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Articles 1 - 15 of 15
Full-Text Articles in Entire DC Network
Relative Changes In Krillabundance Inferred From Antarctic Fur Seal, T. Huang, L. Sun, John M. Stark, Y. Wang, Z. Cheng, Q. Yang, S. Sun
Relative Changes In Krillabundance Inferred From Antarctic Fur Seal, T. Huang, L. Sun, John M. Stark, Y. Wang, Z. Cheng, Q. Yang, S. Sun
John M. Stark
No abstract provided.
Discontinuities In Stream Nutrient Uptake Below Lakesin Mountain Drainage Networks, Michelle A. Baker
Discontinuities In Stream Nutrient Uptake Below Lakesin Mountain Drainage Networks, Michelle A. Baker
Michelle A. Baker
In many watersheds, lakes and streams are hydrologically linked in spatial patterns that influence material transport and retention. We hypothesized that lakes affect stream nutrient cycling via modifications to stream hydrogeomorphology, source‐waters, and biological communities. We tested this hypothesis in a lake district of the Sawtooth Mountains, Idaho. Uptake of NO3− and PO4−3 was compared among 25 reaches representing the following landscape positions: lake inlets and outlets, reaches >1‐km downstream from lakes, and reference reaches with no nearby lakes. We quantified landscape‐scale hydrographic and reach‐scale hydrogeomorphic, source‐water, and biological variables to characterize these landscape positions and analyze relationships to nutrient …
Controls On Nitrogen Cycling In Terrestrial Ecosystems: A Synthetic Analysis Of Literature Data, M. S. Booth, John M. Stark, E. Rastetter
Controls On Nitrogen Cycling In Terrestrial Ecosystems: A Synthetic Analysis Of Literature Data, M. S. Booth, John M. Stark, E. Rastetter
John M. Stark
No abstract provided.
Improving Quantitative Understanding Using Spreadsheet Models, Michelle A. Baker
Improving Quantitative Understanding Using Spreadsheet Models, Michelle A. Baker
Michelle A. Baker
No abstract provided.
Regulation Of Nitric Oxide Emissions From Forest And Rangeland Soils Of Western North America, John M. Stark, D. R. Smart, S. C. Hart, K. A. Haubensak
Regulation Of Nitric Oxide Emissions From Forest And Rangeland Soils Of Western North America, John M. Stark, D. R. Smart, S. C. Hart, K. A. Haubensak
John M. Stark
Nitric oxide (NO) is a relatively short-lived trace gas that reacts with oxygen in the troposphere to produce the air pollutant ozone. It also reacts with water vapor to form nitric and nitrous acids, which acidify precipitation and increase N deposition. Models currently used to predict soil NO fluxes are based on the assumption that NO flux is proportional to the gross rate of nitrification or N mineralization; however, this assumption has not been tested because of the difficulty in measuring gross N-cycling rates in situ. We measured soil NO fluxes, gross and net N-cycling rates, and a variety of …
Ecology Readings From The University Of Wisconsin, Michelle A. Baker
Ecology Readings From The University Of Wisconsin, Michelle A. Baker
Michelle A. Baker
No abstract provided.
Organic Carbon Supply And Metabolism In A Shallow Groundwater Ecosystem, Michelle A. Baker
Organic Carbon Supply And Metabolism In A Shallow Groundwater Ecosystem, Michelle A. Baker
Michelle A. Baker
In groundwater ecosystems, in situ primary production is low, and metabolism depends on organic matter inputs from other regions of the catchment. Heterotrophic metabolism and biogeochemistry in the floodplain groundwater of a headwater catchment (Rio Calaveras, New Mexico, USA) were examined to address the following questions: (1) How do groundwater metabolism and biogeochemistry vary spatially and temporally? (2) What factors influence groundwater metabolism? (3) What is the energy source for groundwater metabolism?
