| Research
Description |
To Hilary Callahan, each organism is a
genotype, the genetic information that it carries in each cell,
inherited from its ancestors. Each organism is also phenotype, an
observable set of morphological, physiological, and behavioral
characteristics that interact with the environment. As a plant
evolutionary ecologist, Dr. Callahan integrates these two
perspectives using the concept of phenotypic plasticity: the
ability of a genotype to express different phenotypes in response
to different environments. She typically focuses on the phenotypic
plasticity of flowering time in the model organism Arabidopsis
thaliana, investigating the fitness benefits and costs of this
plasticity. Although much of her work is conducted in growth
chambers, she works with naturally variable wild populations and
considers field tests essential. |
| Representative
Publications |
Callahan, H. S., and M. Pigliucci. 2002. Shade-induced
plasticity and its ecological significance in wild populations of
Arabidopsis thaliana. Ecology 83:1965-1980.
Callahan, H. S., and D. M. Waller. 2000. Phenotypic integration
and the plasticity of integration in an amphicarpic annual.
International Journal of Plant Sciences 161:89-98.
Callahan, H. S., C. L. Wells, and M. Pigliucci. 1999.
Light-sensitive plasticity genes in Arabidopsis thaliana: mutant
analysis and ecological genetics. Evolutionary Ecology Research
1:731-751.
Callahan, H. S., M. Pigliucci, and C. D. Schlichting. 1997.
Developmental phenotypic plasticity: where ecology and evolution
meet molecular biology. Bioessays 19:519-525.
|
