搜索结果: 121-135 共查到“海洋科学 phytoplankton”相关记录224条 . 查询时间(0.102 秒)
Efficiency of a phytoplankton-based and a bacterial-based food web in a pelagic marine system
Efficiency of a phytoplankton-based bacterial-based food web pelagic marine system
2014/4/22
The food web efficiency in two contrasting food webs, one phytoplankton based and one bacteria based, was studied in a mesocosm experiment using seawater from the northern Baltic Sea. Organisms includ...
Gross photosynthesis and lake community metabolism during the spring phytoplankton bloom
Gross photosynthesis lake community metabolism spring phytoplankton bloom
2014/5/5
Daily productivity determinations of linear photosynthetic electron transfer and of net and gross inorganic CO2 uptake were determined in situ throughout a 6-week sampling period of the spring phytopl...
Inorganic carbon uptake and intracellular assimilation by subarctic Pacific phytoplankton assemblages
Inorganic carbon uptake intracellular assimilation subarctic Pacific phytoplankton assemblages
2014/5/5
We report the results of inorganic carbon (C) uptake experiments and activity measurements for carbonic anhydrase, ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco), and phosphoenolpyruvate ca...
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...
Irradiance and the elemental stoichiometry of marine phytoplankton
elemental stoichiometry marine phytoplankton
2014/5/5
We analyzed the elemental composition (C, N, P, S, K, Mg, Ca, Sr, Fe, Mn, Zn, Cu, Co, Mo, and Ni) of five
marine phytoplankton species representing the four major marine phyla grown over a range of g...
Uptake of Spartina-derived humic nitrogen by estuarine phytoplankton in nonaxenic and axenic culture
Spartina-derived humic nitrogen estuarine phytoplankton nonaxenic and axenic culture
2014/5/5
Humic substances are a collection of colored organic acids characterized by high molecular weight and low nitrogen (N) content that are thought to be biologically recalcitrant. We examined a suite of ...
To sink or to be lysed? Contrasting fate of two large phytoplankton species in Lake Biwa
lysed phytoplankton species
2014/5/5
We estimated the contributions of sedimentation and cell lysis to the loss of two large phytoplankton species
(Fragilaria crotonensis and Staurastrum dorsidentiferum) in Lake Biwa. Major loss process...
Phytoplankton essential fatty acid and phosphorus content constraints on Daphnia somatic growth and reproduction
Phytoplankton essential fatty acid phosphorus content constraints Daphnia somatic growth reproduction
2014/5/5
We performed 12 experiments where the herbivorous zooplankter Daphnia pulex was fed three different phytoplankton food types (cyanophytes, chlorophytes, or cryptophytes) at two phosphorus (P) deficien...
Forming the primary nitrite maximum: Nitrifiers or phytoplankton?
nitrite maximum Nitrifiers phytoplankton
2014/5/5
As intermediary in a number of key biological processes, the dynamics of oceanic NO2- concentrations have historically been used as an indicator of the balance between oxidative and reductive pathways...
Red and black tides: Quantitative analysis of water-leaving radiance and perceived color for phytoplankton, colored dissolved organic matter, and suspended sediments
Red and black tides water-leaving radiance
2014/5/5
Using field measurements and quantitative modeling, we demonstrate that red coloration of the sea surface is
not associated with any particular group of phytoplankton and is strongly dependent on the...
The effect of seawater CO2 concentration on growth of a natural phytoplankton assemblage in a controlled mesocosm experiment
seawater CO2 concentration natural phytoplankton assemblage controlled mesocosm experiment
2014/5/4
We examine the effects of seawater pCO2 concentration of 25, 41, and 76 kPa (250, 400, and 750 matm) on the growth rate of a natural assemblage of mixed phytoplankton obtained from a carefully control...
Phytoplankton trapped within seagrass (Posidonia oceanica) sediments are a nitrogen source: An in situ isotope labeling experiment
Phytoplankton trapped within seagrass sediments nitrogen source: An in situ isotope labeling experiment
2014/5/4
We examined the retention of nitrogen associated with sedimented planktonic material trapped within a Mediterranean seagrass (Posidonia oceanica) meadow with the use of 15N-enriched algal material inj...
Response of Southern Ocean phytoplankton and bacterioplankton production to short-term experimental warming
Southern Ocean phytoplankton bacterioplankton production short-term experimental warming
2014/5/4
We examined the potential response of Southern Ocean pelagic ecosystems to warming through changes in total primary production (particulate plus dissolved = PPP + DPP) and bacterial production (BP), d...
Long-term temporal and spatial trends in phytoplankton biomass and class-level taxonomic composition in the hydrologically variable Neuse-Pamlico estuarine continuum, North Carolina, U.S.A.
Long-term temporal spatial trends phytoplankton biomass class-level taxonomic composition hydrologically variable Neuse-Pamlico estuarine continuum North Carolina U.S.A.
2014/5/4
Phytoplankton diagnostic photopigments in near-surface waters (~0.5 m) were identified and quantified by high-performance liquid chromatography beginning in April 1994 in the Neuse River Estuary and i...
Presence and regulation of alkaline phosphatase activity in eukaryotic phytoplankton from the coastal ocean: Implications for dissolved organic phosphorus remineralization
Presence and regulation alkaline phosphatase activity eukaryotic phytoplankton the coastal ocean Implications for dissolved organic phosphorus remineralization
2014/5/4
The biologically important constituents of the dissolved organic phosphorus (DOP) pool, their bioavailability, and their cycling in coastal systems are still poorly understood. Here we use the enzyme ...