Now showing items 116-135 of 265

  • Lability of DOC transported by Alaskan rivers to the Arctic Ocean 

    Holmes, Robert M.; McClelland, James W.; Raymond, Peter A.; Frazer, Breton B.; Peterson, Bruce J.; Stieglitz, Marc (American Geophysical Union, 2008-02-09)
    Arctic rivers transport huge quantities of dissolved organic carbon (DOC) to the Arctic Ocean. The prevailing paradigm is that DOC in arctic rivers is refractory and therefore of little significance for the biogeochemistry ...
  • Land carbon sequestration within the conterminous United States : regional- and state-level analyses 

    Lu, Xiaoliang; Kicklighter, David W.; Melillo, Jerry M.; Reilly, John M.; Xu, Liyi (John Wiley & Sons, 2015-02-28)
    A quantitative understanding of the rate at which land ecosystems are sequestering or losing carbon at national-, regional-, and state-level scales is needed to develop policies to mitigate climate change. In this study, ...
  • A land-to-ocean perspective on the magnitude, source and implication of DIC flux from major Arctic rivers to the Arctic Ocean 

    Tank, Suzanne E.; Raymond, Peter A.; Striegl, Robert G.; McClelland, James W.; Holmes, Robert M.; Fiske, Gregory J.; Peterson, Bruce J. (American Geophysical Union, 2012-12-14)
    A series of seasonally distributed measurements from the six largest Arctic rivers (the Ob', Yenisey, Lena, Kolyma, Yukon and Mackenzie) was used to examine the magnitude and significance of Arctic riverine DIC flux to ...
  • Landscape heterogeneity and the biodiversity of Arctic stream communities : a habitat template analysis 

    Huryn, Alexander D.; Slavik, Karie A.; Lowe, Rex L.; Parker, Stephanie M.; Anderson, Dennis S.; Peterson, Bruce J. (National Research Council Canada, 2005-08-27)
    We predicted that substratum freezing and instability are major determinants of the variability of stream community structure in Arctic Alaska. Their effects were conceptualized as a two-dimensional habitat template that ...
  • Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal 

    Tank, Suzanne E.; Frey, Karen E.; Striegl, Robert G.; Raymond, Peter A.; Holmes, Robert M.; McClelland, James W.; Peterson, Bruce J. (American Geophysical Union, 2012-08-21)
    While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3−) flux represents a CO2 sink, as a result of weathering processes ...
  • Limnology of tundra ponds, Barrow, Alaska 

    Hobbie, John E. (Dowden, Hutchinson & Ross, 1980)
    This book is a report of investigations of several small ponds on the arctic tundra near Barrow, Alaska. The main study, which ran from 1971 through 1973, was funded from three sources: The National Science Foundation, ...
  • Linkages among runoff, dissolved organic carbon, and the stable oxygen isotope composition of seawater and other water mass indicators in the Arctic Ocean 

    Cooper, Lee W.; Benner, Ronald; McClelland, James W.; Peterson, Bruce J.; Holmes, Robert M.; Raymond, Peter A.; Hansell, Dennis A.; Grebmeier, Jacqueline M.; Codispoti, Louis A. (American Geophysical Union, 2005-12-07)
    Concentrations of dissolved organic carbon (DOC) and δ18O values have been determined following sampling of runoff from a number of major arctic rivers, including the Ob, Yenisey, Lena, Kolyma, Mackenzie and Yukon in ...
  • Linking ecology and economics for ecosystem management 

    Farber, Stephen; Costanza, Robert; Childers, Daniel L.; Erickson, Jon; Gross, Katherine; Grove, J. Morgan; Hopkinson, Charles S.; Kahn, James; Pincetl, Stephanie; Troy, Austin; Warren, Paige; Wilson, Matthew (American Institute of Biological Sciences, 2006-02)
    This article outlines an approach, based on ecosystem services, for assessing the trade-offs inherent in managing humans embedded in ecological systems. Evaluating these trade-offs requires an understanding of the biophysical ...
  • Long-term biological effects of petroleum residues on fiddler crabs in salt marshes 

    Culbertson, Jennifer B.; Valiela, Ivan; Peacock, Emily E.; Reddy, Christopher M.; Carter, Anna; VanderKruik, Rachel (2007)
    In September 1969,the Florida barge spilled 700,000 L of No. 2 fuel oil into the salt marsh sediments of Wild Harbor (Buzzards Bay, MA). Today the aboveground environment appears unaffected, but a substantial amount of ...
  • Long-term CO2 enrichment of a forest ecosystem : implications for forest regeneration and succession 

    Mohan, Jacqueline E.; Clark, James S.; Schlesinger, William H. (Ecological Society of America, 2007-06)
    The composition and successional status of a forest affect carbon storage and net ecosystem productivity, yet it remains unclear whether elevated atmospheric carbon dioxide (CO2) will impact rates and trajectories of forest ...
  • Long-term ecological research in a human-dominated world 

