Could sex be maintained through harmful males?

Article Abstract:

A study for modeling the competition between sexual and asexual individuals within a population have shown that a small competitive advantage of sexual individuals can recoup a large reproductive advantage of parthenogenetic ones. The result shows that even if parthenogenetic individuals had twice the birth rate and no higher death rate in the absence of competition, a slightly higher impact of sexual individuals on asexual ones can suffice to compensate their reproductive disadvantage.

Germany, Sexual behavior, Genetic aspects, Arthropoda, Arthropods

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Can adaptation lead to extinction?

Article Abstract:

The study shows mathematical models drawing from a diverse range of systems predict that individual selection can lead to the extinction of the whole population, a phenomenon which has become known as evolutionary suicide, due to the complexity of both following adaptation and determining the exact cause of an extinction, evolutionary suicide has remained untested. However studies suggest that suicide should be taken as a potentially important evolutionary phenomenon.

Finland, Biological research, Biology, Experimental

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Decreased reproductive investment of female threespine stickleback Gasterosteus aculeatus infected with the cestode Schistocephalus solidus: Parasite adaptation, host adaptation, or side effect?

Article Abstract:

The somatic energy reserves, maturation stage and ovarian mass of female sticklebacks (Gasterosteus aculeatus) collected from an Alaska lake during a single reproductive season were analyzed when parasitized by Schistocephalus solidus. It was found that parasitized females were less likely to carry fully-matured gametes, had smaller ovarian masses and had lower somatic energy stores than unparasitized females.

United States, Physiological aspects, Diseases, Three-spined stickleback

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