Feeding rates and productivity of the copepod Acartia bifilosa in a highly turbid estuary; the Gironde (SW France)

Xabier Irigoyen*, Jacques Castel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)115-125
Number of pages11
JournalHydrobiologia
Volume311
Issue number1-3
DOIs
StatePublished - Jan 1 1995

Keywords

  • Acartia bifilosa
  • Acartia tonsa
  • feeding
  • productivity
  • suspended particulate matter

ASJC Scopus subject areas

  • Aquatic Science

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