Gut evacuation rates and ingestion rates of Eudiaptomus graciloides measured by means of the gut fluorescence method |
| |
Authors: | Christoffersen Kirsten; Jespersen Anne-Mette |
| |
Institution: | Freshwater Biological Laboratory, University of Copenhagen 51 Helsingrsgade, DK-3400 Hillerd, Denmark |
| |
Abstract: | Diel variation in feeding rates of Eudiaptomus graciloides wasmeasured in situ with the gut fluorescence method during Mayand June in the eutrophic Frederiksborg Slotss Pronounced dielperiodicity occurred in both periods with highest feeding ratesduring the night. The food concentration as well as the periodicitywas almost constant with depth, indicating that the feedingactivity represents a behavioral periodicity. The gut evacuationmeasured in the laboratory on field-collected copepods was exponentialand temperature-dependent. The exponential decline in gut contentwas found for both copepods feeding continuously and when feedinghad ceased. Considering spatial and temporal variation in feedingactivity, daily ratios were 6168 body carbon per day,and higher than if calculated from existing laboratory dataof short-term feeding dates. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|