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Field studies of DCMU-enhanced fluorescence as an index of in-situ phytoplankton photosynthetic activity
0LR(1980)27(12)
E. Biological Oceanography
80:6079 Konovalova, G. V., 1980. Nannoplankton of the intensive upwelling in the coastal waters of Peru. (In Russian; English abstract.) Biol. mot., Akad. Nauk SSSR, 1980(1): 43-47. Reverse-flow filtration identified 31 nannoplankton species with numbers increasing seaward and biomass increasing from the center to the periphery of the upwelling; maximum densities occurred at 0-20 m depth. The continental slope was dominated by diatoms whereas peridineans and flagellates prevailed over the shelf. Group of Productivity, Department of Hydrobiology, Institute of Marine Biology, Far East Science Center, Academy of Sciences of the U.S.S.R., Vladivostok, U.S.S.R. (izs) 80:6080 Laws, E. A. and T. T. Bannister, 1980. Nutrientand light-limited growth of Thalassiosira fluviatilis in continuous culture, with implications for phytoplankton growth in the ocean. Limnol. Oceanogr., 25(3): 457-473.
Bannister's model describing nutrient-saturated growth fit the light-limited data well, and could also be extended to fit nutrient-limited growth. Dark C loss rates were I0 to 20/~ of daytime production (at ~0.25/day). Chl a:C ratiosand dilution rate were linearly related under nutrient limitation, while productivity indices were a hyperbolic function of dilution rate. 'N :C ratioswere linearly correlated with dilutionrate under both light and nutrient limitation, but with the regressions having opposite signs.' D e p a r t m e n t of Oceanography, University of Hawaii, Honolulu, Hawaii 96822, U.S.A. (mjj) 80:6081 Nair, V. R., 1980. Production and associations of zooplankton in estuarine and nearshore waters of Goa [western India]. Indian J. mar. Sci., 9(2): 116-119. Zooplankton production peaks occurred in November and March/April in the two estuaries and nearshore waters; nearshore mean secondary production was 136 m g C / m 2/day, more than twice that of the estuaries. Crustaceans were the primary scavengers; chaetognaths and coelenterates dominated the predators. Communities originated with filter feeders and omnivores, followed by increasing numbers of predators. Includes a species list. National Institute of Oceanography, Dona Paula, Goa 403 004, India. (slr) 80:6082 Paasche, E. and I. Ostergren, 1980: The annual cycle of plankton diatom growth and silica
893
production in the inner Oslofjord. Limnol. Oceanogr., 25(3): 481-494. Biogenic silica concentrations varied from 2-324 ug Si • L - ~during the year with highest amounts present during diatom blooms, particularly in June. Depletion times of dissolved Si at bloom peak were as short as 3 h and amounts were as much as 20 times less than the biogenic Si present; however, there were no signs of extreme silica shortage (Skeletonema costatum cells were slightly less silicified during the May and June peak, to no apparent harm). Includes 4 Skeletonema costatum micrographs. Department of Marine Biology and Limnology, University of Oslo, P.O. Box 1069, Blindern, Oslo 3, Norway. (sir) 80:6083 Parsons, T. R., L. J. Albright, J. Parslow, M. J. R. Clark, R. W. Drinnan (comments), J. G. Stockner, K. S. Shortreed and E. A. MacIsaac (reply), 1980. [Discussion of] 'Phytoplankton ecology of the Strait of Georgia, British Columbia.' Can. J. Fish. aquat. Sci., 37(6): 1043-1055. Revelante, Noelia and Malvern Microplankton diversity d i ~ t o r s of' eutrophication Adriatic Sea. Hydrobiologia,
80:6084 Gilmartin, 1980. indie~ as inin the northern 70(3): 277-286.
