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Simultaneous nitrogen and silicate deficiency of a phytoplankton community in a coastal jet-front

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Abstract

The nutritional status of a phytoplankton community was investigated in a coastal jet-front located in the Gulf of St. Lawrence, Canada, in 1987. During the sampling period, the frontal community was mainly composed of the diatomsChaetoceros debilis, Skeletonema costatum, Thalassiosira gravida andC. pelagicus. As previously reported for the St. Lawrence, some frontal stations were depleted both in nitrate and silicate. At stations impoverished in nitrate, internal nitrate pool concentrations were low or undetectable, suggesting that cells had not, recently, been exposed to a nitrate flux which exceeded the nitrate assimilation rate. At these impoverished stations, however, ambient and intracellular concentrations of ammonium and urea were high, suggesting that the community was not nitrogen-deficient. The comparison between the ambient silicate concentrations and the silicate requirement (K s ) of the dominant diatoms suggests thatC. debilis andS. costatum were Si-deficient. This is further supported by the low silicate uptake rates and intracellular concentrations measured at the silicate impoverished stations. The silicate deficiency also resulted in a decrease in the seston and phytoplankton N:C ratios.

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Authors and Affiliations

  1. Department of Oceanography, University of British Columbia, V6T 1W5, Vancouver, British Columbia, Canada

    M. E. Levasseur & P. J. Harrison

  2. Institut Maurice-Lamontagne, Ministère des Pêches et des Océans, C.P. 1000, G5H 3Z4, Mont-Joli, Québec, Canada

    M. E. Levasseur & J. -C. Therriault

  3. Department of Marine Biology, University of Bergen, N-5065, Blomsterdalen, Norway

    B. R. Heimdal

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  1. M. E. Levasseur
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Communicated by R. O'Dor, Halifax

Please address all correspondence and requests for reprints to Dr Levasseur at his new address: Maurice Lamontagne Institute, 850 Route de la Mer, Mont-Joli, Québec G5H 3Z4, Canada

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Levasseur, M.E., Harrison, P.J., Heimdal, B.R. et al. Simultaneous nitrogen and silicate deficiency of a phytoplankton community in a coastal jet-front. Mar. Biol. 104, 329–338 (1990). https://doi.org/10.1007/BF01313275

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