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Comparison of Two Methods of Zooplankton Grazing Measurements

✍ Scribed by Tiina Nőges

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
446 KB
Volume
77
Category
Article
ISSN
1434-2944

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✦ Synopsis

A comparison of two methods of zooplankton feeding experiments was performed in the Gulf of Finland. One was the advanced twin-bathometer method (in sitii technique), the otherthe "bottle method". The main difference between the two methods is that it is not necessary to manipulate zooplankton to start an experiment in a twin bathometer, while manipulation is inevitable if the second method is used. In cases when the onset of the grazing experiment requires the manipulation of animals, the adaptation period lasts 2-4 hours and the optimal duration of experiment is 6-10 hours. If animals are not manipulated at the beginning of experiment, the adaptation period does not exist, the exposition time should not exceed 10 hours and the optimal duration of experiment is 2-4 hours. In long-term experiments (up to 24 hours) the fertilization effect of the excretion of concentrated zooplankton may cause underestimation of grazing rate.

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