By Stuart West
Recent many years have witnessed an explosion of theoretical and empirical stories of intercourse allocation, reworking how we comprehend the allocation of assets to female and male replica in vertebrates, invertebrates, protozoa, and crops. during this landmark e-book, Stuart West synthesizes the tremendous literature on intercourse allocation, delivering the conceptual framework the sphere has been missing and demonstrating how sex-allocation stories can make clear broader questions in evolutionary and behavioral biology.
West clarifies primary misconceptions within the program of idea to empirical information. He examines the field's successes and screw ups, and describes the learn parts the place a lot vital paintings is but to be performed. West finds how a shared underlying theoretical framework unites findings of sex-ratio edition throughout an important variety of lifestyles types, from malarial parasites and hermaphroditic worms to sex-changing fish and mammals. He indicates how examine on intercourse allocation has been relevant to many severe questions and controversies in evolutionary and behavioral biology, and he argues that sex-allocation examine serves as a key trying out flooring for various theoretical techniques and will aid get to the bottom of debates approximately social evolution, parent-offspring clash, genomic clash, and degrees of selection.
Certain to develop into the defining publication at the topic for the subsequent new release of researchers, Sex Allocation explains why the learn of intercourse allocation presents an incredible version approach for advancing our realizing of the restrictions on edition between all dwelling issues within the average world.
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Extra info for Sex Allocation (Monographs in Population Biology)
The former, supposing the actual number of the offspring to remain constant, would 18 CHAPTER 2 necessarily produce more females, and would therefore be more productive. On the doctrine of chances a greater number of offspring of the more productive pairs would survive; and these would inherit a tendency to procreate fewer males and more females. Thus a tendency towards the equalisation of the sexes would be brought about. . The same train of reasoning is applicable . . if we assume that females instead of males are produced in excess, for such females from not uniting with males would be superfluous and useless.
The observed sex ratio appears to be not significantly different from that predicted in two species (gall thrips Kladothrips rugosus and parasitoid wasp Bracon hebetor), significantly higher in one species (social wasp Polistes metricus), and significantly lower in the other (western flower thrip Frankliniella occidentalis). 3. In F. occidentalis, females can become rapidly sperm depleted, depending on how many times T H E D Ü S I N G - F I S H E R T H E O RY 31 they mate, and older females produced less female biased sex ratios, suggesting that the proportion of constrained females (p) may be higher than that suggested, which would explain why the observed sex ratio is more female biased.
1998; Rosenheim 1999; Ellers et al. 2000). In addition, one study showed a marked preference for the less abundant secondary hosts, as would also be expected under intermediate host and egg limitation (Hunter 1993). 28 CHAPTER 2 The preceding discussion shows that Fisher’s theory coupled with an unusual life history can lead to the prediction of biased sex ratios and that this prediction is supported. However, there has been only limited attention to this area, and there are a number of further complexities that remain to be explored.
Sex Allocation (Monographs in Population Biology) by Stuart West