搜索结果: 121-135 共查到“海洋生物学 Marine”相关记录169条 . 查询时间(0.377 秒)
Evidence for visual constraints in large marine fish stocks
Evidence for visual constraints large marine fish stocks
2014/4/22
I tested the hypothesis that the abundance of visually constrained fish stocks relate inversely to light attenuation for the Black Sea, where long time series of fish stocks and Secchi depths are avai...
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...
Significance of subcellular metal distribution in prey in influencing the trophic transfer of metals in a marine fish
subcellular metal distribution in prey trophic transfer metals in a marine fish
2014/5/5
We investigated how the subcellular metal distribution in prey affects metal dietary assimilation in a marine fish, the grunt Terapon jarbua. The assimilation efficiency (AE) of metals (Cd, Se, and Zn...
Variation in the transfer of energy in marine plankton along a productivity gradient in the Atlantic Ocean
the transfer of energy marine plankton productivity gradient Atlantic Ocean
2014/5/5
Plankton play a key role in oceanic carbon flux as the primary biological mechanism for the sequestration of carbon out of the atmosphere into surface waters. The transfer of energy between phytoplank...
Photoacclimation modulates excessive photosynthetically active and ultraviolet radiation effects in a temperate and an Antarctic marine diatom
Photoacclimation modulates excessive photosynthetically active ultraviolet radiation effects temperate and an Antarctic marine diatom
2014/5/4
The influence of photoacclimation on the effects of excessive photosynthetically active (PAR; 400-700 nm) and ultraviolet (UVR; 280-400 nm) radiation was assessed for the marine diatoms Thalassiosira ...
Photobehavior as an inducible defense in the marine copepod Calanopia americana
Photobehavior as an inducible defense in the marine copepod Calanopia americana
2014/5/9
The photoresponses of Calanopia americana involved in diel vertical migration (DVM) were tested after exposure of copepods to the following predator kairomones: (1) crude body mucus from fish (Fundulu...
Extracellular production of superoxide by marine diatoms: Contrasting effects on iron redox chemistry and bioavailability
Extracellular production of superoxide marine diatoms Contrasting effects iron redox chemistry and bioavailability
2014/5/9
We report the extracellular production of superoxide in cultures of the marine diatoms Thalassiosira weissflogii and Thalassiosira pseudonana. In EDTA-buffered media with ~45 pmol L-1 iron (Fe)(III)',...
Siliceous sponges as a silicon sink: An overlooked aspect of the benthopelagic coupling in the marine silicon cycle
Siliceous sponges silicon sink bathypelagic coupling marine silicon cycle
2014/5/9
Our current understanding of the silicon (Si) cycle in the ocean assumes that diatoms dominate not only the uptake of silicic acid, but also the production and recycling of biogenic silica (BSi), and ...
Respiration in marine zooplankton-the other side of the coin: CO2 production
marine zooplankton-the other side coin CO2 production
2014/5/8
We measured respiratory release rates of CO2 from various taxonomic groups of zooplankton during three cruises in winter, spring, and summer in the North Atlantic Ocean. Zooplankton species collected ...
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 ...
Denitrification and anammox activity in Arctic marine sediments
Denitrifi cation anammox activity
2014/5/19
We measured rates of N2
production through anaerobic NH oxidation with NO (anammox) and denitrification 1 2
4 2
in permanently cold (from 21.78C to 48C) sediments off the east and west coasts...
Quantification of marine snow fragmentation by swimming euphausiids
marine snow fragmentation swimming euphausiids
2014/5/19
Sinking of marine snow is a major mechanism of particulate carbon transport from surface waters to the seafloor. Any process altering the abundance or size of marine snow influences carbon flux and fo...
Diel variation of molybdenum and iron in marine diazotrophic cyanobacteria
molybdenum iron marine diazotrophic cyanobacteria
2014/5/19
Measurements of Mo:C and Fe :C ratios in cultured cells of two N2-fixing cyanobacteria, Crocosphaera watsonii strain WH8501 and Trichodesmium erythraeum strain IMS101, agree with estimated metal : car...
Diurnal cycling of glutathione in marine phytoplankton: Field and culture studies
glutathione marine phytoplankton Field culture
2014/5/19
Glutathione is an abundant intracellular thiol that is involved in the detoxification of reactive oxygen species generated in the presence of light. We used short-term continuous cultures of Emiliania...
The demise of the marine cyanobacterium, Trichodesmium spp., via an autocatalyzed cell death pathway
marine cyanobacterium Trichodesmium spp. uncatalyzed cell death pathway
2014/5/19
We present experimental laboratory evidence and field observations of an autocatalyzed, programmed cell death (PCD) pathway in the nitrogen-fixing cyanobacterium Trichodesmium spp., which forms massiv...