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Direct measurement of thed13 C signature of carbon respired by bacteria in lakes: Linkages to potential carbon sources, ecosystem baseline metabolism, andCO2fluxes
the d13 C signature bacteria in lakes potential carbon sources ecosystem baseline metabolism CO2 fluxes
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2014/4/18
Using a novel method to measure the isotopic signature (d13C) of respiratory CO2 produced by bacterioplankton, we determined the proportion of terrigenous vs. algal-derived organic carbon (OC) respire...
Carbon stable isotopes reveal relative contribution of shelf-slope production to the northern California Current pelagic community
Carbon stable isotopes shelf-slope production the northern California Current pelagic community
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2014/4/18
To better delineate the relative contribution of shelf and slope production to the northern California Current (NCC) pelagic community, we examined the cross-shelf distribution ofd13 C in 19 species o...
Inorganic carbon uptake by Southern Ocean phytoplankton
Inorganic carbon uptake Southern Ocean phytoplankton
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2014/4/18
We report the results of laboratory and field studies examining inorganiccarbon (Ci) utilization by Southern Ocean phytoplankton. Both in monospecific laboratory cultures of diatoms and Phaeocystis an...
Tracing13 C-enriched dissolved and particulate organic carbon in the bacteriacontaining coral reef spongeHalisarca caerulea: Evidence for DOM feeding
Tracing13 C-enriched dissolved particulate organic carbon bacteriacontaining coral reef spongeHalisarca caerulea =DOM feeding
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2014/4/18
Here we report on the trophodynamics of the bacteria-containing coral reef sponge Halisarca caerulea. The assimilation and respiration of the13 C-enriched substrates glucose, algal-derived dissolved a...
A comparative study of carbon dioxide degassing in river- and marine-dominated estuaries
carbon dioxide degassing river- and marine-dominated estuaries
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2014/4/18
The partial pressure of carbon dioxide (pCO2), concentration of total dissolved inorganic carbon, and total alkalinity were measured at both high tide and low tide in the surface water of three Georgi...
Stoichiometric regulation of carbon and phosphorus in P-deficient Daphnia magna
Stoichiometric regulation of carbon phosphorus P-deficient Daphnia magna
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2014/4/18
Daphnia magna were fed phosphorus-sufficient (+P) and P-deficient (2P) green algae Chlamydomonas reinhardtii (carbon : phosphorus ratio of C: P = 90 and 930 in molar, respectively) for 5 d to produce ...
Sinking particle properties from polyacrylamide gels during the KErguelen Ocean and Plateau compared Study (KEOPS): Zooplankton control of carbon export in an area of persistent natural iron inputs in the Southern Ocean
Sinking particle properties polyacrylamide gels KErguelen Ocean Plateau compared Study KEOPS Zooplankton control of carbon persistent natural iron inputs Southern Ocean
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2014/4/18
The Kerguelen ocean and plateau compared study (KEOPS) examined the origin of elevated phytoplankton biomass in naturally iron-fertilized waters over the Kerguelen plateau during midsummer (January-Fe...
Relative independence of organic carbon transport and processing in a large temperate river: The Hudson River as both pipe and reactor
Relative independence of organic carbon transport and processing in a large temperate river: The Hudson River as both pipe and reactor
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2014/4/18
Bacterial respiration (BR) of organic matter is an important flux in the carbon budgets of large rivers, yet the regulation of BR and the relationship of this respiration to various organic matter sou...
Mangrove tannins in aquatic ecosystems: Their fate and possible influence on dissolved organic carbon and nitrogen cycling
Mangrove tannins in aquatic ecosystems Their fate and possible influence on dissolved organic carbon nitrogen cycling
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2014/4/18
We describe the fate of mangrove leaf tannins in aquatic ecosystems and their possible influence on dissolved organic nitrogen (DON) cycling. Tannins were extracted and purified from senescent yellow ...
The influence of dissolved organic carbon on bacterial phosphorus uptake and bacteria-phytoplankton dynamics in two Minnesota lakes
The influence of dissolved organic carbon bacterial phosphorus uptake bacteria-phytoplankton dynamics two Minnesota lakes
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2014/4/18
The balance of production in any ecosystem is dependent on the flow of limiting nutrients into either the autotrophic or heterotrophic components of the food web. To understand one of the important co...
Major bacterial contribution to the ocean reservoir of detrital organic carbon and nitrogen
Major bacterial contribution ocean reservoir detrital organic carbon and nitrogen
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2014/4/18
Bacterial biomarkers (D-amino acids and muramic acid) were measured in various organic matter size fractions collected in the North Pacific and North Atlantic, and they were used to quantitatively est...
Microzooplankton dominate carbon flow and nutrient cycling in a warm subtropical freshwater lake
Microzooplankton carbon flow nutrient cycling warm subtropical freshwater lake
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2014/4/22
In a series of grazer-gradient and dilution microcosm experiments, we compared grazing and nutrient mineralization by naturally co-existing crustacean and microzooplankton assemblages from mesoeutroph...
Patterns and regulation of dissolved organic carbon: An analysis of 7,500 widely distributed lakes
Patterns regulation dissolved organic carbon 7,500 widely distributed lakes
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2014/4/22
Dissolved organic carbon (DOC) is a key parameter in lakes that can affect numerous features, including microbial metabolism, light climate, acidity, and primary production. In an attempt to understan...
Oxygen as a control on sea floor biological communities and their roles in sedimentary carbon cycling
Oxygen sea floor biological communities sedimentary carbon cycling
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2014/4/22
13C tracer experiments were conducted at sites spanning the steep oxygen, organic matter, and biological community gradients across the Arabian Sea oxygen minimum zone, in order to quantify the role t...
Determining net dissolved organic carbon production in the hydrographically complex western Arctic Ocean
Determining net dissolved organic hydrographically complex western Arctic Ocean
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2014/4/22
Each spring and summer, the Chukchi Sea in the western Arctic Ocean experiences a short but intense
phytoplankton bloom that is controlled by sea ice cover, nutrient availability, and river runoff. D...