from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The response of an organism to changes in its photoperiod, especially as indicated by vital processes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the growth, development and other responses of plants and animals according to the length of day and/or night
Sorry, no etymologies found.
An often overlooked indicator is what biologists refer to as photoperiodism, or the amount of light in any given day.
My scientific specialty is chronobiology (circadian rhythms and photoperiodism), with additional interests in comparative physiology, animal behavior and evolution.
A fellow working about circadian rhythms and photoperiodism, posted the abstract of Boyd's Dissertation: