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Biomass and Compositional Characteristics of Kaneohe Bay, Oahu, Hawaii, Phytoplankton Inferred from Regression Analysis

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Title:Biomass and Compositional Characteristics of Kaneohe Bay, Oahu, Hawaii, Phytoplankton Inferred from Regression Analysis
Authors:Taguchi, Satoru
Laws, Edward A.
Date Issued:Oct 1989
Publisher:University of Hawaii Press
Citation:Taguchi S, Laws EA. 1989. Biomass and compositional characteristics of Kaneohe Bay, Oahu, Hawaii, phytoplankton inferred from regression analysis. Pac Sci 43(4): 316-331.
Abstract:Concentrations of chlorophyll a (chl a), particulate carbon (PC),
and particulate nitrogen (PN) measured on a weekly basis in the picoplankton
and nano-plus-microplankton size fractions over a 2-yr period from 1986 to
1988 at a station near a former sewage outfall in Kaneohe Bay, Oahu, Hawaii,
were compared to similar data collected in 1970, 1972, 1974, and 1976-1977
while sewage was being discharged into the bay, and in 1978-1979 immediately
after diversion of the sewage. Particulate concentrations showed considerable
temporal variability both within and between years. High concentrations were
associated with periods of above-average rainfall. Heavy rains that occurred
during two successive periods of spring tides produced chl a concentrations of
over 40 mg m-3 in January 1988, almost four times the highest concentration
measured during the period of sewage discharges. Nutrients from land runoff as
well as from decomposition of organisms killed by salinity stress were the
apparent cause of this spectacular bloom. The bloom consisted almost entirely of
nanoplankton and microplankton, but picoplankton accounted for 45 ± 14% of
the chl a during the remainder of the 1986-1988 study. Phytoplankton C:N
ratios were apparently unaffected by diversion of sewage from the bay and
averaged within 10% of the Redfield ratio. This result implies that phytoplankton
were growing at close to nutrient-saturated rates both before and after the
sewage diversion. Nutrient budget calculations indicated that most of the growth
has been supported by recycling within the bay. Phytoplankton C: chl and N: chl
ratios estimated by regression analyses increased after the sewage diversion,
apparently in response to the increase in average irradiance in the water column
caused by the decline in seston concentrations. C: N ratios of picoplankton and
nano-plus-microplankton under nutrient-saturated conditions were about 4.6 ±
0.3 and 6.2 ±O.8, respectively; the difference probably reflected the high concentration
of nitrogen-containing pigments in some picoplankton.
Appears in Collections: Pacific Science Volume 43, Number 4, 1989

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