Evolution and Genetics of Life Histories by Hugh Dingle, Joseph P. Hegmann

By Hugh Dingle, Joseph P. Hegmann

This quantity is the results of a symposium entitled "Variation in lifestyles Histories: Genetics and Evolutionary tactics" subsidized by way of this system in Evolutionary Ecology and behaviour of the college of Iowa and held in Iowa urban on October thirteen and 14, 1980. triggered by way of a up to date upsurge of curiosity within the evolution of existence histories, we selected this subject as a result seen organization among existence historical past qualities and Darwinian healthy­ ness. If such an organization have been to be fruitfully investigated, it is going to require the nearer cooperation of inhabitants and evolutionary ecologists and quantitative and inhabitants geneticists. To motivate such an organization, our symposium had 4 significant goals: first, to facilitate highbrow alternate throughout disciplines between an array of biologists learning lifestyles histories; moment, to motivate exploration of genetic variance and covari­ ance for all times historical past characteristics; 3rd, to contemplate the ecological heritage for genetic vari­ skill; and at last, to facilitate a comparative evaluation either inside of and between species. evidently such wide goals can't be met completely in one quantity, yet we predict we now have succeeded kind of good in offering a consultant and nourishing intel­ lectual dinner party. We see this e-book as a stimulus to the coordination of destiny efforts in a massive and increasing region of inquiry. now we have divided the booklet into six sections.

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Evolution and Genetics of Life Histories

This quantity is the results of a symposium entitled "Variation in existence Histories: Genetics and Evolutionary strategies" backed by means of this system in Evolutionary Ecology and behaviour of the college of Iowa and held in Iowa urban on October thirteen and 14, 1980. triggered via a contemporary upsurge of curiosity within the evolution of lifestyles histories, we selected this subject a result of visible organization among lifestyles historical past characteristics and Darwinian healthy­ ness.

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Progeny broods No significant contrasts Models for Physiological and Genetic Adaptation 45 Table 3-13. Alternative hypotheses for adaptation of Eurytemora affinis to seasonal temperatures Physiological Individual genotypes adapted to range Little genetic variance Genetic Population adapted to entire range Genetic variance maintained Physiological and genetic Each genotype has a range of tolerance Intermediate levels of genetic variance physiological flexibility is maximum at intermediate tolerance levels, or the levels at which heterozygotes would be with largely additive genetic variance.

The specific models are intended to explain how genetic variance in temperature tolerance in Eurytemora is maintained, in the presence of considerable physiological variance. I am assuming that the genetic variance observed in the laboratory is also expressed in the natural environment, particularly because genotype-environment interaction is small or absent. If a particular genotype were adapted to the whole range of temperatures genetic variance would be expected to disappear because of random drift, unless the heterozygote were more homeostatic (Gillespie 1974b).

20, 360-366 (1970). Ketzner, P. : The effect of constant and varying temperature regimes on the genetic and physiological flexibility of the copepod Eurytemora affinis. UnpubI. S. Thesis, Dept. of Biological Sciences, University of Maryland, Baltimore, 1979. Ketzner, P. , Bradley, B. : Rate of environmental change and adaptation in the copepod Eurytemora affinis. Evolution (1982). : Frequency-dependent selection at the esterese-6 locus in D. melanogaster. Proc. NatI. Acad. Sci. (US) 57, 645-649 (1967).

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