Organic carbon in surface sands seaward of Altamaha and Doboy Sounds, Georgia

Pinet, Paul R.; Frey, Robert W.

doi:10.1130/0016-7606(1977)88<1731:ocisss>2.0.co;2

Cited by 14 publications

(5 citation statements)

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“…While mean macro-infaunal biomass was 1.6 g C m-' in sandy shelf regions (Hanson et al 1981), macro-epifauna1 biomass in low-to medium-dense regions of Gray's Reef ranged between 27 and 77 g C (Table 2). Organic carbon levels in Gray's Reef sands 10.63 mg C g-' dry wt (C = 37 % of ash-free dry weight)] were substantially higher than in the sands at inner and mid-shelf regions (< 1 to 0.3 mg C g-' dry wt; Pinet & Frey 1977, Hanson et al 1981.…”

Section: Discussionmentioning

confidence: 97%

Community metabolism and nutrient cycling at Gray's Reef, a hard bottom habitat in the Georgia Bight

Hopkinson¹,

Fallon²,

Jansson³

et al. 1991

Mar. Ecol. Prog. Ser.

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ABSTRACT. Benthic and pelagic metabolism and nutrient fluxes were measured during summer on a hard bottom on the continental shelf of the Georgia Bight, USA. Internal pools of organic matter and nutrients in the sediments and water column were also measured and compared with physical transport associated with ocean currents. Gray's Reef is a heterogeneous system cons~sting of a mosaic of bare sand regions, hard bottom regions thinly veneered with shifting sands, and exposed rock outcrops.Sediment organic carbon content increased from < 0.2 % of dry weight in sandy regions to an epifaunal biomass >77 g C m-' on rock outcrops. Sponges and corals accounted for a large percentage of macrofaunal biomass when sands were shallow. Benthic metabolism and nutrient regeneration were positively related to the spatial distribution of epifaunal biomass. In regions of high epifaunal biomass respiration exceeded 133 mg C m-' d-' and nutrient flux amounted to 23 mm01 inorganic N, 1.8 mm01 inorganic P, and 24 and 0.4 mm01 m-'d-' dissolved organic N and P, respectively. The benthic community of Gray's Reef was markedly heterotrophic, consuming almost twice as much organic matter as was produced on the bottom (production :respiration = 0.52.1). Community respiration in the water column exceeded by ca 30 % a fairly high level of pelagic primary production of 2.15 g C m-* d-' The overall Gray's Reef system was heterotrophic and strongly dependent on allochthonous organic carbon for support of almost one third of its total respiratory requirements (production : respiration = 0.68.1). A large percentage (> 50 %) of system biomass and respiration was attributable to filter-feeding organisms which are largely ungrazed, including corals and sponges. A net effect of this hard bottom system was the capture and removal of organic matter produced in the water column. As most of the macrofauna is ungrazed, this organic matter becomes unavailable for support of food chains leading to the production of commercially important fishes. We present some thoughts on the relationship between hard bottoms, in general, and the anon~alously low level of fishery production in the Georgia Bight as a whole

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Section: Discussionmentioning

confidence: 97%

Community metabolism and nutrient cycling at Gray's Reef, a hard bottom habitat in the Georgia Bight

Hopkinson¹,

Fallon²,

Jansson³

et al. 1991

Mar. Ecol. Prog. Ser.

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“…Salinities ranged from 28 to 35 %O S. Sediments were 90 to 98 % sand with some silt and clay . Organic contents ranged from 0.3 to 2.0 % (Pinet and Frey, 1977). Samples were collected from shipboard using a Reineck box corer or by SCUBA diver using 3.7 cm I.D.…”

Section: Methodsmentioning

confidence: 99%

Bacterial production in marine sediments: will cell-specific measures agree with whole-system metabolism?

Fallon¹,

Newell²,

Hopkinson³

1983

Mar. Ecol. Prog. Ser.

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Estimates for bacterial production in nearshore western Atlantic Ocean sediments were made using the frequency of dividing cell and thymidine uptake methods. The frequency of dividing cell (FDC) method resulted in estimates in the range of 5 to 50 g C m-' d-'. The thymidine uptake (THY) method resulted in estimates of 1 to .8 g C mP2 d-'. Metabolic measurements based on sediment oxygen uptake show that the FDC estimates are unreasonably high, while THY estimates, which have been corrected for DNA extraction and thymidine dilution, are reasonable w~t h respect to oxygen uptake data. Problems associated with these 2 bacterial production methods when used in sediments are discussed.

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“…A correlation of organic carbon with the finer sized sediments has been known since Trask (1932) and has been shown by many other workers more recently (Thomas, 1969;Kemp, 1971;Folger, 1972;Gross et al, 1972;Pinet and Frey, 1977;Anderhalt and Reed, 1978).…”

Section: Organic U (Ppm)mentioning

confidence: 71%

Uranium distribution in relation to sedimentary facies, Kern Lake, California

Merifield¹,

Carlisle²,

Idiz³

et al. 1980

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This report is a result of work performed by Bendix Field Engineering Corporation as part of the National Uranium Resource Evaluation. NURE is a program of the U.S. Department of Energy's Grand Junction, Colorado, Office to acquire and compile geologic and other information with which to assess the magnitude and distribution of uranium resources and to determine areas favorable for the occurrence of uranium in the United States.

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Organic carbon in surface sands seaward of Altamaha and Doboy Sounds, Georgia

Cited by 14 publications

References 0 publications

Community metabolism and nutrient cycling at Gray's Reef, a hard bottom habitat in the Georgia Bight

Community metabolism and nutrient cycling at Gray's Reef, a hard bottom habitat in the Georgia Bight

Bacterial production in marine sediments: will cell-specific measures agree with whole-system metabolism?

Uranium distribution in relation to sedimentary facies, Kern Lake, California

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