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15N uptake may reflect transient rather than steady-state characteristics. On the Scotian Shelf (eastern Canada), NP computed from the f ratio becomes equivalent to BC export when integrated on time scales greater than 6 months (S. Dauchez, L. Legendre, L. Fortier, M. Levasseur, Mar. Ecol. Prog. Ser., in press.)
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15N uptake may reflect transient rather than steady-state characteristics. On the Scotian Shelf (eastern Canada), NP computed from the f ratio becomes equivalent to BC export when integrated on time scales greater than 6 months (S. Dauchez, L. Legendre, L. Fortier, M. Levasseur, Mar. Ecol. Prog. Ser., in press.)
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2 = 0.75, P < 0.001) from J. Aristegui and M. F. Montero [J. Plank. Res. 17, 1563 (1995)] and a respiratory quotient equal to 1. Ciliate and flagellate abundance were determined by epifluorescence microscopy from glutaraldehyde-preserved samples. Bacterial grazing mortality in the <200 μm size fraction was determined from dilution assays [M. R. Landry and R. P. Hasset, Mar. Biol. 67, 283 (1982)]. Mesozooplankton collected during vertical net (0.5 m diameter WP-2 net with 200-μm aperture) hauls (0 to 150 m at stations 1 and 2 and 0 to 60 m at stations 4 and 5) were screened and then dried at 60°C, and the dry weight was converted to carbon biomass with the use of size-dependent empirical relations.
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2 = 0.75, P < 0.001) from J. Aristegui and M. F. Montero [J. Plank. Res. 17, 1563 (1995)] and a respiratory quotient equal to 1. Ciliate and flagellate abundance were determined by epifluorescence microscopy from glutaraldehyde-preserved samples. Bacterial grazing mortality in the <200 μm size fraction was determined from dilution assays [M. R. Landry and R. P. Hasset, Mar. Biol. 67, 283 (1982)]. Mesozooplankton collected during vertical net (0.5 m diameter WP-2 net with 200-μm aperture) hauls (0 to 150 m at stations 1 and 2 and 0 to 60 m at stations 4 and 5) were screened and then dried at 60°C, and the dry weight was converted to carbon biomass with the use of size-dependent empirical relations.
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2 = 0.75, P < 0.001) from J. Aristegui and M. F. Montero [J. Plank. Res. 17, 1563 (1995)] and a respiratory quotient equal to 1. Ciliate and flagellate abundance were determined by epifluorescence microscopy from glutaraldehyde-preserved samples. Bacterial grazing mortality in the <200 μm size fraction was determined from dilution assays [M. R. Landry and R. P. Hasset, Mar. Biol. 67, 283 (1982)]. Mesozooplankton collected during vertical net (0.5 m diameter WP-2 net with 200-μm aperture) hauls (0 to 150 m at stations 1 and 2 and 0 to 60 m at stations 4 and 5) were screened and then dried at 60°C, and the dry weight was converted to carbon biomass with the use of size-dependent empirical relations.
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2 = 0.75, P < 0.001) from J. Aristegui and M. F. Montero [J. Plank. Res. 17, 1563 (1995)] and a respiratory quotient equal to 1. Ciliate and flagellate abundance were determined by epifluorescence microscopy from glutaraldehyde-preserved samples. Bacterial grazing mortality in the <200 μm size fraction was determined from dilution assays [M. R. Landry and R. P. Hasset, Mar. Biol. 67, 283 (1982)]. Mesozooplankton collected during vertical net (0.5 m diameter WP-2 net with 200-μm aperture) hauls (0 to 150 m at stations 1 and 2 and 0 to 60 m at stations 4 and 5) were screened and then dried at 60°C, and the dry weight was converted to carbon biomass with the use of size-dependent empirical relations.
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unpublished data
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algae 20 to 65 μm) × 100]; CR, clearance rate} of the dominant copepods was 1 to 44% (median = 4.8%, n = 9) in both seasons. This implies that large phytoplankton were preferentially ingested whenever they were present [K. Crocker, unpublished data].
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2 tubes (aspect ratio = 10:1) were deployed below the euphotic zone, at about 50 m, for 24 hours. Fresh trap material was microscopically examined, combined and concentrated by settling and centrifugation, and split for subsequent determination of POC, PON (CHN analysis), and chlorophyll a (by high-performance liquid chromatography) [S. W. Wright et al., Mar. Ecol. Prog. Sci. 77, 183 (1991)]. and for microscopic enumeration of fecal pellets.
