Sex allocation and the evolutionary transition between solitary and gregarious parasitoid development

Article Abstract:

Female Comperiella bifasciata exhibit the sex allocation traits of female-biased sex ratios and single-sex broods which act complementarily to facilitate the evolution of gregarious parasitoid development. This was gleaned from a study of why ovipositing females lay multiple-egg broods, produce female-biased sex ratios and lay mostly single-sex broods when laying more than one egg per host. All-female broods indicate that females benefit more from developing in multiple egg clutches than do males, while single-sex broods enable them to retain control over which sex emerges from a given host.

Sexual behavior, Natural history, Evolution (Biology), Evolution, Parasites, Sex ratio, Females, Hymenoptera

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A generalized model of parasitoid, venereal, and vector-based transmission processes

Article Abstract:

A study considers the behavioral process of disease-vectors and biological process of disease transmission to formulate a general new model for parasitoid, venereal and vector-based disease transmission (VBDT) processes by taking into account both pure-density and pure-frequency dependent parameters for VBDT. It can be conceptually unified for comparative studies on affect of transmission process on population dynamics and for evolution studies of different transmission modes.

Sexually transmitted diseases, Models, Plant diseases, Disease susceptibility, Animal carriers of disease, Vector control, Animals as carriers of disease

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Sex allocation in solitary bees and wasps

Article Abstract:

A model of female:male (F/M) size ratios and F/M sex allocation ratios is developed with the assumptions that the sex of a offspring is controlled according to resources available, the resources used for one offspring are not available for the other and that the link between investment and fitness is not strongly accelerating.

Bees, Solitary wasps, Sex recognition (Zoology), Sexual recognition (Zoology)

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