期刊
JOURNAL OF ETHOLOGY
卷 30, 期 2, 页码 247-254出版社
SPRINGER JAPAN KK
DOI: 10.1007/s10164-011-0317-6
关键词
Competition; Courtship; Sex ratio; OSR; Sexual conflict; Indirect effects; Clutch size
资金
- Alliance for Graduate Education
- National Science Foundation [HRD-0450363, DEB-0128855]
- Ford Foundation
A biased operational sex ratio (OSR) can have multiple, confounding effects on reproductive fitness. A biased OSR can increase harassment and mating activity directed towards potential mates but may also increase the ability of potential mates to choose a good partner if lower quality mates are screened out through competitive interactions. Additionally, a biased OSR may affect reproductive fitness through changes in male ejaculate content or in female reproductive response. We quantified how a male-biased OSR (1:1, 2:1, or 5:1 male to female) affected the size of a female's first egg clutch and her offspring's survivorship in the housefly, Musca domestica. A male-biased OSR increased female fitness: females laid more eggs in their first clutch, had increased offspring survivorship at a 2:1 versus 1:1 OSR, and had equivalent fitness with a 5:1 male to female OSR. Courtship activity increased when the OSR was male-biased but was not a significant predictor of female fitness. Trials where females chose their mates versus trials where a random male was chosen for them had equivalent first clutch sizes and offspring survivorship. These results suggest that there are cryptic effects from a male-biased OSR on female fitness that are most likely driven by pre-copulatory social environment.
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