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Science 18 July 1986:
Vol. 233. no. 4761, pp. 359 - 361
DOI: 10.1126/science.233.4761.359
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Articles

Temperature Regulation of Bacterial Activity During the Spring Bloom in Newfoundland Coastal Waters

LAWRENCE R. POMEROY 1 and DON DEIBEL 2

1 Institute of Ecology, University of Georgia, Athens, GA 30602.
2 Newfoundland Institute for Cold Ocean Science, and Marine Sciences Research Laboratory, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1C 5S7.

While the spring phytoplankton bloom in Newfoundland coastal waters is in progress during April and May, at water temperatures between -1° and +2°C, bacterial growth and respiratory rates remain low. Microbial community respiration is not measurable at -0.2°C. Particulate materials that would be utilized by microorganisms in 2 to 3 days at 20° to 25°C require 11 days at 4°C and 18 days at -0.2°C. Thus, photosynthesis is active but microbial utilization of the products is suppressed. High secondary production in cold water may result from the low rate of microbial decomposition, enabling herbivores to utilize much of the primary production.

Submitted on January 31, 1986
Accepted on April 21, 1986


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