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Planktonic Properties of Honokohau Harbor: A Nutrient-Enriched Subtropical Embayment

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Title:Planktonic Properties of Honokohau Harbor: A Nutrient-Enriched Subtropical Embayment
Authors:Bienfang, P.
Johnson, W.
Date Issued:Jul 1980
Publisher:University of Hawaii Press
Citation:Bienfang P, Johnson W. 1980. Planktonic properties of Honokohau Harbor: a nutrient-enriched subtropical embayment. Pac Sci 34(3): 293-300.
Abstract:The phytoplankton properties of this nutrient-enriched, vertically
stratified harbor show remarkably oligotrophic characteristics considering
the eutrophying potential of groundwater nutrient input. Generally, low
phytoplankton biomass levels (0.06-0.70 mg chlorophyll a/m3 ) and productivity
rates (0.30-5.1 mg C/m3/hr) prevail within the harbor. Zooplankton
standing stocks within Honokohau Harbor were highest in the most inland
reaches of the basin and showed marked increases (numerically about 28 times
and 6 times by dry weight) over levels in adjacent coastal areas. Enteric
bacterial (total and fecal coliforms and fecal streptococci) levels were low,
despite evidence of sewage leakage into the harbor, reflecting both low input
and rapid flushing rates of the basin.
The vertical profiles of phytoplankton parameters reflect the peculiar thermohaline
stratification of the water column. Despite high surface nutrient
levels, a strongly stratified nutricline apparently limits availability to the
subsurface (oceanic) phytoplankton populations. This study discusses the
importance of advective removal (via flushing) and grazing in controlling
phytoplankton stocks within the basin.
Appears in Collections: Pacific Science Volume 34, Number 3, 1980

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