Converse Griffith

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We used field-collected seeds of Arabidopsis thaliana (Brassicaceae) to simulate a colonization event of plants from diverse locations into a common environment to compare regionally "local" and "foreign" populations of this historically mobile species. Life history varied among regional groups, but most variation was found among populations within regions.(More)
  • Kathleen Donohue, Lisa Dorn, +4 authors Johanna Schmitt
  • Evolution; international journal of organic…
  • 2005
Seasonal germination timing strongly influences lifetime fitness and can affect the ability of plant populations to colonize and persist in new environments. To quantify the influence of seasonal environmental factors on germination and to test whether pleiotropy or close linkage are significant constraints on the evolution of germination in different(More)
Colonizing species may often encounter strong selection during the initial stages of adaptation to novel environments. Such selection is particularly likely to act on traits expressed early in development since early survival is necessary for the expression of adaptive phenotypes later in life. Genetic studies of fitness under field conditions, however,(More)
Germination responses to seasonal conditions determine the environment experienced by postgermination life stages, and this ability has potential consequences for the evolution of plant life histories. Using recombinant inbred lines of Arabidopsis thaliana, we tested whether life-history characters exhibited plasticity to germination timing, whether(More)
  • Kathleen Donohue, Lisa Dorn, +4 authors Johanna Schmitt
  • Evolution; international journal of organic…
  • 2005
Germination timing of Arabidopsis thaliana displays strong plasticity to geographic location and seasonal conditions experienced by seeds. We identified which plastic responses were adaptive using recombinant inbred lines in a field manipulation of geographic location (Kentucky, KY; Rhode Island, RI), maternal photoperiod (14-h and 10-h days), and season of(More)
The National Aeronautics and Space Administration (NASA) Infrared Telescope Facility was used to investigate the collision of comet Shoemaker-Levy 9 with Jupiter from 12 July to 7 August 1994. Strong thermal infrared emission lasting several minutes was observed after the impacts of fragments C, G, and R. All impacts warmed the stratosphere and some the(More)
The angular distributions of scattering of 10 and 14Mev neutrons by deuterons have been investigated using photographic emulsions. 1540 deuteron recoils entering the emulsion from a thin target of heavy wax placed in contact with its surface were measured. The results are shown to be in good agreement with the recent theoretical curves of Buckingham,(More)
INTRODUCTION The purpose of this study was to reuse available datasets to conduct an analysis of potential predictors of U.S. Air Force aircrew nonavailability in terms of being in "duties not to include flying" (DNIF) status. METHODS This study was a retrospective cohort analysis of U.S. Air Force aircrew on active duty during the period from 2003-2012.(More)
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