Auditory tuning and call frequency predict population-based mating preferences in the cricket frog, Acris crepitans

Article Abstract:

Population-based mating preferences in the cricket frog (Acris crepitans) were investigated. The mean male call frequency (MCF) and the mean frequency sensitivity (MFS) of females were determined. Analysis of the relationship between MCF and MFS showed that females could respond to local or foreign calls, and that they are tuned to frequencies below the mean of their population. Within the same population, larger females preferred lower frequencies while smaller ones preferred higher frequencies. Thus, female preferences could select for call frequency and for call frequency variation.

Sexual behavior, Analysis, Frogs, Courtship of animals, Mating behavior, Sound production by animals, Animal vocalizations

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Character definitions, sexual selection, and the evolution of swordtails

Article Abstract:

The developmental investigations of the Xiphophorus caudal fin are differentiated by the researcher's concept and phylogenetic evaluation of the sword-like feature of the fish. A study attributing this trait evolution to the prejudiced unproved theory of sexual selection, which foretells that the emergence of the male distinguishing characteristic is spurred by growing female favoritism, is defied by a recent phylogenetic study that employed DNA sequencing.

Phylogeny, Fins, Fins (Anatomy)

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A genetic polymorphism in the swordtail Xiphophorus nigrensis: testing the prediction of equal fitnesses

Article Abstract:

Size polymorphism in the male population of swordtails is genetically controlled by a single locus on the Y chromosome. The equality of fitnesses of small and large morphs is determined by constructing a model to calculate the per capita death rate based on mating success and ages at sexual maturity. Under equilibrium condition, equality of fitnesses between the different-sized morphs is found to exist.

Physiological aspects, Genetic aspects, Genetic polymorphisms, Dimorphism (Animals), Dimorphism (Biology)

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