搜索结果: 1-15 共查到“理学 food webs”相关记录18条 . 查询时间(0.089 秒)
University of Delaware doctoral student Desiree Narango is researching trees and shrubs planted in the lawns of homeowners throughout the Washington, D.C., Maryland and northern Virginia areas to asse...
Energy Transfer Through Food Webs at Hydrothermal Vents:Linking the Lithosphere to the Biosphere
Energy Transfer Food Webs Hydrothermal Vents Lithosphere Biosphere
2015/7/14
Tectonic and volcanic processes that drive hydrothermal fluid flow and influence its chemistry also regulate the transfer of energy to hydrothermal vent ecosystems. Chemoautotrophic bacteria use the c...
Isotopic invisibility of protozoan trophic steps in marine food webs
A plain Marine food web
2014/10/16
According to modern oceanographic perspectives that emphasize microbial pathways, phagotrophic protists
comprise one to several levels of intermediate consumers between phytoplankton and larger metaz...
Fatty acid and stable isotope biomarkers suggest microbe-induced differences in benthic food webs between depths
Fatty acid stable isotope biomarkers microbe-induced differences benthic food webs depths
2014/4/2
Benthic marine consumers inhabiting the subphotic zone rely on subsidies of energy synthesized by macrophytes and phytoplankton in the photic zone. The effects of this energy subsidy on the trophic ec...
Random Sequential Generation of Intervals for the Cascade Model of Food Webs
food chain asymptotic length Poisson approximation Sequential interval generation
2011/7/6
The cascade model generates a food web at random. In it the species are labeled from 0 to $m$, and arcs are given at random between pairs of the species. For an arc with endpoints $i$ and $j$ ($i
Temporal shift in nutrient input to cold-seep food webs revealed by stable-isotope signatures of associated communities
cold-seep food webs Temporal shift
2014/4/17
A pattern of succession has been demonstrated at Gulf of Mexico cold seeps proceeding from a high-biomass
endemic community dominated by grazers to a diverse community of endemic and nonendemic speci...
Hydrogeomorphic features mediate the effects of land use/cover on reservoir productivity and food webs
Hydrogeomorphic land use cover on reservoir productivity food webs
2014/4/18
Although effects of land use/cover on nutrient concentrations in aquaticsystems are well known, half or more of the variation in nutrient concentration remains unexplained by land use/cover alone. Hyd...
The influence of the balance of inorganic and organic nitrogen on the trophic dynamics of microbial food webs
the balance of inorganic organic nitrogen
2014/4/22
A nutrient-manipulation mesocosm study was conducted in Norwegian coastal waters to determine the effect
on a nitrogen-limited microbial food web of changes in the relative concentrations of dissolve...
The relative importance of microbial and classical food webs in a highly productive coastal upwelling area
microbial classical food webs highly productive coastal upwelling area
2014/4/22
We present an analysis of seasonal variations in the trophic pathways of carbon in a highly productive coastal upwelling region in the Humboldt current system off Chile. Seasonal changes in phytoplank...
Extreme food webs: Foraging strategies and diets of scavenging amphipods from the ocean’s deepest 5 kilometers
food webs Foraging strategies scavenging amphipods the ocean’ s deepest 5 kilometers
2014/4/22
We explore hypotheses that alternate foraging strategies, diet, or nutrient partitioning could help explain the success of scavenging Lysianassoids (Amphipoda) in hadal oligotrophic trenches (depths o...
Experimental d13 C evidence for a contribution of methane to pelagic food webs in lakes
methane to pelagic food webs Experimental
2014/5/5
We tested the hypothesis that low stable carbon isotope (d13
C) values commonly observed for zooplankton in
humic lakes are due to their feeding on isotopically light methane-oxidizing microbes, and...
Stable isotopes in subtidal food webs: Have enriched carbon ratios in benthic consumers been misinterpreted?
subtidal food webs Have enriched carbon ratios
2014/5/5
We examined the hypothesis that the d13
C of benthic consumers is depleted in offshore, deeper waters where
kelp and benthic microalgae are absent by conducting three analyses: (1) we analyzed d13
...
Relative importance of CO2 recycling and CH4 pathways in lake food webs along a dissolved organic carbon gradient
CO2 recycling CH4 pathways lake food webs a dissolved organic carbon gradient
2014/5/4
Terrestrial ecosystems export large quantities of dissolved organic carbon (DOC) to aquatic ecosystems. This DOC can serve as a resource for heterotrophic bacteria and influence whether lakes function...
Virus predation by sponges is a new nutrient-flow pathway in coral reef food webs
Virus predation by sponges new nutrient-flow pathway coral reef food webs
2014/5/4
The removal efficiency of viral particles by the coral reef sponge Negombata magnifica was measured. Virus particles were removed by the sponge at an average efficiency of 23.3% ± 2.9%. Significant am...
Trophic transfer of metals along freshwater food webs: Evidence of cadmium biomagnification in nature
Trophic transfer metals along freshwater food webs Evidence of cadmium biomagnification in nature
2014/5/13
We conducted a study with cadmium (Cd) and copper (Cu) in the delta of San Francisco Bay, using nitrogen and carbon stable isotopes to identify trophic position and food web structure. Cadmium is prog...