Deja vu all over again

Article Abstract:

The phenomenon of sexual selection and the rapid evolutionary differences in sexual displays of closely related species is explained using a mathematical model. The model is based on the assumption that genetic correlation between preferences and trait is larger than a critical threshold for triggering a runaway and that females with stronger preferences face greater peril. Results suggest that parameters for male's trait value and trait's genetic variance should be included in the equation for male fitness. The potential of mathematical equations in studying phenomenons of natural and sexual selections is discussed.

Models, Natural selection, Sexual behavior in animals, Animal sexual behavior

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The geometry of adaptation

Article Abstract:

The conflict over the magnitude of genetic changes responsible for adaptation continue. H. Allen Orr has shown that adaptation could be based on larger factors than previously thought. Orr considers the entire evolutionary sequence by which a population approaches the optimum, and shows that substitutions continue with a distribution retaining the same form, but with a continually shrinking scale, independent of the dimension n, although assuming a uniform distribution of mutational effects.

Observations, Evolution, Biological research

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Fish found in flagrante delicto

Article Abstract:

Researchers studying cichlid fish in Nicaraguan lakes have discovered evidence of sympatric speciation is taking place. This research hypothesizes the creation of two different species from one species within the same environment.

Natural history, Fishes, Vertebrates, Fish populations, Nicaragua, Speciation

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