TY - JOUR
T1 - Facultative pheromonal mimicry in snakes
T2 - "she-males" attract courtship only when it is useful
AU - Shine, R.
AU - Langkilde, T.
AU - Mason, R. T.
N1 - Funding Information:
Acknowledgments We thank Mike Wall and the Johnson family for assistance and the Australian Research Council for funding.
PY - 2012/5
Y1 - 2012/5
N2 - Males of many animal species mimic females, and thereby deceive rival males. Facultative shifts in posture, color, or movement allow a male using visually-based mimicry to adopt and terminate mimicry rapidly. Pheromonal mimicry is rare in vertebrates perhaps because it is difficult to redeploy pheromones rapidly enough to adjust male tactics to local conditions. In Manitoba garter snakes (Thamnophis sirtalis parietalis), female mimicry benefits males immediately after they have emerged from hibernation. While the snakes are cold and slow, courtship warms them and protects them against predatory crows. This benefit disappears as soon as the snakes are warm. We show that (unlike females) she-male garter snakes attract courting males only when they are cold. Low temperatures may suppress volatility of "less attractive" components of the pheromones (saturated methyl ketones) that she-males use to attract courtship, allowing male snakes to function as transvestites only when this tactic is beneficial.
AB - Males of many animal species mimic females, and thereby deceive rival males. Facultative shifts in posture, color, or movement allow a male using visually-based mimicry to adopt and terminate mimicry rapidly. Pheromonal mimicry is rare in vertebrates perhaps because it is difficult to redeploy pheromones rapidly enough to adjust male tactics to local conditions. In Manitoba garter snakes (Thamnophis sirtalis parietalis), female mimicry benefits males immediately after they have emerged from hibernation. While the snakes are cold and slow, courtship warms them and protects them against predatory crows. This benefit disappears as soon as the snakes are warm. We show that (unlike females) she-male garter snakes attract courting males only when they are cold. Low temperatures may suppress volatility of "less attractive" components of the pheromones (saturated methyl ketones) that she-males use to attract courtship, allowing male snakes to function as transvestites only when this tactic is beneficial.
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U2 - 10.1007/s00265-012-1317-4
DO - 10.1007/s00265-012-1317-4
M3 - Article
AN - SCOPUS:84859731845
VL - 66
SP - 691
EP - 695
JO - Behavioral Ecology and Sociobiology
JF - Behavioral Ecology and Sociobiology
SN - 0340-5443
IS - 5
ER -