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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
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • 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. (Ed.) Major biological processes in European tidal estuaries. Developments in Hydrobiology, 110: pp. 115-125, more

Available in Authors 

Keywords
    Biological production; Chlorophylls; Feeding behaviour; Fluorimeters; Grazing; Phytoplankton; Turbidity; Zooplankton; Acartia bifilosa (Giesbrecht, 1881) [WoRMS]; Acartia tonsa Dana, 1849 [WoRMS]; ANE, France, Gironde Estuary [Marine Regions]; Marine; 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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