Diel periodicity in Synechococcus populations and grazing by heterotrophic nanoflagellates: Analysis of food vacuole contents - Physiologie, Interactions et Structures des Communautés
Article Dans Une Revue Limnology and Oceanography Année : 1999

Diel periodicity in Synechococcus populations and grazing by heterotrophic nanoflagellates: Analysis of food vacuole contents

K Simek
  • Fonction : Auteur

Résumé

The relationship between heterotrophic nanoflagellates (HFLAG) and the autotrophic prokaryote Synechococcus was examined in the bay of Villefranche (NW Mediterranean) in June 1998. We determined Synechococcus concentrations, % of dividing Synechococcus cells, concentrations of HFLAG, and numbers of Synechococcus cells inside HFLAG food vacuoles in samples taken every 2-3 h over 62 h (n = 28). Synechococcus cells in division ranged from 10 to 30%, with peak values in late afternoon-early evening hours. Numbers of Synechococcus in HFLAG food vacuoles (0.06-0.34 Synechococcus HFLAG(-1)) were not related to concentrations df total Synechococcus, or nondividing Synechococcus but were negatively related to % of dividing Synechococcus. The data suggest there may be a relationship between vulnerability to predation and average Synechococcus cell size. HFLAG community grazing pressure, estimated from food vacuole content and HFLAG abundances, ranged from about 0.2% Synechococcus stock removed h(-1) at midnight to 1% Synechococcus stock removed h(-1) at noon.

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Océanographie
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hal-03284900 , version 1 (26-09-2024)

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Jr Dolan, K Simek. Diel periodicity in Synechococcus populations and grazing by heterotrophic nanoflagellates: Analysis of food vacuole contents. Limnology and Oceanography, 1999, 44 (6), pp.1565-1570. ⟨10.4319/lo.1999.44.6.1565⟩. ⟨hal-03284900⟩
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