Now showing items 1767-1786 of 8742

    • A deep-branching clade of retrovirus-like retrotransposons in bdelloid rotifers 

      Gladyshev, Eugene A.; Meselson, Matthew; Arkhipova, Irina R. (2006-09-12)
      Rotifers of class Bdelloidea, a group of aquatic invertebrates in which males and meiosis have never been documented, are also unusual in their lack of multicopy LINE-like and gypsy-like retrotransposons, groups inhabiting ...
    • Deep-sea mining of seafloor massive sulfides 

      Hoagland, Porter; Beaulieu, Stace E.; Tivey, Maurice A.; Eggert, Roderick G.; German, Christopher R.; Glowka, Lyle; Lin, Jian (2009-10-28)
      The potential emergence of an ocean mining industry to exploit seafloor massive sulfides could present opportunities for oceanographic science to facilitate seafloor mineral development in ways that lessen environmental harms.
    • Deep-sea scleractinian coral age and depth distributions in the northwest Atlantic for the last 225,000 years 

      Robinson, Laura F.; Adkins, Jess F.; Scheirer, Daniel S.; Fernandez, Diego P.; Gagnon, Alexander C.; Waller, Rhian G. (University of Miami - Rosenstiel School of Marine and Atmospheric Science, 2007-11-01)
      Deep-sea corals have grown for over 200,000 yrs on the New England Seamounts in the northwest Atlantic, and this paper describes their distribution both with respect to depth and time. Many thousands of fossil scleractinian ...
    • Deep-sea sediment records of the Laschamp geomagnetic field excursion (∼41,000 calendar years before present) 

      Lund, Steve P.; Schwartz, Martha; Keigwin, Lloyd D.; Johnson, Thomas (American Geophysical Union, 2005-04-02)
      We have recovered two new high-resolution paleomagnetic records of the Laschamp Excursion (∼41,000 calendar years B.P.) from deep-sea sediments of the western North Atlantic Ocean. The records document that the Laschamp ...
    • Deep-tow magnetic anomaly study of the Pacific Jurassic Quiet Zone and implications for the geomagnetic polarity reversal timescale and geomagnetic field behavior 

      Tominaga, Masako; Sager, William W.; Tivey, Maurice A.; Lee, Sang-Mook (American Geophysical Union, 2008-07-26)
      The Jurassic Quiet Zone (JQZ) is a region of low-amplitude magnetic anomalies whose distinctive character may be related to geomagnetic field behavior. We collected deep-tow magnetic profiles in Pigafetta Basin (western ...
    • Deep-water chemosynthetic ecosystem research during the Census of Marine Life decade and beyond : a proposed deep-ocean road map 

      German, Christopher R.; Ramirez-Llodra, Eva; Baker, Maria C.; Tyler, Paul A.; ChEss Scientific Steering Committee (Public Library of Science, 2011-08-04)
      The ChEss project of the Census of Marine Life (2002–2010) helped foster internationally-coordinated studies worldwide focusing on exploration for, and characterization of new deep-sea chemosynthetic ecosystem sites. This ...
    • Deep-water flow over the Lomonosov Ridge in the Arctic Ocean 

      Timmermans, Mary-Louise; Winsor, Peter; Whitehead, John A. (American Meteorological Society, 2005-08)
      The Arctic Ocean likely impacts global climate through its effect on the rate of deep-water formation and the subsequent influence on global thermohaline circulation. Here, the renewal of the deep waters in the isolated ...
    • Deeply-towed underwater vehicle systems : a verified analytical procedure for creating parameterized dynamic models 

      Hover, Franz S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-08)
      The dynamics of deeply-towed cable/vehicle systems are governed by nonlinear partial differential equations and as a result, trajectory control is generally difficult using the available techniques. This work examines ...
    • Deepwater overflow through Luzon Strait 

      Qu, Tangdong; Girton, James B.; Whitehead, John A. (American Geophysical Union, 2006-01-10)
      This study examines water property distributions in the deep South China Sea and adjoining Pacific Ocean using all available hydrographic data. Our analysis reveals that below about 1500 m there is a persistent baroclinic ...
    • Defensive responses of cuttlefish to different teleost predators 

      Staudinger, Michelle D.; Buresch, Kendra C.; Mathger, Lydia M.; Fry, Charlie; McAnulty, Sarah; Ulmer, Kimberly M.; Hanlon, Roger T. (Marine Biological Laboratory, 2013-12-01)
      We evaluated cuttlefish (Sepia officinalis) responses to three teleost predators: bluefish (Pomatomus saltatrix), summer flounder (Paralichthys dentatus), and black seabass (Centropristis striata). We hypothesized that the ...
    • Defining DNA-based operational taxonomic units for microbial-eukaryote ecology 

