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Effects of labile carbon addition on a headwater stream food web
Effects of labile carbon addition headwater stream food web
2014/5/9
We added dextrose for two 8-week periods (summer and autumn) to a highly heterotrophic headwater stream in North Carolina, U.S.A., to examine the responses of its benthic food web to increased labile ...
Effects of dissolved carbon dioxide, zinc, and manganese on the cadmium to phosphorus ratio in natural phytoplankton assemblages
Effects of dissolved carbon dioxide, zinc, and manganese the cadmium to phosphorus ratio natural phytoplankton assemblages
2014/5/9
We report the results of a field study, in productive waters off California, of the factors that control the particulate cadmium (Cd) : phosphorus (P) composition of natural assemblages of marine phyt...
Comparison of size-dependent carbon, nitrate, and silicic acid uptake rates in high- and low-iron waters
size-dependent carbon nitrate silicic acid uptake rates high- and low-iron waters
2014/5/9
We compare the relative contribution of large phytoplankton (>5 and >10 μm) to uptake rates of carbon (C), nitrate (NO3-), and dissolved silicon (Si) and uptake ratios of Si :NO and Si :C in Monterey ...
The effect of growth rate, phosphorus concentration, and temperature on N2 fixation, carbon fixation, and nitrogen release in continuous cultures of Trichodesmium IMS101
growth rate phosphorus concentration temperature on N2 fixation carbon fixation nitrogen release continuous cultures Trichodesmium IMS101
2014/5/9
With the use of continuous culture systems, rates of dinitrogen (N2) and carbon (C) fixation and nitrogen (N)- and C-based doubling times were assessed in Trichodesmium IMS101 growing exponentially at...
Linking ecosystem dynamics and biogeochemistry: Sinking fractionation of organic carbon in a Swedish fjord
Linking ecosystem dynamics biogeochemistry Sinking fractionation organic carbon a Swedish fjord
2014/5/9
We studied the growth and sedimentation of a phytoplankton bloom in the Gullmar Fjord in spring 2001. Sinking fractionation, as measured by differential sinking of components having varied carbon isot...
Biomarker and carbon isotopic constraints on bacterial and algal community structure and functioning in a turbid, tidal estuary
Biomarker carbon isotopic constraints bacterial and algal community structure functioning tidal estuary
2014/5/8
We studied planktonic community structure and isotopic composition using compound-specific 13C analysis of phospholipid-derived fatty acids (PLFA) along the Scheldt estuary during a spring bloom. A co...
Species-specific ingestion of organic carbon by deep-sea benthic foraminifera and meiobenthos: In situ tracer experiments
Species-specific ingestion organic carbon deep-sea benthic foraminifera meiobenthos situ tracer experiments
2014/5/8
We measured organic carbon uptake rates by deep-sea benthic foraminifera and studied differences among species, living depth, and seasons to investigate how these protists contribute to carbon consump...
Virus and bacteria dynamics of a coastal sediment: Implication for benthic carbon cycling
Virus and bacteria dynamics coastal sediment Implication for benthic carbon cycling
2014/5/19
We measured microbial heterotrophic activity, bacteria, and virus-like particle (VLP) abundance in homogenized, undiluted, and anoxic enclosures of sediment collected at a coastal station. The bacteri...
Pathways of organic carbon oxidation in a deep lacustrine sediment, Lake Michigan
Pathways of organic carbon oxidation deep lacustrine sediment Lake Michigan
2014/5/19
Rates of microbial iron reduction and other pathways of organic carbon (Corg) oxidation were investigated in sediment from a 100-m deep site in Lake Michigan. Total benthic mineralization rates of 6.8...
Differential uptake of dissolved and particulate organic carbon by the marine mussel Perna viridis
Differential uptake of dissolved particulate organic carbon marine mussel Perna viridis
2014/5/19
We used radiotracers in laboratory experiments to determine the organic carbon uptake by the marine mussel Perna viridis from different diets (phytoplankton and detritus) and from the dissolved phase ...
Relationship between bacterial community structure, light, and carbon cycling in the eastern subarctic North Pacific
bacterial community structure light carbon cycling eastern subarctic North Pacific
2014/5/19
Biogeochemical controls on the community structure of heterotrophic marine bacteria are not well understood, and these organisms play a critical role in the global carbon cycle. Through terminal restr...
Carbon-nitrogen coupling and algal-bacterial interactions during an experimental bloom: Modeling a 13C tracer experiment
Carbon-nitrogen coupling algal-bacterial interactions experimental bloom 13C tracer experiment
2014/5/14
We tracked flows of carbon and nitrogen during an experimental phytoplankton bloom in a natural estuarine assemblage in Randers Fjord, Denmark. We used 13C-labeled dissolved inorganic carbon to trace ...
Autochthonous versus allochthonous carbon sources to bacteria: Results from whole-lake 13C addition experiments
Autochthonous allochthonous carbon sources bacteria whole-lake 13C
2014/5/14
Organic substrates for pelagic bacteria are derived from dissolved organic carbon (DOC) in the water column. DOC is a heterogeneous mixture of molecules, some of which are imported from the watershed ...
Black carbon in estuarine and coastal ocean dissolved organic matter
Black carbon in estuarine coastal ocean dissolved organic matter
2014/5/14
We measured black carbon (BC) in ultrafiltered, high-molecular weight dissolved organic matter (UDOM) in surface waters of Delaware Bay, Chesapeake Bay, and the adjacent Atlantic Ocean (U.S.A.) to inv...
d13C of fluvial mollusk shells (Rhone River): A proxy for dissolved inorganic carbon?
d13C fluvial mollusk shells dissolved inorganic carbon
2014/5/22
The relationship between the δ13C of dissolved inorganic carbon (DIC) and modern mollusk aragonite from rivers was calibrated for the purpose of reconstructing DIC paleochemistry from the shell record...