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PLoS One
2015 Apr 22;104:e0125981. doi: 10.1371/journal.pone.0125981.
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Leptin Manipulation Reduces Appetite and Causes a Switch in Mating Preference in the Plains Spadefoot Toad (Spea bombifrons).
Garcia NW
,
Pfennig KS
,
Burmeister SS
.
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Condition- or context-dependent mate choice occurs when females modify their mate preferences depending on their internal or external environment. While the ecological and evolutionary factors that favor the evolution of such plasticity are emerging, relatively little is known of the mechanisms underlying such choice. Here we evaluated whether leptin, a protein hormone involved in the regulation of appetite, might affect the expression of condition-dependent mate choice decisions. To do so, we administered leptin to spadefoot toads, Spea bombifrons, which exhibit condition-dependent mate choice for males of their own species versus congeneric males of S. multiplicata. In particular, poor-condition S. bombifrons are more likely than are good-condition S. bombifrons to prefer S. multiplicata males, but only in environments where hybridization between the two species is beneficial. We found that our leptin treatment reduced appetite in S. bombifrons adults, as was expected from leptin's known effects on appetite. However, although we predicted that leptin would reduce female preferences for heterospecific males, we found the opposite. In particular, our leptin treatment generated a consistent, repeatable preference for heterospecifics in an environment where females generally prefer conspecifics regardless of condition. These results indicate that leptin has the potential to affect female mate choice, but that it might do so in non-intuitive ways.
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Fig 2. Percentage of female S. bombifrons that chose conspecific versus heterospecific male calls when treated with saline or leptin.Asterisks indicate significant differences from the random expectation of 50% (indicated by dashed line), while the bar indicates a significant difference in the preferences between saline- and leptin-treated females in deep water.
Fig 1. Cumulative attacks (+/- S.E.M.) on cricket prey over time for saline- and leptin-treated female S. bombifrons.Leptin-treated females attacked prey significantly less than saline-treated females.
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