Abstract
SYNOPSIS. Biological oceanographers have traditionally emphasized food and temperature as the most important factors governing the population dynamics of marine copepods. This paper addresses the importance of light and light-dark periods as stimuli for the induction of specific biological processes and activities. Attention is focused on photoperiodic control of dormancy and vertical migration, and the rhythmic expression of daily functions such as the timing of feeding and egg-laying. Emphasis is placed on relating the genetic basis of photoperiodically determined responses and activity rhythms to the population dynamics, ecology and evolution of marine copepods, and the maintenance of diverse zooplankton communities.
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