      Caron, David A.; Countway, Peter D.; Savai, Pratik; Gast, Rebecca J.; Schnetzer, Astrid; Moorthi, Stefanie D.; Dennett, Mark R.; Moran, Dawn M.; Jones, Adriane C. (2009-06-19)
      DNA sequence information has been increasingly used in ecological research on microbial eukaryotes. Sequence-based approaches have included studies of the total diversity of selected ecosystems, the autecology of ...
    • Defining planktonic protist functional groups on mechanisms for energy and nutrient acquisition : incorporation of diverse mixotrophic strategies 

      Mitra, Aditee; Flynn, Kevin J.; Tillmann, Urban; Raven, John A.; Caron, David A.; Stoecker, Diane K.; Not, Fabrice; Hansen, Per J.; Hallegraeff, Gustaaf M.; Sanders, Robert W.; Wilken, Susanne; McManus, George; Johnson, Matthew D.; Pitta, Paraskevi; Våge, Selina; Berge, Terje; Calbet, Albert; Thingstad, Frede; Jeong, Hae Jin; Burkholder, JoAnn M.; Glibert, Patricia M.; Graneli, Edna; Lundgren, Veronica (Elsevier, 2016-01-03)
      Arranging organisms into functional groups aids ecological research by grouping organisms (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally ...
    • Defining the ecological and physiological traits of phytoplankton across marine ecosystems 

      Alexander, Harriet (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2016-02)
      Marine phytoplankton are central players in the global carbon cycle, responsible for nearly half of global primary production. The identification of the factors controlling phytoplankton ecology, physiology, and, ultimately, ...
    • Defining the spicity 

      Huang, Rui Xin (Sears Foundation for Marine Research, 2011-07-01)
      Spicity is defined as a thermodynamic variable whose isopleths are 'perpendicular“ to those of density in the (T, S) diagram. A new set of Matlab codes are defined based on the following criteria: First, the isopleths of ...
    • Defining the word “seamount” 

      Staudigel, Hubert; Koppers, Anthony A. P.; Lavelle, J. William; Pitcher, Tony J.; Shank, Timothy M. (Oceanography Society, 2010-03)
      The term seamount has been defined many times (e.g., Menard, 1964; Wessel, 2001; Schmidt and Schmincke, 2000; Pitcher et al., 2007; International Hydrographic Organization, 2008; Wessel et al., 2010) but there is no ...
    • Definitions and sharpness of the extratropical tropopause : a trace gas perspective 

      Pan, L. L.; Randel, W. J.; Gary, B. L.; Mahoney, M. J.; Hintsa, Eric J. (American Geophysical Union, 2004-12-04)
      Definitions of the extratropical tropopause are examined from the perspective of chemical composition. Fine-scale measurements of temperature, ozone, carbon monoxide, and water vapor from approximately 70 aircraft flights, ...
    • Deforestation of watersheds of Panama : nutrient retention and export to streams 

      Valiela, Ivan; Barth-Jensen, Coralie; Stone, Thomas A.; Crusius, John; Fox, Sophia E.; Bartholomew, Megan (Springer, 2013-03-19)
      A series of eight watersheds on the Pacific coast of Panama where conversion of mature lowland wet forest to pastures by artisanal burning provided watershed-scale experimental units with a wide range of forest cover (23, ...
    • Deformation and faulting of subduction overriding plate caused by a subducted seamount 

      Ding, Min; Lin, Jian (John Wiley & Sons, 2016-09-03)
      We conducted numerical experiments to simulate elastoplastic deformation of the overriding plate caused by a subducted seamount. Calculations revealed development of a distinct pair of fault-like shear zones, including a ...
    • Deglacial diatom productivity and surface ocean properties over the Bermuda Rise, northeast Sargasso Sea 

      Gil, Isabelle M.; Keigwin, Lloyd D.; Abrantes, Fatima G. (American Geophysical Union, 2009-12-12)
      Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions ...
    • The deglacial history of surface and intermediate water of the Bering Sea 

      Cook, Mea S.; Keigwin, Lloyd D.; Sancetta, Constance A. (2005-07-31)
      The lithology of deglacial sediments from the Bering Sea includes intervals of laminated or dysaerobic sediments. These intervals are contemporaneous with the occurrence of laminated sediments from the California margin ...