Should attractive individuals court more? Theory and a test

Article Abstract:

Individual differences in attractiveness were incorporated into the theory of condition-dependent sexual selection in a study of courtship behavior of guppies. Large attractive males reduced their courtship under high light levels, supporting the differential cost hypothesis rather than the differential-benefit hypothesis for correlations between sexually selected traits. Bright lights might have exposed large males to predator risk. The discovery that changing environmental conditions can alter the distribution of individual male mating success in guppies has implications for the co-evolution of female choice and sexually selected traits.

Sexual behavior, Fishes, Guppies

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Courtship feeding in katydids (Orthoptera: Tettigoniidae): investment in offspring and in obtaining fertilizations

Article Abstract:

The theory that male katydids provide excess material to safeguard against rapid consumption by hungry females is rejected since the interval of spermatophylax intake was decided by the weight of material supplied by the male and not by the nutritional status of the female. The relationship between the number of sperm and ampulla attachment is discussed.

Health aspects, Analysis, Animal feeding and feeds, Katydids

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