The effects of recurrent clonal formation on clonal invasion patterns and sexual persistence: a Monte Carlo simulation of the frozen niche-variation model

Article Abstract:

A study was conducted to examine the interaction among sexual and asexual organisms in a heterogenous community. The study focuses on clonal invasion patterns and sexual persistence while applying the Monte Carlo method. Results show that nonrandom clonal invasions exist for simulations of uniform resource distributions. In addition, centripetal invasion patterns are observed while sexual persistence was conditioned by simulations of temporal resource fluctuations.

Usage, Biological invasions, Sexual selection in animals, Sexual selection (Natural selection), Monte Carlo method, Monte Carlo methods, Reproduction, Asexual, Asexual reproduction

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Evolution of sex determination in the conchostracan shrimp Eulimnadia texana

Article Abstract:

A model for the population genetics of the conchastracan shrimp, Eulimnadia texana, is developed. Recursive equations describing selection for sex-specific viability as well as sex ratio and reduction of inbreeding are derived. Two equilibrium states are possible. One selects for a population consisting of homozygous hermaphrodites while the other selects for a population consisting of males as well as heterozygous and homozygous hermaphrodites.

Models, Population genetics

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The genetic mechanism of sex determination in the conchostracan shrimp Eulimnadia texana

Article Abstract:

A mechanism for Eulimnadia texana sex determination was developed using laboratory pedigree analysis. Populations of the conchostracan shrimp consist of males and two self-compatible hermaphroditic classes. Amphigenic hermaphrodites can produce both male and hermaphrodite offspring while monogenics can produce only hermaphrodite progenies. The genetic basis of thesesex phenotypes is explained by a two-allele model.

Genetic aspects

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