搜索结果: 1-15 共查到“海洋生物学 streams”相关记录15条 . 查询时间(0.187 秒)
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...
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...
Responses in dissolved nutrients and epilithon abundance to spawning salmon in Southeast Alaska streams
dissolved nutrients epilithon abundance spawning salmon Southeast Alaska streams
2014/5/8
Spawning Pacific salmon (Oncorhynchus spp.) historically transported massive quantities of marine-derived nutrients (MDN) into nutrient-poor streams of the Pacific Northwest. In southeast Alaska, we m...
Relationship between sediment organic matter, bacteria composition, and the ecosystem metabolism of alpine streams
Relationship between sediment organic matter bacteria composition the ecosystem metabolism alpine streams
2014/5/19
We tested whether sediment bacteria abundance (4',6-diamidino-2-phenylindole-stained cell counts) were related to sediment organic content (ash-free dry mass [AFDM]) in 11 nonforested streams of three...
Ecosystem metabolism controls nitrogen uptake in streams in Grand Teton National Park, Wyoming
Ecosystem metabolism controls nitrogen uptake streams Grand Teton National Park Wyoming
2014/5/20
Streams and rivers regulate nitrogen transport (N) to downstream ecosystems. Rates of N uptake can be high in streams, but controls on the variation in uptake rates of N among streams are not known. W...
Reach-scale manipulations show invertebrate grazers depress algal resources in streams
Reach-scale manipulations show invertebrate grazers depress algal resources in streams
2014/5/27
Experimental tools that enable manipulations of organisms at larger scales allow for comparisons of processes across multiple spatial scales and expand our ability to make predictions about ecological...
Relating nutrient uptake with transient storage in forested mountain streams
nutrient uptake transient storage forested mountain streams
2014/5/26
Streams control the timing and delivery of fluvial nutrient export from watersheds, and hydraulic processes such as transient storage may affect nutrient uptake and transformation. Although we expect ...
Landscape variation in phosphorus concentration and effects on detritus-based tropical streams
Landscape variation phosphorus concentration on detritus-based tropical streams
2014/5/26
Landscape-scale variation in streamwater phosphorus (P) concentration can affect aquatic food webs. Such variation occurs naturally in streams at La Selva Biological Station in Costa Rica due to spati...
Use of size spectra and empirical models to evaluate trophic relationships in streams
size spectra trophic relationships in streams
2014/6/9
We measured the biomass size distributions of algae, protozoa, and invertebrates in several streams of Eastern Ontario and Western Quebec and related assemblage biomass to nutrient (nitrogen and phosp...
Whole-stream metabolism in two montane streams: Contribution of the hyporheic zone
Whole-stream metabolism two montane streams Contribution of the hyporheic zone
2014/6/9
We used whole-stream and benthic chamber methods to measure rates of metabolism and determine the contribution of the hyporheic zone to ecosystem respiration (R) in two streams with differing surface-...