Now showing items 77-96 of 264

  • Family- and genus-level 16S rRNA-targeted oligonucleotide probes for ecological studies of methanotrophic bacteria 

    Gulledge, Jay; Ahmad, Azeem; Steudler, Paul A.; Pomerantz, William J.; Cavanaugh, Colleen M. (American Society for Microbiology, 2001-10)
    Methanotrophic bacteria play a major role in the global carbon cycle, degrade xenobiotic pollutants, and have the potential for a variety of biotechnological applications. To facilitate ecological studies of these important ...
  • Farm management, not soil microbial diversity, controls nutrient loss from smallholder tropical agriculture 

    Wood, Stephen A.; Almaraz, Maya; Bradford, Mark A.; McGuire, Krista L.; Naeem, Shahid; Neill, Christopher; Palm, Cheryl A.; Tully, Katherine L.; Zhou, Jizhong (Frontiers Media, 2015-03-04)
    Tropical smallholder agriculture is undergoing rapid transformation in nutrient cycling pathways as international development efforts strongly promote greater use of mineral fertilizers to increase crop yields. These changes ...
  • Fate of nitrogen in riparian forest soils and trees : an N-15 tracer study simulating salmon decay 

    Drake, Deanne C.; Naiman, Robert J.; Bechtold, J. Scott (2005-05-23)
    We introduced a 15N-NH4+ tracer to the riparian forest of a salmon-bearing stream (Kennedy Creek, Washington, USA) to quantify the cycling and fate of a late-season pulse of salmon-N, and, ultimately, mechanisms regulating ...
  • Fiddler on the roof : a northern range extension for the marsh fiddler crab Uca pugnax 

    Johnson, David S. (2014-09)
    A northern range extension is presented here for the marsh fiddler crab Uca pugnax. In summer 2014, adult crabs were found as far north as Hampton, New Hampshire (42.924428, -70.820517), which is 80 km north of its previously ...
  • Flow-weighted values of runoff tracers (δ18O, DOC, Ba, alkalinity) from the six largest Arctic rivers 

    Cooper, Lee W.; McClelland, James W.; Holmes, Robert M.; Raymond, Peter A.; Gibson, J. J.; Guay, Christopher K.; Peterson, Bruce J. (American Geophysical Union, 2008-09-20)
    We present new flow-weighted data for δ 18OH2O, dissolved organic carbon (DOC), dissolved barium and total alkalinity from the six largest Arctic rivers: the Ob', Yenisey, Lena, Kolyma, Yukon and Mackenzie. These data, ...
  • Food benefit and climate warming potential of nitrogen fertilizer uses in China 

    Tian, Hanqin; Lu, Chaoqun; Melillo, Jerry M.; Ren, Wei; Huang, Yao; Xu, Xiaofeng; Liu, Mingliang; Zhang, Chi; Chen, Guangsheng; Pan, Shufen; Liu, Jiyuan; Reilly, John M. (IOP Publishing, 2012-10-31)
    Chemical nitrogen (N) fertilizer has long been used to help meet the increasing food demands in China, the top N fertilizer consumer in the world. Growing concerns have been raised on the impacts of N fertilizer uses on ...
  • The footprint of Alaskan tundra fires during the past half-century : implications for surface properties and radiative forcing 

    Rocha, Adrian V.; Loranty, Michael M.; Higuera, Phil E.; Mack, Michelle C.; Hu, Feng Sheng; Jones, Benjamin M.; Breen, Amy L.; Rastetter, Edward B.; Goetz, Scott J.; Shaver, Gaius R. (IOP Publishing, 2012-12-19)
    Recent large and frequent fires above the Alaskan arctic circle have forced a reassessment of the ecological and climatological importance of fire in arctic tundra ecosystems. Here we provide a general overview of the ...
  • Forecasting effects of sea-level rise and windstorms on coastal and inland ecosystems 

    Hopkinson, Charles S.; Lugo, Ariel E.; Alber, Merryl; Covich, Alan P.; Van Bloem, Skip J. (Ecological Society of America, 2008-06)
    We identify a continental-scale network of sites to evaluate how two aspects of climate change – sea-level rise and intensification of windstorms – will influence the structure, function, and capacity of coastal and inland ...
  • The freshwater system west of the Antarctic Peninsula : spatial and temporal changes 

    Meredith, Michael P.; Venables, Hugh J.; Clarke, Andrew; Ducklow, Hugh W.; Erickson, Matthew; Leng, Melanie J.; Lenaerts, Jan T. M.; van den Broeke, Michiel R. (American Meteorological Society, 2013-03-01)
    Climate change west of the Antarctic Peninsula is the most rapid of anywhere in the Southern Hemisphere, with associated changes in the rates and distributions of freshwater inputs to the ocean. Here, results from the first ...
  • Future effects of ozone on carbon sequestration and climate change policy using a global biogeochemical model 

    Felzer, Benjamin S.; Reilly, John M.; Melillo, Jerry M.; Kicklighter, David W.; Sarofim, Marcus C.; Wang, C.; Prinn, Ronald G.; Zhuang, Qianlai (2004-10-29)
    Exposure of plants to ozone inhibits photosynthesis and therefore reduces vegetation production and carbon sequestration. The reduced carbon storage would then require further reductions in fossil fuel emissions to meet ...
  • Global economic effects of changes in crops, pasture, and forests due to changing climate, carbon dioxide, and ozone 

