Journal ArticleDOI
Benthic microalgal biomass in sediments of Onslow Bay, North Carolina
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Sediment samples were collected at stations along cross-shelf transects in Onslow Bay, North Carolina, during two cruises in 1984 and 1985 as discussed by the authors.Abstract:
Sediment samples were collected at stations along cross-shelf transects in Onslow Bay, North Carolina, during two cruises in 1984 and 1985. Station depths ranged from 11 to 285 m. Sediment chlorophyll a concentrations ranged from 0·06 to 1·87 μg g −1 sediment (mean, 0·55), or 2·6–62·0 mg m 2 . Areal sediment chlorophyll a exceeded water column chlorophyll a a at 16 of 17 stations, especially at inshore and mid-shelf stations. Sediment ATP concentrations ranged from 0 to 0·67 μg g −1 sediment (mean, 0·28). Values for both biomass indicators were lowest in the depth range including the shelf break (50–99 m). Organic carbon contents of the sediments were uniformly low across the shelf, averaging 0·159% by weight. Photography of the sediments revealed extensive patches of microalgae on the sediment surface. Our data suggest that viable benthic microalgae occur across the North Carolina continental shelf. The distribution of benthic macroflora on the North Carolina shelf indicates that sufficient light and nutrients are available to support primary production out to the shelf break. Frequent storm-induced perturbations do not favour settling of phytoplankton, an alternative explanation for the presence of microalgal pigments in the sediments. Therefore, we propose that a distinct, productive benthic microflora exists across the North Carolina continental shelf.read more
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Microphytobenthos: The ecological role of the “secret garden” of unvegetated, shallow-water marine habitats. I. Distribution, abundance and primary production
TL;DR: On both the basis of biomass and biogeochemical reactivity, benthic microalgae play significant roles in system productivity and trophic dynamics, as well as such habitat characteristics as sediment stability.
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Fish habitat: essential fish habitat and rehabilitation
TL;DR: The essential fish habitat provisions of the Magnuson-Stevens Act provide an outstanding opportunity for the National Marine Fisheries Service, the Councils, and numerous partners from every sector of society to develop new ecosystem approaches to fishery management addressing cumulative impacts to habitats in a comprehensive, effective, and efficient manner.
Journal ArticleDOI
Benthic flux of biogenic elements on the Southeastern US continental shelf: influence of pore water advective transport and benthic microalgae
TL;DR: In situ, paired light and dark benthic flux chamber incubations were used to estimate the exchange of nutrients, oxygen and inorganic carbon across the sediment-water interface of the South Atlantic Bight (SAB) continental shelf.
Journal ArticleDOI
Benthic microalgal production in Onslow Bay, North Carolina, USA
LB Cahoon,JE Cooke +1 more
TL;DR: Benthic microalgal production and sediment respiration were measured in Onslow Bay, a portion of the North Carolina continental shelf, between 1984 and 1989, by measuring changes in dissolved oxygen concentrations inside clear and opaque benthic chambers placed by divers.
Journal ArticleDOI
Stable isotope analyses differentiate between different trophic pathways supporting rocky-reef fishes
CJ Thomas,LB Cahoon +1 more
TL;DR: Multiple stable isotope signatures of these 5 species indicated that at least 2 trophic pathways, one planktonic and one benthic, supported these reef-associated species.
References
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Book
A manual of chemical and biological methods for seawater analysis
TL;DR: In this article, the authors describe counting, media, and preservatives for analytical techniques, including soluble organic material, plant pigments, and photosynthesis in seawater, and show how to count media and preservative.
Book
Biological oceanographic processes
TL;DR: In this paper, the authors proposed a method for the detection of biological oceanographic processes using biological oceanography processes, which they called Biological Oceanographic processes (BOP). But this method is not suitable for outdoor applications.
Journal ArticleDOI
An inexpensive titration method for the determination of organic carbon in recent sediments
TL;DR: In this article, a comparison of the two sets of data yields a regression line with a slope of 0.992, intercept of 0., and a correlation coefficient of 0,989.
Journal ArticleDOI
The measurement of adenosine triphosphate in the ocean and its ecological significance1
TL;DR: The ATP levels found at various depths in the ocean indicate bacterial populations between 50−2,000 times those found by plating techniques, and the biomass of living material in the water has been estimated using the ATP content of laboratory cultured microorganisms as indicators of endogenous ATP levels.
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Quantitative degradation of chlorophyll by a marine herbivore1
TL;DR: In this article, the decrease in chlorophyll concentration and the increase in pheophorbide concentration was determined in laboratory grazing experiments, primarily with Calanus sp. feeding on Coscinodiscus angstii.