Le Borgne, R. and Dufour, P. (1979) Premiers résultats sur l'excrétion et la production du zooplancton de la Lagune Ebrié (Côte d'Ivoire). Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan, 10(1), pp. 1-39.
Biomass and metabolic rates (total nitrogen and phosphorus excretion and respiration) were measured at 4 stations, representative of the lagoon environment, during high-water (Oct-Nov), dry (Dec-Jan) and rainy (July) seasons. In low-salinity waters (4o/oo) Acartia clausi is almost the only species, whereas a marine and diversified fauna is brought in from the ocean during the dry season. O/NT and O/PT atomic ratios between respiration (O) and total nitrogen (NT) and phosphorus (PT) excretions are high (15.1 and 111, respectively) and show a marked hydrocarbon feeding of zooplankton. Production was assessed from excretion via the net growth efficiency coefficient, K2 , calculated from N/P ratios for particles (a1), zooplankton excretion (a2) and constitution (a3). Daily productivity indices (i.e. daily production/biomass ratio) are high and equivalent to 1.2-3.8 day turn-over times. These high values may be ascribed to high temperatures (26.5-30 C) and phytoplankton richness (surface chlorophyll 'a' concentrations are always greater than 4 mg/m-3). Finally, the paper deals with trophic relationships between phyto- and zooplankton (ingestion /primary production ratio and transfer coefficient) and the question of relationships between zooplankton and predators.
|Item Type: ||Article|
|Title: ||Premiers résultats sur l'excrétion et la production du zooplancton de la Lagune Ebrié (Côte d'Ivoire)|
|Personal Creator/Author: |
|Le Borgne, R.|
|Journal or Publication Title: ||Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan|
|Page Range: ||pp. 1-39|
|Date: ||June 1979|
|Issuing Agency: ||Centre de Recherches Océanographiques, Côte d'Ivoire|
|Uncontrolled Keywords: ||Côte d'Ivoire; Lagune Ebrié; biomass; zooplankton; Acartia clausi|
|Item ID: ||8028|
|Depositing User: ||Mr Luigi Baldassari|
|Date Deposited: ||09 Mar 2012 10:07|
|Last Modified: ||09 Mar 2012 10:07|
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