    Robertson, G. Philip; Collins, Scott L.; Foster, David R.; Brokaw, Nicholas; Ducklow, Hugh W.; Gragson, Ted L.; Gries, Corinna; Hamilton, Stephen K.; McGuire, A. David; Moore, John C.; Stanley, Emily H.; Waide, Robert B.; Williams, Mark W. (American Institute of Biological Sciences, 2012-04)
    The US Long Term Ecological Research (LTER) Network enters its fourth decade with a distinguished record of achievement in ecological science. The value of long-term observations and experiments has never been more important ...
  • Long-term experimental warming and nutrient additions increase productivity in tall deciduous shrub tundra 

    DeMarco, Jennie; Mack, Michelle C.; Bret-Harte, M. Syndonia; Burton, Mark; Shaver, Gaius R. (Ecological Society of America, 2014-06-19)
    Warming Arctic temperatures can drive changes in vegetation structure and function directly by stimulating plant growth or indirectly by stimulating microbial decomposition of organic matter and releasing more nutrients ...
  • Long-term forest soil warming alters microbial communities in temperate forest soils 

    DeAngelis, Kristen M.; Pold, Grace; Topcuoglu, Begum D.; van Diepen, Linda T. A.; Varney, Rebecca M.; Blanchard, Jeffrey L.; Melillo, Jerry M.; Frey, Serita D. (Frontiers Media, 2015-02-13)
    Soil microbes are major drivers of soil carbon cycling, yet we lack an understanding of how climate warming will affect microbial communities. Three ongoing field studies at the Harvard Forest Long-term Ecological Research ...
  • Long-term studies of the marine ecosystem along the west Antarctic Peninsula 

    Ducklow, Hugh W. (2008-06-27)
    Articles in this volume focus on longer-term studies of the marine ecosystem of the continental shelf west of the Antarctic Peninsula, principally by the Palmer, Antarctica Long- Term Ecological Research project (Ross ...
  • Long-term survival of adult Arctic grayling (Thymallus arcticus) in the Kuparuk River, Alaska 

    Buzby, Karen M.; Deegan, Linda A. (National Research Council Canada, 2004-12-23)
    In many long-lived species such as Arctic grayling (Thymallus arcticus), population growth rate is most sensitive to changes in adult survival probabilities. Understanding the factors that regulate adult survival in this ...
  • Looking deeper into the soil : biophysical controls and seasonal lags of soil CO2 production and efflux 

    Vargas, Rodrigo; Baldocchi, Dennis D.; Allen, Michael F.; Bahn, Michael; Black, T. Andrew; Collins, Scott L.; Yuste, Jorge Curiel; Hirano, Takashi; Jassal, Rachhpal S.; Pumpanen, Jukka; Tang, Jianwu (Ecological Society of America, 2010-09)
    We seek to understand how biophysical factors such as soil temperature (Ts), soil moisture (θ), and gross primary production (GPP) influence CO2 fluxes across terrestrial ecosystems. Recent advancements in automated ...
  • Macroalgal responses to experimental nutrient enrichment in shallow coastal waters : growth, internal nutrient pools, and isotopic signatures 

    Teichberg, Mirta; Fox, Sophia E.; Aguila, Carolina; Olsen, Ylva S.; Valiela, Ivan (Inter-Research, 2008-09-25)
    Increased nutrient inputs to temperate coastal waters have led to increased occurrences of macroalgal blooms worldwide. To identify nutrients that are limiting to macroalgae and to determine whether different forms of these ...
  • Macrophyte abundance in Waquoit Bay : effects of land-derived nitrogen loads on seasonal and multi-year biomass patterns 

    Fox, Sophia E.; Stieve, Erica; Valiela, Ivan; Hauxwell, Jennifer; McClelland, James W. (2008-01)
    Anthropogenic inputs of nutrients to coastal waters have rapidly restructured coastal ecosystems. To examine the response of macrophyte communities to land-derived nitrogen loading, we measured macrophyte biomass monthly ...
  • Mechanical land clearing to promote establishment of coastal sandplain grassland and shrubland communities 

    Lezberg, Ann L.; Buresch, Kendra C.; Neill, Christopher; Chase, Tom (2005-07-22)
    The decline in grasslands and other species-rich early-successional habitats on the coastal sandplains of the northeastern U.S. has spurred management to increase the area of these declining plant communities. We mechanically ...
  • Meeting report : GBIF hackathon-workshop on Darwin Core and sample data (22-24 May 2013) 

    Wieczorek, John; Banki, Olaf; Blum, Stan D.; Deck, John; Doring, Markus; Droge, Gabriele; Endresen, Dag; Goldstein, Philip; Leary, Patrick R.; Krishtalka, Leonard; O'Tuama, Eamonn; Robbins, Robert J.; Robertson, Tim; Yilmaz, Pelin (Genomic Standards Consortium, 2014)
    The workshop-hackathon was convened by the Global Biodiversity Information Facility (GBIF) at its secretariat in Copenhagen over 22-24 May 2013 with additional support from several projects (RCN4GSC, EAGER, VertNet, BiSciCol, ...