Studies on a production system using a large volume floating pond
Parker, R.R.; Sibert, J. (1976). Studies on a production system using a large volume floating pond, in: Persoone, G. et al. (Ed.) Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 2. Population dynamics of marine organisms in relation with nutrient cycling in shallow waters. pp. 457-466 In: Persoone, G.; Jaspers, E. (Ed.) (1976). Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 2. Population dynamics of marine organisms in relation with nutrient cycling in shallow waters. European Marine Biology Symposia, 10(2). IZWO/Universa Press: Wetteren. ISBN 90-6281-002-0. 712 pp., more In: European Marine Biology Symposia., more |
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| Abstract | Primary and secondary production was followed in a floating pond supplied with nutrient-rich water from below the halocline and euphotic zone in Alberni Inlet, a fjord in British Columbia. Both inlet- and pond-water were monitored for nitrate, phosphate, chlorophyll and adenosine triphosphate over a 9 day period. The interpreted results suggest that the growth of biomass in the pond became nitrogen limited, after which, at pseudo-steady state, the autotrophic biomass was about 686 mg C/m², and the heterotrophic biomass 288 mg C/m². Net primary production under these conditions was 313 mg C/ m²/day and heterotrophic production was 82 mg C/m²/day. This would indicate that 33% of the net photo-assimilated carbon was being excreted as dissolved organic carbon during this period. The obtained values are considered as minimal because of uncertainty in the C:CHL:ATP ratio used. The conclusion reached is that an efficient system would have to include animals feeding on planktonic heterotrophs as well as on autotrophs and phytodetritus. |
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