Phenology in Calanus funmarchicus; hypotheses about control mechanisms

Calanus finmarchicus (Gunnerus) stratify narrowly near 500 m depth during their fifth copepodite resting phase in North Atlantic Slope Water off southern New England, USA. They probably achieve this by migration to a specific, daytime isolume. Photoperiod information provided by light intensity at d...

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Bibliographic Details
Main Authors: Miller, Charles B., Cowles, Timothy J., Wiebe, Peter H., Copley, Nancy J., Grigg, Helen
Format: Article in Journal/Newspaper
Language:English
unknown
Published: Inter Research
Subjects:
Calanus finmarchicus
North Atlantic
Online Access:https://ir.library.oregonstate.edu/concern/articles/8910jw12x
Description
Summary:Calanus finmarchicus (Gunnerus) stratify narrowly near 500 m depth during their fifth copepodite resting phase in North Atlantic Slope Water off southern New England, USA. They probably achieve this by migration to a specific, daytime isolume. Photoperiod information provided by light intensity at depth could serve as a cure for termination of the resting phase. Population data on tooth formation and gonad growth show that the resting stock prepares for termination in late winter and matures in February-March. Photoperiods are lengthening throughout that seasonal interval, and might cue arousal. An endogenous, 'long-range' timer that cues arousal after an interval of rest is another possible mechanism.

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