Automated analysis system for coupled .delta.13C and .delta.15N measurements

Fry, Brian; Brand, Willi A.; Mersch, F.; Tholke, K.; Garritt, Robert H.

doi:10.1021/ac00027a009

Cited by 227 publications

(146 citation statements)

References 17 publications

(8 reference statements)

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“…TOC and TN were analyzed using an elemental analyzer (EA) attached to an isotope ratio mass spectrometer (Fry et al 1992). At Geoscience Australia, a Thermo Finnigan Flash EA is coupled to a Finnigan Mat 252.…”

Section: Methodsmentioning

confidence: 99%

Diatoms control nutrient cycles in a temperate, wave‐dominated estuary (southeast Australia)

Haese

Murray

Smith

et al. 2007

Limnology & Oceanography

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Diatoms are important primary producers within pelagic, benthic, and epiphytic communities, and their siliceous frustules sink rapidly to the sediment. We measured benthic nutrient and gas fluxes and water column and sediment properties in an estuary of southeastern Australia to identify control mechanisms coupling benthic and pelagic processes, in particular, how nutrients become fractionated by processes affecting benthic nutrient fluxes. During late spring, the water column of St. Georges Basin was oligotrophic, primary production was likely phosphorus (P) limited, and the phytoplankton community was dominated by cyanophytes. Molar ratios of dissolved inorganic carbon (TCO 2 ) to silica (Si) benthic fluxes, however, were equal to the molar composition of diatoms, indicating that diatoms preferentially sink and deliver the most labile organic matter fraction to the sediment. The congruent release of Si and carbon (C) implies a coupling of processes mobilizing Si and C. Extracellular polymeric substances surrounding the siliceous frustule are the primary labile organic matter fraction, and their rate of mineralization limits the dissolution of the siliceous frustule. Because decomposing biomass in sediments leads to net di-nitrogen (N 2 ) production and very efficient burial of P, the fate of diatoms significantly contributes to the removal of bioavailable nutrients. High dissolved inorganic nitrogen to dissolved inorganic P benthic flux ratios of 290 to 900 promote P limitation, particularly in shallow waterbodies with long water residence times.

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Section: Methodsmentioning

confidence: 99%

Diatoms control nutrient cycles in a temperate, wave‐dominated estuary (southeast Australia)

Haese

Murray

Smith

et al. 2007

Limnology & Oceanography

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“…Approximately 5 to 6 mg of tissue was used for δ 34 S measurements (1 to 2 mg was used for tube worm plumes owing to the high sulfur content) and 0.6 to 1.0 mg was used for δ 13 C and δ 15 N measurements. A Carlo Erba elemental analyzer coupled to a Micromass Optima isotope ratio mass spectrometer (Micromass) was used to obtain δ 13 C, δ 15 N and δ 34 S values (Fry et al 1992, Giesemann et al 1994). The δ 13 C and δ 15 N values were determined concurrently and δ 34 S was determined during separate analysis runs.…”

Section: Methodsmentioning

confidence: 99%

Nutritional associations among fauna at hydrocarbon seep communities in the Gulf of Mexico

MacAvoy¹,

Fisher²,

Carney³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…The stable carbon isotope (d 13 C) content of TOC was analysed by mass spectrometry (Finnigan Delta S) after removal of carbonate with 10% HCl in Ag-cups and combustion to CO 2 in a Heraeus elemental analyser (Fry et al, 1992). Accuracy of the methods was determined by parallel analysis of international standard reference material.…”

Section: Stable Isotopesmentioning

confidence: 99%

Palaeoenvironmental dynamics inferred from late Quaternary permafrost deposits on Kurungnakh Island, Lena Delta, Northeast Siberia, Russia

Wetterich

Kuzmina

Andreev

et al. 2008

Quaternary Science Reviews

135

157

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a b s t r a c tLate Quaternary palaeoenvironments of the Siberian Arctic were reconstructed by combining data from several fossil bioindicators (pollen, plant macro-fossils, ostracods, insects, and mammal bones) with sedimentological and cryolithological data from permafrost deposits. The record mirrors the environmental history of Beringia and covers glacial/interglacial and stadial/interstadial climate variations with a focus on the Middle Weichselian interstadial (50-32 kyr BP). The late Pleistocene to Holocene sequence on Kurungnakh Island reflects the development of periglacial landscapes under changing sedimentation regimes which were meandering fluvial during the Early Weichselian, colluvial or proluvial on gently inclined plaines during the Middle and Late Weichselian, and thermokarstaffected during the Holocene. Palaeoecological records indicate the existence of tundra-steppe vegetation under cold continental climate conditions during the Middle Weichselian interstadial. Due to sedimentation gaps in the sequence between 32 and 17 kyr BP and 17 and 8 kyr BP, the Late Weichselian stadial is incompletely represented in the studied outcrops. Nevertheless, by several palaeoecological indications arctic tundra-steppe vegetation under extremely cold-arid conditions prevailed during the late Pleistocene. The tundra-steppe disappeared completely due to lasting paludification during the Holocene. Initially subarctic shrub tundra formed, which later retreated in course of the late Holocene cooling.

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Automated analysis system for coupled .delta.13C and .delta.15N measurements

Cited by 227 publications

References 17 publications

Diatoms control nutrient cycles in a temperate, wave‐dominated estuary (southeast Australia)

Diatoms control nutrient cycles in a temperate, wave‐dominated estuary (southeast Australia)

Nutritional associations among fauna at hydrocarbon seep communities in the Gulf of Mexico

Palaeoenvironmental dynamics inferred from late Quaternary permafrost deposits on Kurungnakh Island, Lena Delta, Northeast Siberia, Russia

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