    Reilly, John M.; Paltsev, S.; Felzer, Benjamin S.; Wang, X.; Kicklighter, David W.; Melillo, Jerry M.; Prinn, Ronald G.; Sarofim, Marcus C.; Sokolov, Andrei P.; Wang, C. (2006-01)
    Multiple environmental changes will have consequences for global vegetation. To the extent that crop yields and pasture and forest productivity are affected there can be important economic consequences. We examine the ...
  • Global N removal by freshwater aquatic systems using a spatially distributed, within-basin approach 

    Wollheim, Wilfred M.; Vorosmarty, Charles J.; Bouwman, A. F.; Green, Pamela; Harrison, John A.; Linder, Ernst; Peterson, Bruce J.; Seitzinger, Sybil P.; Syvitski, James P. M. (American Geophysical Union, 2008-06-20)
    We explored the role of aquatic systems in the global N cycle using a spatially distributed, within-basin, aquatic nitrogen (N) removal model, implemented within the Framework for Aquatic Modeling in the Earth System ...
  • The green algal underground : evolutionary secrets of desert cells 

    Cardon, Zoe G.; Gray, Dennis W.; Lewis, Louise A. (American Institute of Biological Sciences, 2008-02)
    Microscopic, unicellular, free-living green algae are found in desert microbiotic crusts worldwide. Although morphologically simple, green algae in desert crusts have recently been found to be extraordinarily diverse, with ...
  • Greening China naturally 

    Cao, Shixiong; Sun, Ge; Zhang, Zhiqiang; Chen, Liding; Feng, Qi; Fu, Bojie; McNulty, Steve; Shankman, David; Tang, Jianwu; Wang, Yanhui; Wei, Xiaohua (2011-04)
    China leads the world in afforestation, and is one of the few countries whose forested area is increasing. However, this massive ‘‘greening’’ effort has been less effective than expected; afforestation has sometimes produced ...
  • Heterotrophic respiration in disturbed forests : a review with examples from North America 

    Harmon, Mark E.; Bond-Lamberty, Ben; Tang, Jianwu; Vargas, Rodrigo (American Geophysical Union, 2011-05-14)
    Heterotrophic respiration (RH) is a major process releasing carbon to the atmosphere and is essential to understanding carbon dynamics in terrestrial ecosystems. Here we review what is known about this flux as related to ...
  • High particle export over the continental shelf of the west Antarctic Peninsula 

    Buesseler, Ken O.; McDonnell, Andrew M. P.; Schofield, Oscar M. E.; Steinberg, Deborah K.; Ducklow, Hugh W. (American Geophysical Union, 2010-11-24)
    Drifting cylindrical traps and the flux proxy 234Th indicate more than an order of magnitude higher sinking fluxes of particulate carbon and 234Th in January 2009 than measured by a time-series conical trap used regularly ...
  • Historical and idealized climate model experiments : an intercomparison of Earth system models of intermediate complexity 

    Eby, Michael; Weaver, Andrew J.; Alexander, K.; Zickfeld, K.; Abe-Ouchi, A.; Cimatoribus, A. A.; Crespin, E.; Drijfhout, S. S.; Edwards, N. R.; Eliseev, A. V.; Feulner, G.; Fichefet, T.; Forest, C. E.; Goosse, H.; Holden, P. B.; Joos, Fortunat; Kawamiya, M.; Kicklighter, David W.; Kienert, H.; Matsumoto, K.; Mokhov, I. I.; Monier, Erwan; Olsen, S. M.; Pedersen, J. O. P.; Perrette, M.; Philippon-Berthier, G.; Ridgwell, Andy; Schlosser, A.; Schneider von Deimling, T.; Shaffer, G.; Smith, R. S.; Spahni, R.; Sokolov, Andrei P.; Steinacher, M.; Tachiiri, K.; Tokos, K.; Yoshimori, M.; Zeng, Ning; Zhao, F. (Copernicus Publications on behalf of the European Geosciences Union, 2013-05-16)
    Both historical and idealized climate model experiments are performed with a variety of Earth system models of intermediate complexity (EMICs) as part of a community contribution to the Intergovernmental Panel on Climate ...
  • Historical carbon emissions and uptake from the agricultural frontier of the Brazilian Amazon 

    Galford, Gillian L.; Melillo, Jerry M.; Kicklighter, David W.; Mustard, John F.; Cronin, Timothy W.; Cerri, Carlos E. P.; Cerri, Carlos C. (Ecological Society of America, 2011-04)
    Tropical ecosystems play a large and complex role in the global carbon cycle. Clearing of natural ecosystems for agriculture leads to large pulses of CO2 to the atmosphere from terrestrial biomass. Concurrently, the remaining ...
  • Home site advantage in two long-lived arctic plant species : results from two 30-year reciprocal transplant studies 

    Bennington, Cynthia C.; Fetcher, Ned; Vavrek, Milan C.; Shaver, Gaius R.; Cummings, Kelli J.; McGraw, James B. (2012-03-30)
    Reciprocal transplant experiments designed to quantify genetic and environmental effects on phenotype are powerful tools for the study of local adaptation. For long-lived species, especially those in habitats with short ...
  • Impacts of extreme winter warming events on litter decomposition in a sub-Arctic heathland 

    Bokhorst, Stef; Bjerke, Jarle W.; Melillo, Jerry M.; Callaghan, Terry V.; Phoenix, Gareth K. (2009-12-17)
    Arctic climate change is expected to lead to a greater frequency of extreme winter warming events. During these events, temperatures rapidly increase to well above 0ºC for a number of days, which can lead to snow melt ...