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Feeding rates and productivity of the copepod Acartia bifilosa in a highly turbid estuary; the Gironde (SW France)
Irigoien, X.; Castel, J. (1995). Feeding rates and productivity of the copepod Acartia bifilosa in a highly turbid estuary; the Gironde (SW France). Hydrobiologia 311(1-3): 115-125. https://dx.doi.org/10.1007/BF00008575
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158; e-ISSN 1573-5117, more
Related to:
Irigoien, X.; Castel, J. (1995). Feeding rates and productivity of the copepod Acartia bifilosa in a highly turbid estuary; the Gironde (SW France), in: Heip, C.H.R. et al. Major biological processes in European tidal estuaries. Developments in Hydrobiology, 110: pp. 115-125, more
Peer reviewed article  
Keywords
    Aquatic communities > Plankton > Phytoplankton
    Aquatic communities > Plankton > Zooplankton
    Behaviour > Feeding behaviour
    Behaviour > Feeding behaviour > Grazing
    Biological production
    Fluorimeters
    Organic compounds > Carbohydrates > Glycosides > Pigments > Photosynthetic pigments > Chlorophylls
    Properties > Physical properties > Turbidity
    Acartia bifilosa (Giesbrecht, 1881) [WoRMS]; Acartia tonsa Dana, 1849-1852 [WoRMS]
    ANE, France, Gironde Estuary [Marine Regions]
    Marine/Coastal; Brackish water
Authors  Top 
  • Irigoien, X.
  • Castel, J.
Abstract
    Acartia spp. are the dominant copepod species in the Gironde estuary, seaward of the turbidity maximum area. Acartia bifilosa develop a large population in spring and early summer whereas Acartia tonsa appear in late summer. High values and high variability of chlorophyll a/suspended particulate matter ratio are found seaward of the turbidity maximum area. Feeding rates of A. bifilosa were measured by fluorometry. Phytoplankton ingestion was found to be highly variable, between 8 to 80% of copepod carbon body weight. Except for adult females, copepods were heavier in summer than in winter. PB ratios, estimated by the instantaneous growth rate method, varied from 0.03 d–1 to 0.14 d–1. The gut contents and P/B ratios of Acartia bifilosa were related to chl a/SPM ratio. From those data, and a few obtained for A. tonsa, it is concluded that only in summer months phytoplankton ingestion is enough to maintain secondary production.
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