Evol Ecol Res 8: 803-811 (2006) Full PDF if your library subscribes.
Adaptive variation among Drosophila species in their circadian rhythms
Angela Simunovic and John Jaenike*
Department of Biology, University of Rochester, Rochester, NY, USA
Address all correspondence to John Jaenike, Department of Biology, University of Rochester, 213 Hutchinson Hall, Rochester, NY 14627, USA.
Observation: In cool, high latitude regions, Drosophila are often active throughout the day, whereas in lower latitudes, they are most active early and late during the daylight hours.
Question: Is this difference in activity due to variation in the conditions experienced by flies in the wild or their perceptual sensitivity to these conditions, or their genetically encoded circadian rhythms.
Methods: The activity patterns of 11 species of Drosophila were recorded continuously in activity monitors under identical 12 h light/12 h dark conditions.
Results: There was a significant positive correlation between the midday activity of flies and the latitudinal midpoint of the species range, showing that behavioural differences in the wild are at least in part genetically based. An independent contrasts test, correcting for phylogeny, confirmed this correlation. Among species from the same latitudinal region, those that inhabit swampy areas and breed on skunk cabbage have significantly greater midday activity than do mycophagous species. Both the latitudinal and breeding site effects suggest that potential desiccation stress has influenced the evolution of their daily activity patterns.
Keywords: desiccation stress, independent contrasts, latitudinal variation, mycophagous insects.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2006 John Jaenike. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.