Now showing items 1048-1067 of 8601

    • The Cleft revealed: geologic, magnetic, and morphologic evidence for construction of upper oceanic crust along the southern Juan de Fuca Ridge 

      Stakes, Debra S.; Perfit, Michael R.; Tivey, Maurice A.; Caress, David W.; Ramirez, Tony M.; Maher, Norman (American Geophysical Union, 2006-04-12)
      The geology and structure of the Cleft Segment of the Southern Juan de Fuca Ridge (JdFR) have been examined using high-resolution mapping systems, observations by remotely operated vehicle (ROV), ROV-mounted magnetometer, ...
    • Clicking for calamari : toothed whales can echolocate squid Loligo pealeii 

      Madsen, Peter T.; Wilson, M.; Johnson, Mark P.; Hanlon, Roger T.; Bocconcelli, Alessandro; Aguilar De Soto, Natacha; Tyack, Peter L. (Inter-Research, 2007-11-27)
      Squid play an important role in biomass turnover in marine ecosystems and constitute a food source for ~90% of all echolocating toothed whale species. Nonetheless, it has been hypothesized that the soft bodies of squid ...
    • Clicking in shallow rivers : short-range echolocation of Irrawaddy and Ganges River dolphins in a shallow, acoustically complex habitat 

      Jensen, Frants H.; Rocco, Alice; Mansur, Rubaiyat M.; Smith, Brian D.; Janik, Vincent M.; Madsen, Peter T. (Public Library of Science, 2013-04-03)
      Toothed whales (Cetacea, odontoceti) use biosonar to navigate their environment and to find and catch prey. All studied toothed whale species have evolved highly directional, high-amplitude ultrasonic clicks suited for ...
    • Climate and species affect fine root production with long-term fertilization in acidic tussock tundra near Toolik Lake, Alaska 

      Sullivan, Patrick F.; Sommerkorn, Martin; Rueth, Heather M.; Nadelhoffer, Knute J.; Shaver, Gaius R.; Welker, Jeffrey M. (2007-04-12)
      Long-term fertilization of acidic tussock tundra has led to changes in plant species composition, increases in aboveground production and biomass and substantial losses of soil organic carbon (SOC). Root litter is an ...
    • Climate change as an intergenerational problem 

      Wunsch, Carl; Schmitt, Raymond W.; Baker, D. James (2012-11)
      Predicting climate change is a high priority for society, but such forecasts are notoriously uncertain. Why? Even should climate prove theoretically predictable---by no means certain---the near-absence of adequate ...
    • A Climate Change Atlas for the Ocean 

      Boyd, Philip W.; Law, Cliff S.; Doney, Scott C. (Oceanography Society, 2011-06)
      At both regional and national levels, there is an urgent need to develop a clear picture of how climate change will alter multiple environmental properties in the ocean. Specifically, what will such cumulative alterations ...
    • Climate change decreases nitrogen pools and mineralization rates in northern hardwood forests 

      Durán, Jorge; Morse, Jennifer L.; Groffman, Peter M.; Campbell, John L.; Christenson, Lynn M.; Driscoll, Charles T.; Fahey, Timothy J.; Fisk, Melany C.; Likens, Gene E.; Melillo, Jerry M.; Mitchell, Myron J.; Templer, Pamela H.; Vadeboncoeur, Matthew A. (John Wiley & Sons, 2016-03-22)
      Nitrogen (N) supply often limits the productivity of temperate forests and is regulated by a complex mix of biological and climatic drivers. In excess, N is linked to a variety of soil, water, and air pollution issues. ...
    • Climate change threatens polar bear populations : a stochastic demographic analysis 

      Hunter, Christine M.; Caswell, Hal; Runge, Michael C.; Regehr, Eric V.; Amstrup, Steve C.; Stirling, Ian (Ecological Society of America, 2010-10)
      The polar bear (Ursus maritimus) depends on sea ice for feeding, breeding, and movement. Significant reductions in Arctic sea ice are forecast to continue because of climate warming. We evaluated the impacts of climate ...
    • Climate change, precipitation and impacts on an estuarine refuge from disease 

      Levinton, Jeffrey; Doall, Michael; Ralston, David K.; Starke, Adam; Allam, Bassem (Public Library of Science, 2011-04-28)
      Oysters play important roles in estuarine ecosystems but have suffered recently due to overfishing, pollution, and habitat loss. A tradeoff between growth rate and disease prevalence as a function of salinity makes the ...
    • Climate controls on coral growth in the Caribbean 

      Bosshart, Sara A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2013-02)
      Accurate predictions of Caribbean carol reef responses to global climate change are currently limited by a lack of knowledge of the dominant environmental controls on coral growth. Corals exhibit significant responses to ...
    • Climate forcing for dynamics of dissolved inorganic nutrients at Palmer Station, Antarctica : an interdecadal (1993–2013) analysis 

