Phenology in Calanus finmarchicus; 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
Published in:Marine ecology. Progress series (Halstenbek) 1991, Vol.72 (1/2), p.79-91
Main Authors: Miller, Charles B., Cowles, Timothy J., Wiebe, Peter H., Copley, Nancy J., Grigg, Helen
Format: Article
Language:English
Subjects:
Calanus finmarchicus
Diapause
Gonads
Marine
Ovaries
Phenology
Photoperiod
Seas
Seasons
Testes
Timing devices
Zooplankton
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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 as cue 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.
ISSN:0171-8630
1616-1599
DOI:10.3354/meps072079