搜索结果: 1-13 共查到“海洋生物学 their nitrogen fixation”相关记录13条 . 查询时间(0.085 秒)
Nickel limitation of nitrogen fixation inTrichodesmium
Nickel limitation nitrogen fixation Trichodesmium
2014/4/2
I show that the growth ofTrichodesmium, the primary diazotrophic phytoplankton in tropical and subtropical oceans, can be limited by Ni availability in both trace metal–defined culture media and natur...
Advective transport of diazotrophs and importance of their nitrogen fixation on new and primary production in the western Pacific warm pool
Advective transport diazotrophs importance their nitrogen fixation new primary production in the western Pacific warm pool
2014/4/2
The western Pacific warm pool (WPWP) is a region of low nutrient and chlorophyll concentrations in which new production is generally considered to be supported by upward fluxes of nitrate from the dee...
Assessing nonpoint-source nitrogen loading and nitrogen fixation in lakes using δ15N and nutrient stoichiometry
Assessing nonpoint-source nitrogen loading nitrogen fixation lakes using δ15N nutrient stoichiometry
2014/4/4
Runoff from human-dominated watersheds has greatly altered nitrogen (N) and phosphorus (P) cycling in lakes. Nutrients from human sources are distinct from those from undisturbed ecosystems in several...
Nitrogen fixation may not balance the nitrogen pool in lakes over timescales relevant to eutrophication management
Nitrogen fixation may not balance nitrogen pool in lakes over timescales relevant eutrophication management
2014/4/17
We explored multiyear linear trends in nutrient concentrations, nitrogen (N) : phosphorus (P) ratio, and phytoplankton biomass within the 37-yr, whole-ecosystem nutrient enrichment experiment in Lake ...
Nitrogen fixation along a north-south transect in the eastern Atlantic Ocean
Nitrogen fixation north-south transect eastern Atlantic Ocean
2014/4/22
Nitrogenase activity, indicative of N2 fixation, was measured in the surface waters along a north-south transect in the eastern Atlantic Ocean, from Texel (The Netherlands, 53°N) to Cape Town (South A...
Nitrogen fixation by unicellular diazotrophic cyanobacteria in the temperate oligotrophic North Pacific Ocean
Nitrogen fixation unicellular diazotrophic cyanobacteria temperate oligotrophic North Pacific Ocean
2014/4/22
N2 fixation has been understudied in marine environments outside of the subtropical and tropical oceans and where water temperatures are typically below 20-25°C. We identified nifH phylotypes and meas...
Biogeochemical budgets in the eastern boundary current system of the North Atlantic: Evidence of net heterotrophy and nitrogen fixation
Biogeochemical budgets the eastern boundary current system the North Atlantic:net heterotrophy and nitrogen fixation
2014/4/22
Thermohaline and chemical data from three WOCE (World Ocean Circulation Experiment) cruises conducted in 1997 and 1998 define the MedBox region, bounded by the Strait of Gibraltar, 24°N, 41°N, and 22°...
Temperature and nutrient supply interact to control nitrogen fixation in oligotrophic streams: An experimental examination
Temperature and nutrient supply control nitrogen fixation oligotrophic streams
2014/5/5
We performed two experiments to examine how temperature and nutrients interact to control dinitrogen (N2) fixation, chlorophyll a (Chl a) biomass, and community composition of periphyton in subalpine ...
Spatial variation of nitrogen fixation in lakes of the northern Great Plains
Spatial variation nitrogen fixation the northern Great Plains
2014/5/4
Cyanobacterial blooms are a regular feature of lakes in central North America, but little is known of their importance to the nitrogen (N) cycle and nutrition of aquatic food webs. We hypothesized tha...
Nitrogen fixation and release of fixed nitrogen by Trichodesmium spp. in the Gulf of Mexico
Nitrogen fixation release fixed nitrogen Trichodesmium spp. Gulf of Mexico
2014/5/4
During a 3-yr study in the Gulf of Mexico, we measured dinitrogen (N2) fixation and nitrogen (N) release by Trichodesmium and compared these rates with water column N demand and the estimated N necess...
Stimulation of nitrogen fixation in refractory organic sediments by Caulerpa taxifolia (Chlorophyta)
Stimulation of nitrogen fixation refractory organic sediments Caulerpa taxifolia Chlorophyta
2014/5/20
Estimates of N2 fixation by substrata associated with the rhizophytic alga Caulerpa taxifolia were obtained using the acetylene reduction method. On average, growth of C. taxifolia enhanced rates of a...
Iron availability, cellular iron quotas, and nitrogen fixation in Trichodesmium
Iron availability cellular iron quotas nitrogen fixation Trichodesmium
2014/6/9
Iron availability is suggested to be a primary factor limiting nitrogen fixation in the oceans. This hypothesis is principally based on cost-benefit analyses of iron quotas in the dominant nitrogen-fi...
Baltic Sea nitrogen fixation estimated from the summer increase in upper mixed layer total nitrogen
Baltic Sea nitrogen fixation the summer increase upper mixed layer total nitrogen
2014/6/9
We estimated nitrogen fixation from the increase in total nitrogen (N2 gas excluded) in the upper 20 m during the summer biomass increase of heterocystous filamentous cyanobacteria at the off-shore La...