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  • 1
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rates of microheterotrophic utilization (incorporation+respiration) of 3H-leucine and 3H-glutamic acid were measured in seawater surface films from oligotrophic, eutrophic and mesotrophic waters incubated in situ off Baja California in July 1981 and off Southern California in November 1982. Neither visible nor ultraviolet radiation had a marked detrimental effect on microbial heterotrophy, although solar radiation sometimes appeared to be stimulatory. Film microheterotrophs utilized glutamic acid at rates between 0.07 and 0.13 nM h-1 for oligotrophic waters and between 0.43 and 2.1 nM h-1 for eutrophic waters; the respective turnover times ranged between 101 and 313 h and between 8.6 and 21.5 h. Film microheterotrophs from oligotrophic waters utilized leucine at rates comparable to those observed for glutamic acid, but turnover times were shorter. Leucine metabolism rates of film microheterotrophs in eutrophic waters were slower than glutamic acid rates, but turnover times were similar. Naturally varying amino acid concentrations accounted, in part, for differences in turnover times. In oligotrophic waters, higher utilization rates were observed for surface-film microheterotrophs than for subsurface (10 cm) microheterotrophs, whereas in eutrophic waters, utilization rates were similar for surface-film microheterotrophs and subsurface microheterotrophs. Surface-film microheterotrophs, in most cases, had an average of 63% amino acid carbon assimilation efficiency, similar to euphotic-zone heterotrophs. Surface-film microheterotrophs are actively involved in the metabolism and turnover of amino acids.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2022-05-25
    Description: CoOP (Coastal Ocean Processes) is an organization meant to study major interdisciplinary scientific problems in the coastal ocean. Its goal is "to obtain a new level of quantitative understanding of the processes that dominate the transformations, transport and fates of biologically, chemically and geologically important matter on the continental margin". Central to obtaining this understanding will be advances in observing and modeling the cross-shelf component of transport. More specific objectives are to understand 1) cross-margin exchanges, 2) air sea exchanges, 3) benthic-pelagic exchanges, 4) terrestrial inputs and 5) biological and chemical transformations within the water column. CoOP research will be carried out primarly through a series of process-oriented field studies, each involving about two years of measurements. Each of these field studies is to be initiated and defined through a community workshop. In addition to the process studies, CoOP will also involve modeling, long time series, exploratory studies, remote sensing, technological innovation, data archiving and communications. A CoOP pilot study has been approved for funding by the National Science Foundation, and funding will begin in 1992. The CoOP science effort is thus already underway.
    Description: Funding was provided by the National Science Foundation under Grant No. OCE-9108993.
    Keywords: Coastal oceanography ; Coastal meteorology ; Continental shelf
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Format: 9125740 bytes
    Format: application/pdf
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