caa a22 4500 465763790 CHVBK 20180323111907.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF00237822 doi (NATIONALLICENCE)springer-10.1007/BF00237822 Heterotrophic activity and bacterial productivity in assemblages of microbes from sea ice in the high Arctic [Elektronische Daten] [Ralph Smith, Pierre Clement] Summary: Heterotrophic activity in the bottom few cm of annual sea ice in the Canadian Arctic was measured throughout the spring bloom of ice algae, using tritium-labelled thymidine and glucose. Experiments with chloramphenicol and cyclohexamide indicated that thymidine assimilation was due to procaryotic microbes but that about half of the glucose assimilation was due to eucaryotic organisms. Glucose and thymidine assimilation rates increased with salinity, from 10 ppt to 30 ppt. Thymidine assimilation rates increased from 1.16 to 4.94·10−21mol·cell−1·h−1 during the latter half of the algal bloom, while the exponential growth rate of the in situ populations decreased from 0.058 to 0.025 d−1. Bacterial production and specific growth rates calculated from thymidine assimilation were 149mgC·m−2 and 0.25 d−1 or less respectively over the 50 day observation period, compared with net primary production of 5,500 mgC·m−2. Thymidine assimilation rates suggested that about half of the bacterial production may be consumed or lost from the ice during the bloom. Springer-Verlag, 1990 Smith Ralph Biological Oceanography Division, Bedford Institute of Oceanography, Box 1004, B2Y 4A2, Dartmouth, Nova Scotia, Canada aut Clement Pierre Biological Oceanography Division, Bedford Institute of Oceanography, Box 1004, B2Y 4A2, Dartmouth, Nova Scotia, Canada aut Polar Biology Springer-Verlag 10/5(1990-05-01), 351-357 0722-4060 10:5<351 1990 10 300 https://doi.org/10.1007/BF00237822 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00237822 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Smith Ralph Biological Oceanography Division, Bedford Institute of Oceanography, Box 1004, B2Y 4A2, Dartmouth, Nova Scotia, Canada aut NATIONALLICENCE 700 1- Clement Pierre Biological Oceanography Division, Bedford Institute of Oceanography, Box 1004, B2Y 4A2, Dartmouth, Nova Scotia, Canada aut NATIONALLICENCE 773 0- Polar Biology Springer-Verlag 10/5(1990-05-01), 351-357 0722-4060 10:5<351 1990 10 300 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer