Notes of food selection in the Antarctic krill, Euphausia superba |
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Authors: | Krzysztof W. Opaliński Krystyna Maciejewska Ludmila V. Georgieva |
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Affiliation: | (1) Institute of Ecology, Polish Academy of Sciences, Dziekanów Leśny, 05 092 Lomianki, Poland, PL;(2) Marine Fishery Institute, u. Kołłataja 1, 81 332 Gdynia, Poland, PL;(3) Institute of Biology of the Southern Seas, Ukrainian Academy of Sciences, 2 Nakhimova Avenue, 335011 Sevastopol, Crimea, Ukraine, UA |
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Abstract: | Analysis of the gut contents of Euphausia superba and of the phytoplankton composition in the area of the animals catchment served as a basis for answering the question whether or not E. superba is capable of food selection. It was found that the diatom Thalassiosira is preferred by E. superba as a food item and small pennate diatoms, Nitzschia, and Navicula are only tolerated as food. Other algae taxa, such as Tropidoneis, Dactyliosolen, Chaetoceros, and Gyrodinium, are clearly avoided. With respect to phytoplankton cell size, E. superba prefers cells with a length of 20–40 μm and cells larger than 70 μm are rejected. Trophic conditions only slightly affect the food selection of E. superba. Received: 4 September 1995/Accepted: 30 June 1996 |
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