Abstract
In vivo fluorescence and light beam transmission were simultaneously recorded during two cruises in the St. Lawrence estuary. Marked differences in the relationship between light beam attenuation (c(660)) and in vivo fluorescence (IVF) were observed (1) along a short transect and (2) between surface (<5 m) and underlying waters (5–15 m) for a series of vertical profiles at an anchor station. In both cases, the observed differences were related to changes in fluorescence yield. At the anchor station, however, several other factors could also have affected the c(660)–IVF relationship. Below 5 m, tight linear relationships between c(660) and IVF indicate that no major change took place in either fluorescence yield or the concentration of chlorophyll per cell. In such a case, the two measurements provide consistent estimates of phytoplankton biomass.
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