Multivariate analysis of male mating success on morphometric traits and chromosome dosage in the grasshopper Sinipta dalmani

Article Abstract:

Multivariate analysis has been carried out relative to male mating success in the grasshopper Sinipta dalmani. the analysis deals with on morphometric traits and chromosome dosage. The conclusions were the same when linear and logistic multiple regression were used on the first three components of PCA analyses. Differences in some body size traits seem to be determined by the karyotype. Of these, length of the third tibia gives the best contribution to variation in fitness. Selective effects detected on chromosome dosage and other morphological trains are indirect and caused by correlated effects.

Usage, Multivariate analysis, Cell adhesion molecules, Natural selection, Locusts, Locusts (Insects), Inversion (Genetics)

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Negative genetic correlation between traits of the Drosophila head, and interspecific divergence in head shape

Article Abstract:

The pattern of divergence of two sibling species of cactophilic Drosophila was studied for traits known to be negatively correlated in other Drosophila species, face width (FW) and width of both eyes (EW). Head width (HW) equals the sum of FW and EW. Overall findings are support genetic correlation-related constraints on the pattern of interspecific differentiation.

Statistical Data Included, Physiological aspects, Developmental biology, Phenotype, Phenotypes, Drosophila, Heredity, Morphology (Animals), Animal morphology

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Female mating behaviour, sexual selection and chromosome 1 karyotype in the seaweed fly, Coelopa frigida

Article Abstract:

Mate choice in female seaweed flies is affected by pleiotropic factors of selection. Willingness to mate is not, contrary to evolutionary theory, always made on the basis of improving the fitness of female flies' offspring. Mate choice for large male size was found to vary between two inversion homokaryotypes in several families.

Behavior, Flies, Diptera, Sexual selection in animals, Sexual selection (Natural selection)

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