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Can the extremely female‐biased sex ratio of the social spider mites be explained by Hamilton’s local mate competition model?
Author(s) -
SATO YUKIE,
SAITO YUTAKA
Publication year - 2007
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.2007.00908.x
Subject(s) - biology , sex ratio , haplodiploidy , competition (biology) , spider mite , zoology , ecology , acari , demography , population , sociology
1. Extremely female‐biased sex ratios are known in the social spider mite species, Stigmaeopsis longus and S. miscanthi . Whether Hamilton’s local mate competition (LMC) theory can explain such sex ratios was investigated. 2. Significant changes of the progeny sex ratios in the direction predicted by the LMC model were found in both species when the foundress number changed. Therefore, LMC can partly explain the skewed sex ratios in these species. 3. When the foundress number increased, the progeny sex ratio was still female biased and significantly different from the prediction of the LMC model for haplodiploidy. Relatedness between foundresses could not fully explain the female‐biased sex ratios. Therefore, these results suggest that there are factors other than LMC skewing the sex ratios of these species toward female.