搜索结果: 1-15 共查到“海洋科学 streams”相关记录32条 . 查询时间(0.069 秒)
Carbon cycling within epilithic biofilm communities across a nutrient gradient of headwater streams
Carbon cycling within epilithic biofilm communities across a nutrient gradient headwater streams
2014/4/17
Primary production (PP), nutrient uptake, and carbon (C) cycling within epilithic biofilm communities were assessed in four headwater streams in the Arkansas Ozarks, U.S.A., representing a hundred-fol...
Effects of seasonality and resource limitation on organic matter turnover by Chironomidae (Diptera) in southern Appalachian headwater streams
seasonality resource limitation Chironomidae in southern Appalachian headwater streams
2014/4/17
Despite their high abundance, secondary production, and known reliance on detrital material, the role of chironomids (Diptera) in fine particulate organic matter (FPOM) dynamics has not been well quan...
Assessing ecological responses to catastrophic amphibian declines: Patterns of macroinvertebrate production and food web structure in upland Panamanian streams
Assessing ecological responses catastrophic amphibian declines
2014/4/17
As part of the Tropical Amphibian Declines in Streams (TADS) project, we estimated macroinvertebrate
production and constructed quantitative food webs for four headwater stream reaches in the Panaman...
Estimating the Surface Transport of Meandering Oceanic Jet Streams from Satellite Altimetry：Surface Transport Estimates for the Gulf Stream and Kuroshio Extension
Surface Transport Estimates Kuroshio Extension Gulf Stream Oceanic Jet Streams
2008/12/27
A method has been developed to detect the location, width maximum velocity, and suffice transport of a meandering oceanic jet stream from satellite altimetry. Ale method is based on a nonlinear least ...
An assessment of nitrogen removal from headwater streams in an agricultural watershed, northeast Ohio, U.S.A.
An assessment of nitrogen removal headwater streams agricultural watershed northeast Ohio U.S.A.
2014/4/21
The objective of this project was to assess in-stream nitrogen removal capacity in a fragmented agricultural landscape and to compare removal capacities in streams with agricultural or residential (he...
Assimilatory uptake rather than nitrification and denitrification determines nitrogen removal patterns in streams of varying land use
Assimilatory uptake nitrification denitrification deter nitrogen removal patterns in streams of varying land use
2014/4/18
Agricultural and urban land use increase nitrogen (N) concentrations in streams, which can saturate biotic demand by plants, algae, and bacteria via assimilative uptake, and by nitrification and denit...
An assessment of nitrogen removal from headwater streams in an agricultural watershed, northeast Ohio, U.S.A.
nitrogen removal headwater streams an agricultural watershed northeast Ohio U.S.A.
2014/4/18
The objective of this project was to assess in-stream nitrogen removal capacity in a fragmented agricultural landscape and to compare removal capacities in streams with agricultural or residential (he...
Nitrogen dynamics in grassland streams along a gradient of agricultural development
Nitrogen dynamics grassland streams gradient of agricultural development
2014/4/22
We examined nitrogen (N) uptake in seven grassland streams lying in catchments along a gradient (0-84%) of agricultural land use in New Zealand using a stable isotope (15N) addition of NH4+ to quantif...
Controls on spatial and temporal variation of nutrient uptake in three Michigan headwater streams
Controls on spatial nutrient uptake
2014/4/22
We measured whole-stream uptake of ammonium (NHz
4
), nitrate (NO{
3
), and phosphate (as soluble reactive
phosphorus [SRP]) in two reaches of three forested headwater streams eight times from Ma...
Photochemical control of copper complexation by dissolved organic matter in Rocky Mountain streams, Colorado
Photochemical control of copper complexation dissolved organic matter Rocky Mountain streams Colorado
2014/4/23
We investigated photochemical, seasonal, and source effects on copper (Cu) complexation by dissolved organic matter (DOM). Cu-DOM complexation regulates Cu toxicity by decreasing the activity of the c...
Effects of upstream lakes on dissolved organic matter in streams
Effects of upstream lakes dissolved organic matter streams
2014/4/22
We examined the effects of upstream lakes on dissolved organic matter (DOM) quantity and the absorbance of ultraviolet (UV) radiation in the streams of northern Michigan. We assessed DOM concentration...
Effects of upstream lakes on dissolved organic matter in streams
Effects of upstream lakes dissolved organic matter in streams
2014/4/22
We examined the effects of upstream lakes on dissolved organic matter (DOM) quantity and the absorbance of ultraviolet (UV) radiation in the streams of northern Michigan. We assessed DOM concentration...
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 ...
The influence of stream age and environmental variables in structuring meiofaunal assemblages in recently deglaciated streams
The influence of stream age environmental variables structuring meiofaunal assemblages recently deglaciated streams
2014/5/4
The influence of stream age and environmental variables on meiofaunal assemblages were examined for 15 streams across a temporal gradient of 200 yr in Glacier Bay National Park, southeast Alaska. Meio...
Regulation of nutrient uptake in eutrophic lowland streams
Regulation of nutrient uptake eutrophic lowland streams
2014/5/4
We studied nutrient uptake in relation to water chemistry, stream hydrodynamics, and ecosystem metabolism in two eutrophic lowland streams located near Berlin, Germany. Ambient nutrient uptake rates r...