PMID: 30024675Mar 1, 2017Paper

Female mate choice, male-male competition, and male sexual traits: Experimental study of sexual selection directedness in Campbell's dwarf hamster (Phodopus campbelli Thomas 1905)

Zhurnal obshcheĭ biologii
N Yu VasilievaK A Rogovin

Abstract

We studied the relationship between female mate choice and male-male competition in Campbell's dwarf hamster. Sexually motivated (SM) females chose between two tethered male siblings that differed in expression of sexual traits. Males were unrelated to the female and able to contact and copulate with her. The same males were used in encounter experiment with the following free access of competing male to another SM female. We measured males' sex-related morphology of body mass, mid-ventral specific skin gland, ano-genital distance, and external testicular diameter. We also estimated levels of blood testosterone and cortisol, specific T- and B-cell immune responses to antigens, as well as aggressive and sexual dominance. We found out that female mate choice was not dependent on male aggressive and sexual dominance estimated through encounter experiments. Both in female mate choice and male-male competition experiments (encounter of males and free excess of males to receptive female) successful males did not differ from unsuccessful males in expression of sexual traits (ST). Among males with higher expression of ST mate choice by the female was not associated with aggressive dominance and sexual dominance of a male. There were no...Continue Reading

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