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TIAN, R.C., A.F. VÉZINA, L. LEGENDRE, R.G. INGRAM, B. KLEIN, T. PACKARD, S. ROY, C. SAVENKOFF, N. SILVERBERG, J.-C. THERRIAULT, J.É. TREMBLAY, 2000. Effects of pelagic food-web interactions and nutrient remineralization on the biogeochemical cycling of carbon : a modeling approach. Deep-Sea Res., Part II, Top. Stud. Oceanogr. 47(3-4): 637-662 .
PACKARD, T., W. CHEN, D. BLASCO, C. SAVENKOFF, A.F. VEZINA, R. TIAN, L. ST-AMAND, S.O. ROY, C. LOVEJOY, B. KLEIN, J.-C. THERRIAULT, L. LEGENDRE, R.G. INGRAM, 2000. Dissolved organic carbon in the Gulf of St. Lawrence. Deep-Sea Res., Part II , Top. Stud. Oceanogr., 47(3-4): 435-459 .
ST-AMAND, L., R. GAGNON, T.T. PACKARD, C. SAVENKOFF, 1999. Effects of inorganic mercury on the respiration and the swimming activity of shrimp larvae, Pandalus borealis. Comp. Biochem. Physiol., C: Pharmacol. Toxicol. Endocrinol., 122(1): 33-43 .
ROY, S.O., PACKARD, T.T., BERDALET, E., ST-AMAND, L., 1999. Impact of acetate, pyruvate, and physiological state on respiration and respiratory quotients in Pseudomonas nautica. Aquat. Microbiol. Ecol., 17: 105-110 .
ROY, S.O., T.T. PACKARD, 1998. NADP-isocitrate dehydrogenase from Pseudomonas nautica : kinetic constant determination and carbon limitation effects on the pool of intracellular substrates. Appl. Environ. Microbiol., 64: 4958-4964 .
SAVENKOFF, C., A.F. VÉZINA, T.T. PACKARD, N. SILVERBERG, J.-C. THERRIAULT, W. CHEN, C. BÉRUBÉ, A. MUCCI, B. KLEIN, F. MESPLÉ, J.-E. TREMBLAY, L. LEGENDRE, J. WESSON, R.G. INGRAM, 1996. Distributions of oxygen, carbon, and respiratory activity in the deep layer of the Gulf of St. Lawrence and their implications for the carbon cycle. Can. J. Fish. Aquat. Sci., 53: 2451-2465 .
The Gulf of St. Lawrence (GSL) is a semi-enclosed sea with an estuarine circulation forced by runoff from the St. Lawrence and Great Lakes drainage systems and balanced by a deep inflow of oceanic waters through the Laurentian Channel. Based on samples collected between July 1992 and June 1994 during Phase 1 of the CJGOFS program conducted in the Gulf of St. Lawrence, new data are presented on the carbon and nutrient chemistry as well as respiratory activity in the deep waters. Organic carbon fluxes estimated from sediment trap data, deepwater respiratory activity, and benthic respiration measurements are consistent with those obtained from the changes in the dissolved oxygen concentration of the deep waters along the Laurentian Channel. These flux estimates suggest that approximately 10 % of the local primary production reaches the deep layer (> 200 m) and the sediments in the GSL. The vertical carbon budget is almost balanced in the eastern part of the gulf, but approximately half of the carbon produced in the surface layer of the northwestern gulf cannot be accounted for. The difference in hydrodynamic and biological conditions prevailing in both areas may explain the observations.
PACKARD, T.T., E. BERDALET, D. BLASCO, S.O. ROY, L. ST-AMAND, B. LAGACÉ, K. LEE, J.-P. GAGNÉ, 1996. Oxygen consumption in the marine bacterium Pseudomonas nautica predicted from ETS activity and bisubstrate enzyme kinetics. J. Plankton Res., 18: 1819-1835 .
PACKARD, T., E. BERDALET, D. BLASCO, S.O. ROY, L. ST-AMAND, B. LAGACÉ, K. LEE, J.-P. GAGNÉ, 1996. CO2 production predicted from isocitrate dehydrogenase activity and bisubstrate enzyme kinetics in the marine bacterium Pseudomonas nautica. Aquat. Microbiol. Ecol., 11: 11-19 .
Respiration (physiological and enzymatic potential), growth (dry-weight [DW], body and carapace lengths), and protein content were measured on the larval stages of the northern shrimp Pandalus borealis. The relationship between oxygen consumption and growth through the larval development was examined under controlled laboratory conditions of temperature and food mixture. Body and carapace lengths, as well as respiration (R) increased as a linear function of time (days) during larval development, whereas biomass, measured as dry-weight and protein content, and enzymatic potential respiration (ETSA) are best described as exponential functions of time during the experiment. There was a decreasing trend in the weight-specific respiration rate (dry-weight-based, QO2) during development from hatching to the last larval instar. We estimate that the zoeae of P. borealis require a minimum of 2.95 to 0.44 J mg DW-1 d-1 from the zoeae I stage to the megalopa stage. We propose that the R/ETSA ratio could be used as a quantitative index of the sensitivity of shrimp larvae to environmental stress. The first larval instar would be the most vulnerable, since respiration is close to the respiratory capacity. With growth, and the decrease of the R/ETSA ratio, the later larval instars had a higher potential to generate energy and to respond to environmental stress.
SAVENKOFF, C., T.T. PACKARD, M. RODIER, M. GÉRINO, D. LEVÈVRE, M. DENIS, 1995. Relative contribution of dehydrogenases to overall respiratory ETS activity in some marine organisms. J. Plankton Res., 17:1593-1604 .
CODISPOTI, L.A., J.W. ELKINS, T. YOSHINARI, G.E. FRIEDERICH, C.M. SAKAMOTO, T.T. PACKARD, 1992. On the nitrous oxide flux from productive regions that contain low oxygen waters. Pages 271-284 in B.N. Desai (ed.). Oceanography of the Indian Ocean. Oxford and IBH .
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