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Collos Y, Hadjadji I, Plisson B, et al. PHASED OSCILLATIONS IN CELL NUMBERS AND NITRATE IN BATCH CULTURES OF ALEXANDRIUM TAMARENSE (DINOPHYCEAE)(1). J Phycol. 2011;47(5):1057-62doi: 10.1111/j.1529-8817.2011.01031.x.
Collos, Y., Hadjadji, I., Plisson, B., Cecchi, P., Laabir, M., Bechemin, C., & Masseret, E. (2011). PHASED OSCILLATIONS IN CELL NUMBERS AND NITRATE IN BATCH CULTURES OF ALEXANDRIUM TAMARENSE (DINOPHYCEAE)(1). Journal of phycology, 47(5), 1057-62. https://doi.org/10.1111/j.1529-8817.2011.01031.x
Collos, Yves, et al. "PHASED OSCILLATIONS IN CELL NUMBERS AND NITRATE IN BATCH CULTURES OF ALEXANDRIUM TAMARENSE (DINOPHYCEAE)(1)." Journal of phycology vol. 47,5 (2011): 1057-62. doi: https://doi.org/10.1111/j.1529-8817.2011.01031.x
Collos Y, Hadjadji I, Plisson B, Cecchi P, Laabir M, Bechemin C, Masseret E. PHASED OSCILLATIONS IN CELL NUMBERS AND NITRATE IN BATCH CULTURES OF ALEXANDRIUM TAMARENSE (DINOPHYCEAE)(1). J Phycol. 2011 Oct;47(5):1057-62. doi: 10.1111/j.1529-8817.2011.01031.x. Epub 2011 Aug 09. PMID: 27020187.
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J Phycol. 2011 Oct;47(5):1057-62. doi: 10.1111/j.1529-8817.2011.01031.x. Epub 2011 Aug 09.

PHASED OSCILLATIONS IN CELL NUMBERS AND NITRATE IN BATCH CULTURES OF ALEXANDRIUM TAMARENSE (DINOPHYCEAE)(1).

Journal of phycology

Yves Collos, Imene Hadjadji, Benoit Plisson, Philippe Cecchi, Mohamed Laabir, Christian Bechemin, Estelle Masseret

Affiliations

  1. Université Montpellier 2, Ecologie des Systèmes Marins Côtiers, UMR 5119 CNRS, IRD, CC093, 34095 Montpellier Cedex 5, FranceIfremer, Laboratoire Environnement Ressources des Pertuis Charentais, BP 7 - 17137?L'Houmeau, FranceUniversité Montpellier 2, Ecologie des Systèmes Marins Côtiers, UMR 5119 CNRS, IRD, CC093, 34095 Montpellier Cedex 5, France.

PMID: 27020187 DOI: 10.1111/j.1529-8817.2011.01031.x

Abstract

Alexandrium tamarense (M. Lebour) Balech strains isolated in spring 2007 from a single bloom in Thau lagoon have been grown in nonaxenic artificial media. For three strains showing large oscillations in biomass (crashes followed by recoveries) on a scale of several days, a significant relationship was observed between changes in cell densities (as in vivo fluorescence) and changes in nitrate concentrations. Increases in cell densities were accompanied by decreases in nitrate, while decreases in cell densities corresponded to increases in nitrate, presumably due to nitrification. Net increases in nitrate could reach up to 15 μmol N · L(-1)  · d(-1) indicating a very active nitrifying archaeal/bacterial population. However, following population crashes, algal cells can recover and attain biomass levels similar to those reached during the first growth phase. This finding indicates that those archaea/bacteria do not compete for nutrients or do not hamper algal growth under those conditions. In contrast to diatoms, dinoflagellates such as A. tamarense do not excrete/exude dissolved organic matter, thus preventing excessive bacterial growth. This mechanism could help explain the recovery of this species in the presence of bacteria.

© 2011 Phycological Society of America.

Keywords: Alexandrium tamarense; archaea; bacteria; decay; growth; nitrate; nitrification; oscillations

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