Primary and bacterial production compared to growth and food requirements of Daphnia longispina in Lake Kvernavatnet, west Norway |
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Authors: | B{phi}rsheim, Knut YUngve Andersen, Sissel Hele Johnsen, Geir Eva {phi}, Kambestad Norland, Svein |
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Affiliation: | University of Bergen, Department of Microbiology and Plant Physiology, Allégt 70, N-5000 Bergen,Norway 1University of Bergen, Department of Animal Ecology,Museum of Zoology Muséplass 3, Bergen, Norway |
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Abstract: | Primary production, and bacterial production as measured byincorporation of [3H-methyl]thymidineinto ice cold TCA insolublematerial were investigated during 1984 in Lake Kvernavatnet,west Norway. Primary production averaged 222 mg C m2day1 and bacterial production averaged 163 mg C m2day1. The bacterial production in the euphotic pelagiczonecontributed -60% of the total pelagic bacterial production.The zooplankton was dominated byDaphnia longispina. From growthexperiments with animals fed only natural food in coarse filteredlake water, the population daily growth increments were calculated.The average production of D.longispina was 151 mg C m2day1 during the period investigated. The estimated primaryproduction was too low to sustain both the bacterial productionand the zooplankton food requirements. These results imply thatthe carbon cycle of the lake is dependent on the supply of allochtonousmaterial, or that the current methods for measuring productionrates in aquatic environments are systematical erratic. |
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