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RATES OF ATTACK AND CONTROL OF THE OFFSPRING SEX RATIO IN THE PARASITIC WASP LARIOPHAGUS DISTINGUENDUS IN AN ENVIRONMENT WHERE HOST QUALITY VARIES by G. SIMBOLOTTI1), F. A. PUTTERS and J. VAN DEN ASSEM2) (Zoological Laboratory, Division Ethology, University of Leiden, P.O. Box 9516, 2300 RA Leiden, The Netherlands) (With 11 Figures) (Acc. 1-III-1986) Introduction Problems of sex allocation have played an important role in theorizing about the factors which direct evolution (CHARNOV, 1978, 1979, 1982; STUBBLEFIELD, 1980), and they continue to do so. Indeed, sex allocation represents one of the most fruitful blends of theory and observation in all of evolutionary biology (LEIGH et al., 1985), although, no doubt, empirical data lag behind, considering the recent flourish of theories. This paper is a contribution to the collection of empirical data in the first place; we will address a sex-allocation problem in the form of decisions on the ratio of male to female offspring by a parasitic wasp. The theory of natural selection predicts that animals behave in such a way as to maximize reproductive success. This implies the ability to make the most profitable decisions at the appropriate times. Because trade-offs are always involved, optimization procedures have
Behaviour – Brill
Published: Jan 1, 1987
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