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The total volume of mesozooplankton fecal pellets collected in the traps was 2.9 to 6.5 (mean = 3.9) times smaller during than after the bloom.
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10 = 3.5 to 5.4) [F. Rassoulzadegan, Ann. Inst. Oceanogr. Paris 58, 177 (1982); C. M. Aelion and S. W. Chisholm, J. Plank. Res. 7, 821 (1985)]. In contrast, growth rates of HNAN from seasonally cold oceans are >0.5 per day at -1.8°C [J. W. Choi and F. Peters, Appl. Environ. Microbiol. 58, 593 (1992)].
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0006480107
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10 = 3.5 to 5.4) [F. Rassoulzadegan, Ann. Inst. Oceanogr. Paris 58, 177 (1982); C. M. Aelion and S. W. Chisholm, J. Plank. Res. 7, 821 (1985)]. In contrast, growth rates of HNAN from seasonally cold oceans are >0.5 per day at -1.8°C [J. W. Choi and F. Peters, Appl. Environ. Microbiol. 58, 593 (1992)].
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10 = 3.5 to 5.4) [F. Rassoulzadegan, Ann. Inst. Oceanogr. Paris 58, 177 (1982); C. M. Aelion and S. W. Chisholm, J. Plank. Res. 7, 821 (1985)]. In contrast, growth rates of HNAN from seasonally cold oceans are >0.5 per day at -1.8°C [J. W. Choi and F. Peters, Appl. Environ. Microbiol. 58, 593 (1992)].
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Sherr and Sherr reported that >88% of bacteriverous HNAN are <5 μm [B. F. Sherr and E. B. Sherr, Mar. Microb. Food Webs 5, 227 (1991)], whereas larger HNAN preferentially ingest pico- and nano-phytoplankton [Microb. Ecol. 28, 223 (1994)].
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15844367939
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Sherr and Sherr reported that >88% of bacteriverous HNAN are <5 μm [B. F. Sherr and E. B. Sherr, Mar. Microb. Food Webs 5, 227 (1991)], whereas larger HNAN preferentially ingest pico- and nano-phytoplankton [Microb. Ecol. 28, 223 (1994)].
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1) (plus an unamended control), and the time course change in bacterial abundance was measured for 72 to 96 hours [R. B. Rivkin, M. R. Anderson, D. E. Gustafson, Antarct. J. U.S. 26, 145 (1991); R. B. Rivkin, unpublished data].
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This is the approach generally used in models employing remotely sensed data [T. Platt and S. Sathyendranath, Science 241, 1613 (1988); R. C. Dugdale, A. Morel, A. Bricaud, F. R. Wilkerson, J. Geophys. Res. 94, 18119 (1989); S. Sathyendranath et al., Nature 353, 129 (1991)].
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This is the approach generally used in models employing remotely sensed data [T. Platt and S. Sathyendranath, Science 241, 1613 (1988); R. C. Dugdale, A. Morel, A. Bricaud, F. R. Wilkerson, J. Geophys. Res. 94, 18119 (1989); S. Sathyendranath et al., Nature 353, 129 (1991)].
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This is the approach generally used in models employing remotely sensed data [T. Platt and S. Sathyendranath, Science 241, 1613 (1988); R. C. Dugdale, A. Morel, A. Bricaud, F. R. Wilkerson, J. Geophys. Res. 94, 18119 (1989); S. Sathyendranath et al., Nature 353, 129 (1991)].
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This research was done as a contribution to the programs of the Ocean Sciences Centre, GIROQ (Groupe interuniversitaire de recherches océanographiques du Québec), and thé Maurice Lamontagne Institute, Department of Fisheries and Oceans (DFO), Canada. The research was part of the Canadian Joint Global Ocean Flux Study program, whose principal support comes from the Natural Sciences and Engineering Research Council of Canada and the DFO. We thank A. Bedi, H. Chen, M.-L. Dubé, L. Dyer, A. Gagné, C. LeDrew, S. Mazumber, S. Noonan, P. Peltolla, M. Riehl and N. Simard for technical assistance and acknowledge the contributions of the captains and crews of the research vessel CSS Hudson (DFO) and the Canadian Coast Guard icebreaker Sir Wilfrid Laurier for assistance with sample collection and sediment trap deployment and retrieval.
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