Apryl M. Garcia

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Males of most anuran species (frogs and toads) vocalize to attract mates. However, individuals of many vocal species may also adopt alternative noncalling ''satellite'' tactics. Satellite males characteristically remain in close proximity to calling conspecifics and attempt to intercept incoming females attracted to advertising males. Emerson proposed that(More)
The permeability of isolated sarcoplasmic reticulum (SR) vesicles to monovalent cations was studied using a stopped-flow fluorescence quenching technique that permits the measurement of ion fluxes on a millisecond time scale. Approximately 70% of the SR vesicles carry a cation conductance pathway mediating fluxes of Tl+, K+, Na+, and Li+, but not of(More)
The effects of androgens on male-typical traits suggest that variation among males in circulating levels can play a major role in sexual selection. We examined whether variation in vocal attractiveness is attributable to differences in androgen levels among Great Plains toads (Bufo cognatus). We found that noncalling "satellite" males practicing an(More)
Competition among males for a limited number of females may result in the expression of condition-dependent alternative mating tactics. In such cases, decision rules mediating mating tactic expression are likely to be influenced by a male's external as well as internal environment. For example, experimental studies with anuran amphibians (frogs and toads)(More)
The social environment can alter mating tactic expression through modulatory effects on the endocrine system. In anuran amphibians (frogs and toads), males often adopt noncalling mating tactics in response to increased chorus density, but the underlying physiological factors mediating this response are poorly understood. Recent models suggest that(More)
Body size–age relationships may have important implications for the evolution and maintenance of alternative mating tactics, but these relationships remain largely unexplored in anuran amphibians (frogs and toads). In a single territorial anuran species, smaller noncalling 'satellite' males are younger than calling males. These results have led to the(More)
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