Evolution of nitrogen fixation in spatially structured populations of Rhizobium

Article Abstract:

Spatially structured populations of Rhizobium and evolution of nitrogen fixation in these populations are discussed. Spatial structure is needed for the evolution of N-fixation. N-fixation is more likely to evolve with increasing degrees of spatial structure. Conditions for coexistence of N-fixing bacteria and nonfixing bacteria expand where there is a saturating relationship between module numbers and N-fixing genotype frequency.

Environmental aspects, Symbiosis, Rhizobium, Nitrogen, Nitrogen fixation, Nitrogen-fixing microorganisms, Mutualism (Biology), Kin selection (Evolution), Nitrogen-fixing plants, Kin selection (Natural selection)

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The evolution of senescence under curtailed life span in laboratory populations of Musca domestica (the housefly)

Article Abstract:

Evolution of senescence has been studied in laboratory populations of Musca domestica with curtailed life span. No evidence for a trade-off between longevity and age age at sexual maturity, developmental time or dry body weight was found, but it appears there was a trade-off between longevity and early progeny production supporting antagonistic pleiotropy.

Aging, Housefly

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Direct and correlated responses to selection on JHE activity in adult and juvenile Gryllus assimilis: implications for stage-specific evolution of insect endocrine traits

Article Abstract:

Implications for stage-specific evolution of insect endocrine traits are discussed relative to direct, correlated responses to selection on juvenile hormone esterase (JHE) activity in adult and juvenile Gryllus assimilis, a cricket. A consistent picture of strong within-stage JHE correlated responses has been seen in either juvenile or adult stages, as have strong correlated responses to selection on JHE activity in different adult periods.

Physiological aspects, Esterases, Natural selection, Insects, Cricket, Cricket (Sport), Juvenile hormones, Endocrinology, Experimental

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