搜索结果: 181-195 共查到“理学 Community”相关记录202条 . 查询时间(0.061 秒)
Interactive regulation of dissolved copper toxicity by an estuarine microbial community
Interactive regulation copper toxicity estuarine microbial community
2014/5/19
Cultured marine microorganisms under copper stress produce extracellular compounds having a high affinity for copper (copper-complexing ligands). These ligands are similar in binding strength to those...
Changes to zooplankton community structure following colonization of a small lake by Leptodora kindti
zooplankton colonization
2014/5/16
The predaceous cladoceran Leptodora kindti (Focke) became established in Third Sister Lake, Michigan, after
individuals escaped from experimental enclosures in 1987. By 1988, the Leptodora population...
Spring phytoplankton bloom dynamics in Norwegian coastal waters: Microbial community succession and diversity
Spring phytoplankton bloom Norwegian coastal waters
2014/5/14
Most studies of spring bloom succession in Norwegian waters have employed light microscopy and accounted
for species composition of phyto- and zooplankton. Flow cytometry and molecular tools enable u...
Effects of ultraviolet-B radiation and vertical mixing on nitrogen uptake by a natural planktonic community shifting from nitrate to silicic acid deficiency
ltraviolet-B radiation vertical mixing
2014/5/20
We investigated the combined effects of mixing regimes and ultraviolet-B radiation (UVBR: 280–320 nm) on
the uptake of nitrate, ammonium, and urea by an estuarine phytoplankton community during a 10-...
Enhanced phosphorus accumulation efficiency by the pelagic community at reduced phosphorus supply: A lake experiment from bacteria to metazoan zooplankton
Enhanced phosphorus accumulation efficiency the pelagic community reduced phosphorus A lake experiment bacteria to metazoan zooplankton
2014/5/20
The effects of experimentally reduced total phosphorus concentrations (TP) from 2.4 to 0.6 μmol L-1 on plankton community in a shallow lake were evaluated from the proportion between dissolved reactiv...
Community Structure of Macrobenthos of a Southeast Texas Sand-Pit Lake Related to Water Temperature, pH and Dissolved Oxygen Concentration
macrobenthos sand-pit lake temperature dissolved oxygen and community structure
2010/3/30
Water temperature (°C), pH, dissolved oxygen concentration (mg/l) and the community structure of the macrobenthos of a small southeast Texas sand-pit (Barry's) lake were studied from June 1995 to Febr...
Sequential resuspension of protists by accelerating tidal flow: Implications for community structure in the benthic boundary layer
Sequential resuspension protists accelerating tidal flow community structure benthic boundary layer
2014/5/27
We measured resuspension thresholds of protists and bacteria at a subtidal coastal site with in situ flumes and by sampling the benthic boundary layer during tidal accelerations. Heterotrophic nanofla...
Light availability indirectly limits herbivore growth and abundance in a high rocky intertidal community during the winter
Light availability indirectly limits herbivore growth high rocky intertidal community the winter
2014/5/27
Light availability and consumer pressure are fundamental factors that structure aquatic communities, but their integrated effects are rarely studied in marine benthic systems. Using a factorial experi...
Top-down control of phytoplankton biomass and community structure in the monsoonal Arabian Sea
Top-down control phytoplankton biomass community structure monsoonal Arabian Sea
2014/5/26
During the 1995 monsoons, phytoplankton biomass was low over large areas of the Arabian Sea in spite of often high concentrations of inorganic nutrients, characteristics typical of high-nutrient, lowc...
Evaluation of community respiratory mechanisms with oxygen isotopes: A case study in Lake Kinneret
community respiratory mechanisms oxygen isotopes Lake Kinneret
2014/5/26
Gross and net O2 production between May 1996 and February 1999 was determined in bottle incubation experiments with H218O spike and from the change in O2 concentration. Carbon fixation rates were obta...
A transplant experiment to identify the factors controlling bacterial abundance, activity, production, and community composition in a eutrophic canyon-shaped reservoir
transplant experiment factors controlling bacterial abundance activity production community composition eutrophic canyon-shaped reservoir
2014/5/26
We performed a transplant experiment in eutrophic Sau reservoir to assess the factors that control bacterial abundance, activity, growth rate, and community composition. Samples from the lacustrine an...
Global net community production estimated from the annual cycle of surface water total dissolved inorganic carbon
Global net community annual cycle surface water total dissolved inorganic carbon
2014/6/9
Global net community production is determined, for the first time, from the decrease in salinity (S)-normalized total dissolved inorganic carbon (NCT = CT X 35/S) inventory in the surface mixed layer ...
Response of marine bacterial community composition to iron additions in three iron-limited regimes
marine bacterial community iron additions three iron-limited regimes
2014/6/9
In high-nutrient low-chlorophyll (HNLC) regimes, iron additions consistently result in primary productivity increases, and the phytoplankton community shifts from small species toward large diatoms. H...
The metabolic balance of the planktonic community in the North Atlantic Subtropical Gyre: The role of mesoscale instabilities
The metabolic balance the planktonic community North Atlantic Subtropical Gyre mesoscale instabilities
2014/6/9
We have studied the net community production (NCP) balance in the Eastern region of the Subtropical North Atlantic during two cruises, in August 1998 and April 1999. In August, heterotrophic bacteria ...
Effects of N : P ratio and total nutrient concentration on stream periphyton community structure, biomass, and elemental composition
total nutrient concentration elemental composition
2014/5/30
The effects of nutrient ratios on algal community structure and algal growth have been examined extensively in
lakes and marine environments, but rarely in streams. We manipulated stream water N : P ...