Comparison of diurnal feeding rhythms in Temora longicornis and Centropages hamatus with digestive enzyme activity

Zooplankton samples were collected in St. George's Bay In the Gulf of St. Lawrence, during July, 1981. The level of chlorophyll plus phaeopigment was measured for Centropages hamatus and Temora longicornis collected at three depths every 4–6 h for a 36 h sampling period. The results showed that...

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Bibliographic Details
Published in:Journal of plankton research 1984, Vol.6 (4), p.543-551
Main Authors: Head, E.J.H., Wang, R., Conover, R.J.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Centropages hamatus
Crustacea
Fundamental and applied biological sciences. Psychology
Invertebrates
Marine
Physiology. Development
Temora longicornis
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Summary:Zooplankton samples were collected in St. George's Bay In the Gulf of St. Lawrence, during July, 1981. The level of chlorophyll plus phaeopigment was measured for Centropages hamatus and Temora longicornis collected at three depths every 4–6 h for a 36 h sampling period. The results showed that these species feed predominantly at night. Measurements were also made of the levels of digestive protease, laminarinase and amylase, in samples of animals with either full or empty guts. No significant differences in digestive enzyme acthities could be found suggesting that digestive enzyme levels are not directly related to instantaneous digestion rates. Nevertheless it is likely that feeding rates and digestive enzyme levels are closely linked and a mechanism is proposed here which would explain this apparent inconsistency.
ISSN:0142-7873
1464-3774
DOI:10.1093/plankt/6.4.543