搜索结果: 1-15 共查到“海洋生物学 an isotope”相关记录16条 . 查询时间(0.078 秒)
Midwater zooplankton and suspended particle dynamics in the North Pacific Subtropical Gyre: A stable isotope perspective
North Pacific Subtropical Gyre Midwater zooplankton
2014/4/2
We used amino acid (AA) compound-specific isotope analysis (d15NAA and d13
CAA values) of midwater
zooplankton and suspended particles to examine their dynamics in the mesopelagic zone. Suspended pa...
Sulfur stable isotope indicators of residency in estuarine fish
Sulfur stable isotope indicators of residency estuarine fish
2014/4/4
Estuarine fish may remain as residents in areas with favorable conditions for feeding and refuge, but become mobile and transient where conditions are less favorable. We developed a new approach invol...
Sedimented cyanobacterial detritus as a source of nutrient for submerged macrophytes (Vallisneria spiralisandElodea nuttallii): An isotope labeling experiment using 15N
Sedimented cyanobacterial detritus a source of nutrient submerged macrophytes An isotope labeling experiment
2014/4/16
A tracer experiment using the nitrogen isotope15N investigated the uptake and incorporation of nitrogen from sedimented cyanobacterial detritus by two species of submerged macrophytes, the nativeValli...
Nutritional importance of benthic bacteria for deep-sea nematodes from the Arctic ice margin: Results of an isotope tracer experiment
Nutritional importance benthic bacteria deep-sea nematodes the Arctic ice margin Results an isotope
2014/4/16
A stable isotope (13C)-labeling experiment was performed to quantify the importance of bacterial carbon as a food source for an Arctic deep-sea nematode community. Bacterial functional groups were iso...
Nitrogen and oxygen isotope fractionation during dissimilatory nitrate reduction by denitrifying bacteria
Nitrogen and oxygen isotope fractionation dissimilatory nitrate reduction denitrifying bacteria
2014/4/21
We report the first measurements of coupled nitrogen (N) and oxygen (O) isotope fractionation of nitrate by laboratory cultures of denitrifying bacteria. Two seawater strains (Pseudomonas stutzeri, Oc...
Characterization of methanogenic Archaea and stable isotope fractionation during methane production in the profundal sediment of an oligotrophic lake (Lake Stechlin, Germany)
methanogenic Archaea stable isotope fractionation during methane production profundal sediment an oligotrophic lake
2014/4/22
The methanogenic archaeal community, methane production, and carbon isotopic fractionation were studied in the profundal sediments of oligotrophic Lake Stechlin. Because the water column of oligotroph...
Bicarbonate transport and extracellular carbonic anhydrase activity in Bering Sea phytoplankton assemblages: Results from isotope disequilibrium experiments
Bicarbonate transport extracellular carbonic anhydrase activity Bering Sea phytoplankton assemblages isotope disequilibrium experiments
2014/5/5
We used a 14C isotope disequilibrium technique to provide quantitative estimates of both direct HCO3- transport and extracellular CA activity in Bering Sea phytoplankton assemblages. The method reveal...
Changes in carbon stable isotope ratios during periphyton development
carbon stable isotope ratios periphyton development
2014/5/5
Stable isotopes are widely used to infer trophic relationships with little attention paid to temporal variability at the base of the food web. We examined changes in the carbon-stable isotope composit...
The fate of bacterial carbon in an intertidal sediment: Modeling an in situ isotope tracer experiment
The fate of bacterial carbon an intertidal sediment: Modeling an situ isotope tracer experiment
2014/5/4
We report the results of an integrated modeling and in situ isotope tracer experiment study examining the fate of bacterial carbon in an intertidal sediment. 13C-glucose was injected into the upper 10...
Compositional and inter-lake variability of zooplankton affect baseline stable isotope signatures
Compositional and inter-lake variability zooplankton baseline stable isotope signatures
2014/5/21
Zooplankton are commonly used to establish a baseline isotopic signature for pelagic production in lakes. Our objective was to evaluate this approach by quantifying among-lake and within-lake variabil...
Stable carbon and nitrogen isotope composition of aquatic and terrestrial plants of the San Francisco Bay estuarine system
Stable carbon nitrogen isotope composition aquatic and terrestrial plants San Francisco Bay estuarine system
2014/5/27
We report measurements of seasonal variability in the C-N stable isotope ratios of plants collected across the habitat mosaic of San Francisco Bay, its marshes, and its tributary river system. Analyse...
Ammonium uptake by seagrass epiphytes: Isolation of the effects of water velocity using an isotope label
Ammonium uptake seagrass epiphytes water velocity isotope label
2014/5/27
In a series of flume experiments, 15N-labeled ammonium was used to isolate the effects of water velocity on ammonium uptake by epiphytes from that of an assemblage of organisms that included seagrass ...
Stable isotope signatures of lotic invertebrates: Sources of variation, experimental design, and statistical interpretation
Stable isotope signatures lotic invertebrates Sources of variation, experimental design statistical interpretation
2014/6/9
In a subset of a stream food web, whole-body isotope values of d13C and d15N were measured for eight populations of lotic invertebrates. Observed isotopic differences among species corresponded broadl...
Bivalve diets in a midwestern U.S. stream: A stable isotope enrichment study
Bivalve diets midwestern U.S. stream A stable isotope enrichment study
2014/6/9
This study examined a community of stream bivalves (unionids and fingernail clams) in a second-order woodland stream in southern Michigan using both the natural abundance of 15N and a 6-week whole-str...
Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis
Seasonal changes importance of the source organic matter diet of zooplankton Loch Ness stable isotope analysis
2014/6/9
Seasonal variations in the stable isotope composition (d13C and d15C) of crustacean zooplankton and their putative food sources in oligotrophic Loch Ness were recorded during 1998. Bulk particulate or...