Marine Biology

, Volume 150, Issue 5, pp 893–903 | Cite as

Functional responses of copepod nauplii using a high efficiency gut fluorescence technique

Research Article

Abstract

To investigate copepod nauplii ingestion rates on phytoplankton, we have adapted the traditional gut fluorescence technique as it can be used with lower gut pigment concentrations. With the improved technique, laboratory experiments were performed to estimate functional responses for nauplii of Calanus helgolandicus and Centropages typicus. Nauplii were raised from eggs to copepodites and the experiments were performed with stages NIV-NV. Gut evacuation rates and ingestion rates were measured on Isochrysis galbana at different concentrations. Specific ingestion rates ranged between 0.038–0.244 μg C μg−1 nauplii C d−1 for C. typicus and 0.041–1.412 μg C μg−1 nauplii C d−1 for C. helgolandicus. Both species showed a type III functional response, reaching a saturation concentration at around 600 μgC l−1 for C. typicus and 800 μgC l−1 for C. helgolandicus.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Area de Ecologia, Departamento de Biologia de Organismos y SistemasUniversidad de OviedoOviedoSpain
  2. 2.Plymouth Marine LaboratoryPlymouth UK

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