Simulated degradation of phytodetritus in deep-sea sediments of the NE Atlantic (47° N, 19° W).

Poremba, Knut (1994) Simulated degradation of phytodetritus in deep-sea sediments of the NE Atlantic (47° N, 19° W). Open Access Marine Ecology Progress Series, 105 . pp. 291-299.

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Abstract

The degradatlon of phytodetritus In the deep sea was studied in sediment samples of the NE Atlantic In spring and summer 1992 using I4C-labelled algal cells (Anacystis sp , Cyanophyceae) fed to the benthic population in ship-board experiments and measuring the liberation of labelled I4CO2 over time. The mineralization process showed a 2-step behaviour with an initial rapic rate whhich later
slowed down, indicating the initial attack of easily degradable material of the complex food and the later utilization of less labile matter. The profile of degradation activity with sedimend depth showed no clear vertical gradient in March, but in August the activity in the top horizon increased by a factor of 6.1 to 7.8, which was coherent with increased bacterial numbers or biomass (factor of 1.3 to 1.7), respectively, and might be caused by the seasonal input of phytodetritus to the deep-sea bottom. The degradation measured was positively influenced by elevated incubation pressure mostly in summer, indicating that the summer stimulation of microbial activity in 1992 was based on the metabolic activation of the indigenous benthic community while surface-derived organisms attached to sedimented particles were of lesser importance whith respect to consumption of phytodetritus. Several aspects on quality of phytodetritus for nutrition of the deep-sea benthos, seasonality of detritus degradation, and influence
of pressure on microbial activity are discussed

Document Type: Article
Keywords: Bacteria; Deep-Sea; Sediment; Phytodetritus; Barophilism
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-MI Marine Microbiology
Refereed: Yes
Open Access Journal?: No
ISSN: 0171-8630
Expeditions/Models/Experiments:
Date Deposited: 18 Jun 2018 12:34
Last Modified: 18 Jun 2018 12:34
URI: http://oceanrep.geomar.de/id/eprint/43435

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