The article discusses recent interest in resistance evolution in Drosophila birchii. What's interesting here is the limit on evolved resistance, after 30 years of "intense selection" for desiccation resistance. Here is a little abstract of the article. I found it very interesting and ever so slightly related to what we're studying in class / in the text.
The ability of sensitive rainforest species to evolve in responseto climate change is largely unknown. We show that the Australiantropical rainforest fly Drosophila birchii exhibits clinal variationin desiccation resistance, but the most resistant populationlacks the ability to evolve further resistance even after intenseselection for over 30 generations. Parent-offspring comparisonsindicate low heritable variation for this trait but high levelsof genetic variation for morphology. D. birchii also exhibitsabundant genetic variation at microsatellite loci. The low potentialfor resistance evolution highlights the importance of assessingevolutionary potential in targeted ecological traits and speciesfrom threatened habitats.
Centre for Environmental Stress and Adaptation Research, La Trobe University, Bundoora, Victoria 3086, Australia.