Quantitative trait loci for upper thermal tolerance in outbred strains of rainbow trout (Oncorhynchus mykiss)

Article Abstract:

Putative quantitative trait loci for heat tolerance have been studied in outbred strains of rainbow trout unselected for the trait using simple-sequence repeat markers associated with upper thermal tolerance (UTT) in backcrosses of lines selected on the trait. The in general stronger marker-trait associations found in male parents may be partially caused by reduced chromosomal recombination rates in male salmonids vs females. Results indicate effects of a QTL on a fitness-related trait in unselected populations of the trout.

Kenya, Fishes, Trout

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Genetic and demographic parameters determining population persistence after a discrete change in the environment

Article Abstract:

Population persistence after a discrete change in the environment has been studied. with the finding that genetic and demographic parameters are determinants. A finite-locus model is especially appropriate for modeling short-term evolution of quantitative traits under strong natural selection. The finite locus model developed is compared to an analytical one and extended to cases that cannot be explained analytically.

Stochastic processes

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High levels of diploid male production in a primitively eusocial bee (Hymenoptera: Halictidae)

Article Abstract:

High levels of diploid male production are discussed based on study in a primitively eusocial bee. Numerous diploid males were found and collected, using allozyme electrophoresis, in natural populations of the bee in southern and central Florida. Interpreted of data was based on the biogeographic history of Florida and the social biology and population dynamics of Halictus poeyi.

Florida, Analysis, Bees, Sex determination, Genetic, Sex determination (Genetics), Biogeography, Hymenoptera, Diploidy

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