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January American Naturalist highlights
Date:1/4/2008

lace. In this case, the authors selected on starvation resistance under wet-seasonal conditions.

They discovered that female butterflies had shifted their reproduction from quantity to quality of offspring. Next, they found that males and females had responded differently to the artificial selection: males seemed to have lowered their energy consumption, whilst females had increased the amount of energy to spend. Both results offer interesting details not found previously in comparable experiments using fruit flies, Pijpe states. However, the most important finding was that the artificial selection in a wet seasonal environment had produced butterflies that resembles the long-lived dry season form. Pijpe says: In other words, we targeted genes that are needed to live longer, and the result is very much like how temperature induces butterflies to live longer in the dry season. It suggests that, in this species, the evolution of lifespan is closely associated with phenotypic plasticity. Is it a general mechanism" We think it is likely that the regulation of lifespan involves mechanisms of phenotypic plasticity during development, also in humans.


"An analytically tractable model for competitive speciation"
Pleuni S. Pennings (Ludwig-Maximilians University), Michael Kopp (Ludwig-Maximilians University), Geza Meszena (Eotvos University), Ulf Dieckmann (International Institute for Applied Systems Analysis), and Joachim Hermisson (Ludwig-Maximilians University)

Under which circumstances is sympatric speciation possible" An answer to this long-standing question of evolutionary biology has turned out to be challenging. In particular, models for the evolution of assortative mating under frequency-dependent disruptive selection necessarily depend on a large number of ecological and genetic factors. For this reason, most previous approaches to this issue depend on individual-based simulations. However, simulation studies with
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Contact: Rudy Faust
rfaust@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
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