      Kim, Hyewon; Doney, Scott C.; Iannuzzi, Richard A.; Meredith, Michael P.; Martinson, Douglas G.; Ducklow, Hugh W. (John Wiley & Sons, 2016-09-17)
      We analyzed 20 years (1993–2013) of observations of dissolved inorganic macronutrients (nitrate, N; phosphate, P; and silicate, Si) and chlorophyll a (Chl) at Palmer Station, Antarctica (64.8°S, 64.1°W) to elucidate how ...
    • Climate forcing of unprecedented intense-hurricane activity in the last 2000 years 

      Donnelly, Jeffrey P.; Hawkes, Andrea D.; Lane, D. Philip; MacDonald, Dana; Shuman, Bryan N.; Toomey, Michael R.; van Hengstum, Peter J.; Woodruff, Jonathan D. (John Wiley & Sons, 2015-02-23)
      How climate controls hurricane variability has critical implications for society is not well understood. In part, our understanding is hampered by the short and incomplete observational hurricane record. Here we present a ...
    • Climate impacts of a large-scale biofuels expansion 

      Hallgren, Willow; Schlosser, C. Adam; Monier, Erwan; Kicklighter, David W.; Sokolov, Andrei P.; Melillo, Jerry M. (John Wiley & Sons, 2013-04-28)
      A global biofuels program will potentially lead to intense pressures on land supply and cause widespread transformations in land use. These transformations can alter the Earth climate system by increasing greenhouse gas ...
    • Climate impacts on zooplankton population dynamics in coastal marine ecosystems 

      Batchelder, Harold P.; Daly, Kendra L.; Davis, Cabell S.; Ji, Rubao; Ohman, Mark D.; Peterson, William T.; Runge, Jeffrey A. (The Oceanography Society, 2013-12)
      The 20-year US GLOBEC (Global Ocean Ecosystem Dynamics) program examined zooplankton populations and their predators in four coastal marine ecosystems. Program scientists learned that environmental controls on zooplankton ...
    • Climate modulates internal wave activity in the Northern South China Sea 

      DeCarlo, Thomas M.; Karnauskas, Kristopher B.; Davis, Kristen A.; Wong, George T. F. (John Wiley & Sons, 2015-02-10)
      Internal waves (IWs) generated in the Luzon Strait propagate into the Northern South China Sea (NSCS), enhancing biological productivity and affecting coral reefs by modulating nutrient concentrations and temperature. Here ...
    • Climate related sea-level variations over the past two millennia 

      Kemp, Andrew C.; Horton, Benjamin P.; Donnelly, Jeffrey P.; Mann, Michael E.; Vermeer, Martin; Rahmstorf, Stefan (2011-03)
      We present new sea-level reconstructions for the past 2100 years based on salt-marsh sedimentary sequences from the US Atlantic coast. The data from North Carolina reveal four phases of persistent sea-level change after ...
    • Climate variability in the equatorial Pacific Ocean induced by decadal variability of mixing coefficient 

      Huang, Chuan Jiang; Wang, Wei; Huang, Rui Xin (American Meteorological Society, 2007-05)
      The circulation in the equatorial Pacific Ocean is studied in a series of numerical experiments based on an isopycnal coordinate model. The model is subject to monthly mean climatology of wind stress and surface thermohaline ...
    • Climate variability of southern Chile since the Last Glacial Maximum : a continuous sedimentological record from Lago Puyehue (40°S) 

      Bertrand, Sebastien; Charlet, Francois; Charlier, Bernard; Renson, Virginie; Fagel, Nathalie (2007-04-29)
      This paper presents a multi-proxy climate record of an 11 m long core collected in Lago Puyehue (southern Chile, 40°S) and extending back to 18,000 cal yr BP. The multi-proxy analyses include sedimentology, mineralogy, ...
    • Climate variability, oceanography, bowhead whale distribution, and Iñupiat subsistence whaling near Barrow, Alaska 

      Ashjian, Carin J.; Braund, Stephen R.; Campbell, Robert G.; George, John C.; Kruse, Jack; Maslowski, Wieslaw; Moore, Sue E.; Nicolson, Craig R.; Okkonen, Stephen R.; Sherr, Barry F.; Sherr, Evelyn B.; Spitz, Yvette H. (Arctic Institute of North America, 2010-06)
      The annual migration of bowhead whales (Balaena mysticetus) past Barrow, Alaska, has provided subsistence hunting to Iñupiat for centuries. Bowheads recurrently feed on aggregations of zooplankton prey near Barrow in autumn. ...
    • Climate-driven range extension of Amphistegina (protista, foraminiferida) : models of current and predicted future ranges 

      Langer, Martin R.; Weinmann, Anna E.; Lotters, Stefan; Bernhard, Joan M.; Rodder, Dennis (Public Library of Science, 2013-02-06)
      Species-range expansions are a predicted and realized consequence of global climate change. Climate warming and the poleward widening of the tropical belt have induced range shifts in a variety of marine and terrestrial ...