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  • autotrophic activity  (1)
  • flushing half-life  (1)
  • heterotrophic activity  (1)
Document type
Keywords
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Years
  • 1
    Electronic Resource
    Electronic Resource
    Trophic state and water turn-over time in six choked coastal lagoons in Brazil (1991)
    Springer
    Biogeochemistry 14 (1991), S. 149-166 
    Details
    ISSN: 1573-515X
    Keywords: chlorophyll-a ; flushing half-life ; nutrients ; phosphorus loading ; trophic state ; water turn-over time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Comparison of total phosphorus and chlorophyll-a concentration, nutrient loading, and water turn-over time in six shallow choked lagoons along the coast of the state of Rio de Janeiro, Brazil, established that water turn-over time is related to the trophic state of the lagoons with additional anthropogenic nutrient loading affecting this relationship. Turnover time was calculated as a flushing half-life from rainfall, evaporation, runoff, and tidal exchange data, and trophic state was calculated from the quantity and quality of dissolved inorganic nutrients, total phosphorus, and chlorophyll-a standing stock. Flushing half-life of the lagoons ranged between 1 and 27 days, annual phosphorus areal loading from 3 to 18 mg m−2d−1, and chlorophyll-a standing stock from 6 to 160 mg M−2
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002903
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Benthic influence on the metabolism of a shallow tropical lagoon (Lagoa da Barra, Brazil) (1998)
    Springer
    Hydrobiologia 373-374 (1998), S. 89-100 
    Details
    ISSN: 1573-5117
    Keywords: tropical lagoon ; autotrophic activity ; heterotrophic activity ; pelagic carbon metabolism ; benthic carbon metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pelagic and benthic carbon metabolism in the shallow tropical Barra Lagoon was studied weekly between 1990 and 1993, in periods characterized by temporary nitrogen limitation, fish kills and transitory colonization of the bottom by macro-algae. Diurnal and nocturnal metabolic rates were measured by monitoring changes in CO2 content in entire water columns (free water and waters incubated in plexiglass tubes with and without inclusion of sediment). Total community carbon metabolism exhibited a marked autotrophism and high short term changes, dampening seasonal trends. Autotrophism and heterotrophism of the lagoon were controlled by phytoplankton biomass variations. In the presence of sediment, diurnal net benthic production was 11 to 64% of total diurnal net production, and nocturnal net benthic mineralization was 21 to 52% of total nocturnal net mineralization. The imbrication between the pelagic and benthic organic carbon cycles regulated carbon metabolism of the total community. A severe temporary nitrogen limitation, a fish kill and a temporary shift in primary producers did not substantially change metabolic rates because appropriate shifts occurred from the pelagic carbon cycle to the benthic carbon cycle, and vice-versa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017048128271
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    Paper (German National Licenses)
    Fulltext
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