Sex allocation in animals

Ea, Herre; Eg, Leigh; Ea, Fischer

doi:10.1007/978-3-0348-6273-8_10

Cited by 7 publications

(1 citation statement)

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“…As we have no access to the distribution of S.mansoni in human populations, these data on naturally infested rats are the only we have to estimate k and m, parameters of the aggregation of S. mansoni among its host population. In monogamous hermaphroditic species, resource allocation to female function is likely to be high (Herre et al 1987). Thus, the fecundity of a female is not expected to be greatly increased compared with the fecundity of an hermaphrodite, b is expected to be close to 1.…”

Section: The Modelmentioning

confidence: 99%

The evolution of dimorphism and separate sexes in schistosomes

Després¹,

Maurice

1995

Proc. R. Soc. Lond. B

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The fixation of gonochorism (separate sexes) from an hermaphrodite ancestor in the Schistosomatidae may have been the result of selection for dimorphism, under the particular constraint of having to expel eggs from the vertebrate circulatory system. The hermaphroditic system, which exists in blood parasites closely related to Schistosomatidae, e.g. Spirorchidae and Sanguinicolidae, may result from a weaker constraint caused by the different pathways of egg output, and a weaker aggregation of parasites in the host population that will act against the fixation of gonochorism. The importance of these two factors relative to two others (inbreeding depression and allocation to female function in hermaphrodites) in the evolution of gonochorism in blood parasites is evaluated using an analytical model.

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Section: The Modelmentioning

confidence: 99%