Gut evacuation rate and grazing impact of the krill Thysanoessa raschii and T. inermis
| Autor: | Kristine Engel Arendt, Torkel Gissel Nielsen, Mette Dalgaard Agersted, Frederik Wolff Teglhus |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
geography
geography.geographical_feature_category Krill Ecology biology digestive oral and skin physiology Thysanoessa raschii Fjord Aquatic Science biology.organism_classification Fishery Animal science Antarctic krill Phytoplankton Grazing Ingestion 14. Life underwater Ecology Evolution Behavior and Systematics |
| Zdroj: | Teglhus, F W, Agersted, M D, Arendt, K E & Nielsen, T G 2015, ' Gut evacuation rate and grazing impact of the krill Thysanoessa raschii and T. inermis ', Marine Biology, vol. 162, no. 1, pp. 169-180 . https://doi.org/10.1007/s00227-014-2573-9 |
| ISSN: | 1432-1793 0025-3162 |
| DOI: | 10.1007/s00227-014-2573-9 |
| Popis: | Gut evacuation rates and ingestion rates were measured for the krill Thysanoessa raschii and T. inermis in Godthåbsfjord, SW Greenland. Combined with biomass of the krill community, the grazing potential on phytoplankton along the fjord was estimated. Gut evacuation rates were 3.9 and 2.3 h−1 for T. raschii and T. inermis, respectively. Ingestion rates were 12.2 ± 7.5 μg C mg C−1 day−1 (n = 4) for T. inermis and 4.9 ± 3.2 μg C mg C−1 day−1 (n = 4) for T. raschii, corresponding to daily rations of 1.2 and 0.5 % body carbon day−1. Clearance experiments conducted in parallel to the gut evacuation experiment gave similar results for ingestion rates and daily rations. Krill biomass was highest in the central part of the fjord’s length, with T. raschii dominating. Community grazing rates from krill and copepods were comparable; however, their combined impact was low, estimated as |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink