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Sedimentation in Kaneohe Bay, Oahu, Hawaii 1977 and 1978

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Title:Sedimentation in Kaneohe Bay, Oahu, Hawaii 1977 and 1978
Authors:Taguchi, Satoru
LC Subject Headings:Sedimentation and deposition -- Hawaii -- Kaneohe Bay.
Date Issued:Mar 1980
Publisher:Hawai'i Institute of Marine Biology (formerly Hawai'i Marine Laboratory)
Citation:Taguchi S. 1980. Sedimentation in Kaneohe Bay, Oahu, Hawaii 1977 and 1978. Honolulu (HI): Hawai’i Institute of Marine Biology, University of Hawai’i. Report No.: 36.
Series:HIMB Technical Reports
No. 36
Abstract:Sinking material was collected with sediment traps for a 13 month period
in a eutrophic subtropical embayment, Kaneohe Bay, Hawaii. A ratio method was
applied to distinguish sedimentation from resuspension. An annual average of
74+15% of the total material trapped had been resuspended. The resuspension
rate appeared to be controlled by wind speed (pbenthic diatoms to the diatom assemblage in the water column was also related
to wind speed (p0.453±0.23 for organic carbon and 0.373+0.32 for
chlorophyll a. The discarded houses of the appendicularian Oikopleura longicauda
Vogt (9xl0 4 houses·m-2·day-1) and fecal pellets produced by net zooplankton
(2.77 cm3·m-2·day-1) contributed about 61% and 13% of the sedimentation rate of
organic carbon, respectively. Detritus and phytoplankton contributed about 17%
and 9% of organic carbon, respectively. The detritus contribution was calculated
by difference. The sinking velocity of the discarded houses appeared to be
controlled by the chemical composition of the trapped material (pcontribution of suspended matter in freshwater runoff was concluded to be about
6.4% of the annual average sedimentation rate, assuming a tenfold increase in
concentration of particulate organic matter in the freshwater runoff over the
surface water. The annual average sedimentation rate of particulate organic
carbon produced in the water column was estimated to be 0.425±0.22 gC·m-2·day-1,
which was about 42% of the primary production by phytoplankton in the water
column. The annual sedimentation rate including terrestrial material was
165 gC·m-2·year-1 (2 kgDW·m-2·year-1). Comparing this estimate with an independent
geological estimate (132 gC·m-2·year-1) suggests significant accumulation of organic matter in the bottom sediments from non-sedimentation processes. Annual
sedimentation rate excluding terrestrial material was 155 gC·m-2·year-l. About
51% of organic carbon supply was respired in the water column.
Pages/Duration:170 pages
Appears in Collections: HIMB Technical Reports

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