Acetate Retention And Metabolism In Thehyporheic Zone Of A Mountain Stream, Michelle A. Baker
Acetate Retention And Metabolism In Thehyporheic Zone Of A Mountain Stream, Michelle A. Baker
Michelle A. Baker
An in situ acetate injection was used to determine the influence of labile dissolved organic carbon (DOC) availability on microbial respiration in the hyporheic zone of a headwater stream. We added bromide as a conservative tracer and acetate as an organic substrate to the hyporheic zone of Rio Calaveras, New Mexico, via an injection well. Tracer was observed in four of eight capture wells. Three of the four wells showed increases in bromide without concurrent increases in acetate concentration, suggesting 100% acetate retention. One well had 38% acetate retention. Pore velocity and acetate retention were negatively correlated, suggesting hydrologic control …
Foraminiferal Biofacies On A North Coast Fringing Reef (1-75m), Discovery Bay, Jamaica, R. E. Martin, W. D. Liddell
Foraminiferal Biofacies On A North Coast Fringing Reef (1-75m), Discovery Bay, Jamaica, R. E. Martin, W. D. Liddell
W. David Liddell
No abstract provided.
Evidence That Elevated Co2 Leveles And Indirectly Increase Rhizosphere Denitrifier Activity, D. Smart, K. Ritchie, John M. Stark, Bruce Bugbee
Evidence That Elevated Co2 Leveles And Indirectly Increase Rhizosphere Denitrifier Activity, D. Smart, K. Ritchie, John M. Stark, Bruce Bugbee
John M. Stark
No abstract provided.
Mechanisms For Soil Moisture Effects On Activity Of Nitrifying Bacteria, John M. Stark, M. K. Firestone
Mechanisms For Soil Moisture Effects On Activity Of Nitrifying Bacteria, John M. Stark, M. K. Firestone
John M. Stark
Moisture may limit microbial activity in a wide range of environments including salt water, food, wood, biofilms, and soils. Low water availability can inhibit microbial activity by lowering intracellular water potential and thus reducing hydration and activity of enzymes. In solid matrices, low water content may also reduce microbial activity by restricting substrate supply. As pores within solid matrices drain and water films coating surfaces become thinner, diffusion path lengths become more tortuous, and the rate of substrate diffusion to microbial cells declines. We used two independent techniques to evaluate the relative importance of cytoplasmic dehydration versus diffusional limitations in …
Experimental Analysis Of Abrasion And Dissolution Resistance Of Modern Reef-Dwelling Foraminifera: Implications For The Preservation Of Biogenic Carbonate, E. Kotler, R. E. Martin, W. D. Liddell
Experimental Analysis Of Abrasion And Dissolution Resistance Of Modern Reef-Dwelling Foraminifera: Implications For The Preservation Of Biogenic Carbonate, E. Kotler, R. E. Martin, W. D. Liddell
W. David Liddell
No abstract provided.
Microhabitat Analyses Of Silurian Stromatoporoids As Substrata For Epibionts, M. T. Segars, W. D. Liddell
Microhabitat Analyses Of Silurian Stromatoporoids As Substrata For Epibionts, M. T. Segars, W. D. Liddell
W. David Liddell
No abstract provided.
Hard Substrata Community Patterns, 1-120m, North Jamaica, W. D. Liddell, S. L. Ohlhorst
Hard Substrata Community Patterns, 1-120m, North Jamaica, W. D. Liddell, S. L. Ohlhorst
W. David Liddell
No abstract provided.
Back Reef And Fore Reef Analogs In The Pleistocene Of North Jamaica: Implications For Facies Recognition And Sediment Flux In Fossil Reefs, S. K. Boss, W. D. Liddell
Back Reef And Fore Reef Analogs In The Pleistocene Of North Jamaica: Implications For Facies Recognition And Sediment Flux In Fossil Reefs, S. K. Boss, W. D. Liddell
W. David Liddell
No abstract provided.