A derived Shannon diversity frequency spectrum provided a single biological quantification which allowed an interpretation of temporal and regional differences (and which can also be used to evaluate future changes in species diversity). The data base comprised a 4+ year time series involving 300 taxa. Department of Oceanography, University of Maine, Orono, Maine 04469, U.S.A. 80:6085 Roy, Suzanne and Louis Legendre, 1980. Field studies of DCMU-enhance¢l fluorescence as an index of in-situ phytoplankton photosynthetic activity. Can. J. Fish. aquat. Sci., 37(6): 1028-1031. N o overall correlation could be established between the specific photosynthetic rate (P/B :photosynthetic activity per unit chlorophyll a) and the increase in fluorescence caused by D C M U (Fv/FN), although there were significant correlations on short transects. Fv/FN profilesin the Gulf of St. Lawrence and the Gulf of Guinea showed a characteristic increase with depth. Technical problems involving the use of Fv/F~ as an estimator of P / B are discussed. Department of Oceanography, Dalhousie University, Halifax, N.S. B 3 H 4J1, Canada. (mjj)
E. Biological Oceanography
80:6079 Konovalova, G. V., 1980. Nannoplankton of the intensive upwelling in the coastal waters of Peru. (In Russian; English abstract.) Biol. mot., Akad. Nauk SSSR, 1980(1): 43-47. Reverse-flow filtration identified 31 nannoplankton species with numbers increasing seaward and biomass increasing from the center to the periphery of the upwelling; maximum densities occurred at 0-20 m depth. The continental slope was dominated by diatoms whereas peridineans and flagellates prevailed over the shelf. Group of Productivity, Department of Hydrobiology, Institute of Marine Biology, Far East Science Center, Academy of Sciences of the U.S.S.R., Vladivostok, U.S.S.R. (izs) 80:6080 Laws, E. A. and T. T. Bannister, 1980. Nutrientand light-limited growth of Thalassiosira fluviatilis in continuous culture, with implications for phytoplankton growth in the ocean. Limnol. Oceanogr., 25(3): 457-473.
Bannister's model describing nutrient-saturated growth fit the light-limited data well, and could also be extended to fit nutrient-limited growth. Dark C loss rates were I0 to 20/~ of daytime production (at ~0.25/day). Chl a:C ratiosand dilution rate were linearly related under nutrient limitation, while productivity indices were a hyperbolic function of dilution rate. 'N :C ratioswere linearly correlated with dilutionrate under both light and nutrient limitation, but with the regressions having opposite signs.' D e p a r t m e n t of Oceanography, University of Hawaii, Honolulu, Hawaii 96822, U.S.A. (mjj) 80:6081 Nair, V. R., 1980. Production and associations of zooplankton in estuarine and nearshore waters of Goa [western India]. Indian J. mar. Sci., 9(2): 116-119. Zooplankton production peaks occurred in November and March/April in the two estuaries and nearshore waters; nearshore mean secondary production was 136 m g C / m 2/day, more than twice that of the estuaries. Crustaceans were the primary scavengers; chaetognaths and coelenterates dominated the predators. Communities originated with filter feeders and omnivores, followed by increasing numbers of predators. Includes a species list. National Institute of Oceanography, Dona Paula, Goa 403 004, India. (slr) 80:6082 Paasche, E. and I. Ostergren, 1980: The annual cycle of plankton diatom growth and silica
893
production in the inner Oslofjord. Limnol. Oceanogr., 25(3): 481-494. Biogenic silica concentrations varied from 2-324 ug Si • L - ~during the year with highest amounts present during diatom blooms, particularly in June. Depletion times of dissolved Si at bloom peak were as short as 3 h and amounts were as much as 20 times less than the biogenic Si present; however, there were no signs of extreme silica shortage (Skeletonema costatum cells were slightly less silicified during the May and June peak, to no apparent harm). Includes 4 Skeletonema costatum micrographs. Department of Marine Biology and Limnology, University of Oslo, P.O. Box 1069, Blindern, Oslo 3, Norway. (sir) 80:6083 Parsons, T. R., L. J. Albright, J. Parslow, M. J. R. Clark, R. W. Drinnan (comments), J. G. Stockner, K. S. Shortreed and E. A. MacIsaac (reply), 1980. [Discussion of] 'Phytoplankton ecology of the Strait of Georgia, British Columbia.' Can. J. Fish. aquat. Sci., 37(6): 1043-1055. Revelante, Noelia and Malvern Microplankton diversity d i ~ t o r s of' eutrophication Adriatic Sea. Hydrobiologia,
80:6084 Gilmartin, 1980. indie~ as inin the northern 70(3): 277-286.
A derived Shannon diversity frequency spectrum provided a single biological quantification which allowed an interpretation of temporal and regional differences (and which can also be used to evaluate future changes in species diversity). The data base comprised a 4+ year time series involving 300 taxa. Department of Oceanography, University of Maine, Orono, Maine 04469, U.S.A. 80:6085 Roy, Suzanne and Louis Legendre, 1980. Field studies of DCMU-enhance¢l fluorescence as an index of in-situ phytoplankton photosynthetic activity. Can. J. Fish. aquat. Sci., 37(6): 1028-1031. N o overall correlation could be established between the specific photosynthetic rate (P/B :photosynthetic activity per unit chlorophyll a) and the increase in fluorescence caused by D C M U (Fv/FN), although there were significant correlations on short transects. Fv/FN profilesin the Gulf of St. Lawrence and the Gulf of Guinea showed a characteristic increase with depth. Technical problems involving the use of Fv/F~ as an estimator of P / B are discussed. Department of Oceanography, Dalhousie University, Halifax, N.S. B 3 H 4J1, Canada. (mjj)