Information identified as archived is provided for reference, research or recordkeeping purposes. It is not subject to the Government of Canada Web Standards and has not been altered or updated since it was archived. Please contact us to request a format other than those available.
Water column constituents and sedimentation rates of C, N, and pigments were measured at a fixed station near Gascons (26 m) in baie des Chaleurs, Québec, at 1-4 day intervals between 16 June and 20 August 1992. Water column constituents were chlorophyll a and phaeopigments (<5 pm, 5-153 pm, 0.7-153 pm) and particulate organic carbon and nitrogen. Constituents in the water column and in the sedimentation varied little throughout the sampling period (CV 40 %) except for water column chlorophyll a >5 pm and phaeopigments >5 pm (CV >117 %) and sedimented chlorophyll a (CV=92 %). The standing stock of chlorophyll a in the size class >5 pm was positively related to the standing stock of total chlorophyll a. This log-log mode1 had a slope of 2.25 and explained 86.5 % of the variation. Empirical models describing the sedimentation rate of pigments (R2=41.0-46.4 %) had higher predictive power than those predicting the sedimentation rates of either C (R2=1 1.5 %-14.6 %) or N (R2=20.2 %-24.2 %). The best predictor of the sedimentation rate of pigments was the standing stock of pigment in the size class >5 pm (R2=46.4 %). The slope of the log-log relationship (0.41) implied that the sedimentation rate did not increase linearly with the standing stock of pigment >5 pm. Inferences from these models and their implications on the monitoring of baie des Chaleurs are discussed.
- Date modified: