. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY: PHYTOPLANKTON DYNAMICS Reference: Biol. Bull 187: 287-288. (October, 1994) 287 Comparison of Phytoplankton and Ecosystem Gross Production in the Quashnet River, an Estuary of Waquoit Bay, Massachusetts Timothy R. Harrison, Jessica L. Box/nil, Lory Z. Santiago I 'azquez, Kenneth Foreman, and James N. Kremer (Boston University Marine Program, Marine Biological Laboratory) The Quashnet River is a shallow (av. depth m) estuary of Waquoit Bay, Massachusetts, that supports a large biomass of benthic macroalgae, in add
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY: PHYTOPLANKTON DYNAMICS Reference: Biol. Bull 187: 287-288. (October, 1994) 287 Comparison of Phytoplankton and Ecosystem Gross Production in the Quashnet River, an Estuary of Waquoit Bay, Massachusetts Timothy R. Harrison, Jessica L. Box/nil, Lory Z. Santiago I 'azquez, Kenneth Foreman, and James N. Kremer (Boston University Marine Program, Marine Biological Laboratory) The Quashnet River is a shallow (av. depth m) estuary of Waquoit Bay, Massachusetts, that supports a large biomass of benthic macroalgae, in addition to phytoplankton producers. To evaluate the factors controlling the relative contribution of phytoplankton production to total ecosystem production in the Quashnet River, we measured both gross phytoplankton pro- duction (GPP) and gross ecosystem production (GEP), along with a suite of physical factors, tor 12 consecutive days. We related change in the ratio of GPP to GEP to photosynthetically available radiation (PAR), temperature, salinity, water column depth, and wind speed and direction. Phytoplankton production was measured daily as the change of oxygen in light and dark bottles during 4- to 6-h incubations: the oxygen concentrations were measured by the Winkler Method (1). Ecosystem production was estimated from diel free water oxygen levels recorded by automated oxygen meters. EN- DECO model 1184C and 6000 pulsed-sensor oxygen meters were used to measure the oxygen, temperature, depth, and salinity of the surface and bottom water, respectively. Wind speed and di- rection were measured with an Onset Tattletale 2-B computer linked to a Digitar #7902 anemometer. The GEP and GPP fluctuated over time, going up or down in synchrony for most days (Fig. 1A). The average GPP was g O2 m~2 d~' (SD = , SE = ), and the average GEP was gO2m-2d-'(SD= , SE = ). The proportion of GEP attributable to GPP has an average of 35% (SD = , SE = 4%) (Fig. IB
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
