receptivity. The majority of plethodontid species apply pheromones transdermally (to the female's dorsal skin). These pheromones apparently diffuse through the skin and enter into circulation, a unique type of pheromone delivery in vertebrates. In contrast, a behavioral and physiological transition occurred in the Plethodontinae, resulting in one clade of species (Plethodon glutinosus group) that uses a different pheromone delivery mode. Males within this clade apply pheromones directly to the nares of a female, and the pheromones subsequently are detected by the vomeronasal organ. We tested whether female Red-Legged Salamanders (Plethodon shermani), despite normally detecting pheromones via the vomeronasal organ, have retained the ancestral ability to respond to pheromones delivered transdermally. We staged courtship encounters and recorded the behavior of females given either pheromones or control solutions on the dorsal skin. Female receptivity (as inferred from courtship duration) in P. shermani was not affected by dermal application. Also, we used immunocytochemistry on female vomeronasal neurons to show that (1) females responded normally to pheromones delivered to the nares and (2) dermal application of pheromones did not activate vomeronasal neurons. We conclude that female P. shermani are not stimulated by pheromones delivered dermally and infer that this condition may characterize all the members of the P. glutinosus group, which use olfactory pheromone delivery.
Karen M. Kiemnec-Tyburczy, Sarah K. Woodley, Pamela W. Feldhoff, Richard C. Feldhoff and Lynne D. Houck "Dermal Application of Courtship Pheromones Does Not Influence Receptivity in Female Red-Legged Salamanders (Plethodon shermani)," Journal of Herpetology 45(2), (1 June 2011). https://doi.org/10.1670/10-014.1
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