Search results | Digital Commons of Moss Landing Marine Laboratories

Title: Biogeochemistry of hydrothermal vent mussel communities,
Description: Cited By (since 1996):64, Invertebrates, CODEN: DRORE, Continuous measurements of sulfide, silicate and temperature were made in situ from the submersible Alvin in the Rose Garden and New Vent hydrothermal fields of the Galapagos Spreading Center. Continuous measurements of temperature also were made for an 18 day period in the Rose Garden field. The results demonstrate several adaptations that appear to have contributed to the success of the vent mussel Bathymodiolus thermophilus in the Rose Garden. Dense clusters of B. thermophilus can disperse the hydrothermal fluids laterally for distances of several meters. This results in a large increase in the area of the redox transition zone, where both dissolved oxygen and hydrogen sulfide are available. As a result, the animal communities can grow to occupy areas that would not otherwise provide adequate reduced substrates. Measurements of the temperature demonstrate a distinct tidal periodicity. This periodicity will result in a large range of environmental conditions within the vent community. The mussel can tolerate these wide ranges in condition because of its ability to accept long periods of anoxia and to filter feed., ,
Author: Johnson, Childress, Beehler, Sakamoto
Date: 1994-01-01T00:00:00Z

Title: A massive phytoplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean
Description: The seeding of an expanse of surface waters in the equatorial Pacific Ocean with low concentrations of dissolved iron triggered a massive phytoplankton bloom which consumed large quantities of carbon dioxide and nitrate that these microscopic plants cannot fully utilize under natural conditions. These and other observations provide unequivocal support for the hypothesis that phytoplankton growth in this oceanic region is limited by iron bioavailability., Cited By (since 1996):930, Oceanography
Author: Coale, Johnson, Fitzwater, Gordon, Tanner, Chavez, Ferioli, Sakamoto, Rogers, Millero, Steinberg, Nightingale, Cooper, Cochlan, Landry, Constantinou, Rollwagen, Trasvina, Kudela
Date: 1996-01-01T00:00:00Z

Title: Testing the iron hypothesis in ecosystems of the equatorial Pacific Ocean,
Description: The idea that iron might limit phytoplankton growth in large regions of the ocean has been tested by enriching an area of 64 km 2 in the open equatorial Pacific Ocean with iron. This resulted in a doubling of plant biomass, a threefold increase in chlorophyll and a fourfold increase in plant production. Similar increases were found in a chlorophyll-rich plume down-stream of the Galapagos Islands, which was naturaly enriched in iron. These findings indicate that iron limitation can control rates of phytoplankton productivity and biomass in the ocean., Cited By (since 1996):749, Oceanography, CODEN: NATUA, ,
Author: Martin, Coale, Johnson, Fitzwater, Gordon, Tanner, Hunter, Elrod, Nowicki, Coley, Barber, Lindley, Watson, Van Scoy, Law, Liddicoat, Ling, Stanton, Stockel, Collins, Anderson, Bidigare, Ondrusek, Latasa, Millero, Lee, Yao, Zhang, Friederich, Sakamoto, Chavez, Buck, Kolber, Greene, Falkowski, Chisholm, Hoge, Swift, Yungel, Turner, Nightingale, Hatton, Liss, Tindale
Date: 1994-01-01T00:00:00Z

Title: Determination of copper complexation in seawater using flow injection analysis with chemiluminescence detection,
Description: Flow injection analysis with chemiluminescence detection (FIA-CL) via the reaction of copper with 1,10-phenanthroline was used for the determination of copper complexation in seawater. A detection limit of 0.1nM Cu in undiluted seawater without sample preconcentration was obtained. Copper speciation was assessed by titrating natural seawater ligands with added copper. This method was used to measure copper complexation throughout the water column in Monterey Bay, California. Two ligand classes were identified: a strong ligand (L1), ranging in concentration from 1.3 to 3.1nM, and a weaker ligand (L2), ranging from 9.4 to 25.6nM. The average conditional stability constant for the strong ligand was logK1' 13.1±0.4 and for the weaker ligand logK2' 9.4±0.6. These measurements are in good agreement with complexation studies previously performed using established methods. This technique may eventually be adapted for in situ complexation measurements that can be used to monitor natural spatial and temporal variations in copper complexation, as well as coastal ecosystem responses to urban and industrial change., Cited By (since 1996):33, CODEN: ACACA, ,
Author: Zamzow, Coale, Johnson, Sakamoto
Date: 1998-01-01T00:00:00Z

Title: Determination of copper in sea water using a flow-injection method with chemiluminescence detection,
Description: Dissolved copper can be rapidly determined in sea water by using a modification of a chemiluminescence method. The determination is based on the formation of a complex between copper and 1,10-phenanthroline and the subsequent emission of light during the oxidation of the complex by hydrogen peroxide. A flow-injection manifold was constructed which provides for the separation of copper from the sea water matrix with a column of immobilized 8-hydroxyquinoline. The column eluant was injected into a carrier stream, mixed with the reagents and delivered to a flow cell where emitted light was detected and used to quantify the amount of copper in the sample. The technique is noteworthy for its low detection limit (0.4 nM), the rapidity of sample processing (approximately 8 min sample -1), the small sample volumes required (approximately 4 ml), and the minimal precautions necessary for the prevention of sample contamination during shipboard processing., Cited By (since 1996):36, CODEN: ACACA, ,
Author: Coale, Johnson, Stout, Sakamoto
Date: 1992-01-01T00:00:00Z