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Seasonal variation in total and soluble tissue nitrogen of Pleurophycus gardneri (Phaeophyceae: Laminariales) in relation to environmental nitrate

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Abstract

Seasonal variations in tissue nitrogen (ethanol soluble nitrate and ninhydrin positive substances, as well as total nitrogen) of different thallus parts of Pleurophycus gardneri Setchell and Saunders were monitored simultaneously with ambient seawater nitrate from 1982 until 1984 in Bamfield, Vancouver Island, British Columbia, Canada. A trend of low, nearly zero levels in ambient nitrate typical for the area in late spring and early summer normally contrasts with average nitrate concentrations of 10 μmol NO3 - l-1 in late fall and winter. Total nitrogen content was greater in the perennial thallus parts, stipe and holdfast than in the annual blade and peaked in fall and early winter. The longitudinal thallus distribution of nitrate revealed a distinct and significant concentration of nitrate in the haptera reaching at maximum 8% nitrate-N of the internal total nitrogen. Internal nitrate concentration ranged from 20 to 5 000 times the ambient nitrate concentration in the midrib, and from 40 to 3 100 times in the wing, while the range was greatest with 400 to 14 000 times in the haptera. P. gardneri contained at most about 7 μmol NO3 - g fresh wt-1 in the blade, which corresponds to about 6% of total tissue nitrogen. Ninhydrin positive substances comprised the major portion of the soluble N pool in P. gardneri and showed a pronounced seasonality. Concentrations of ninhydrin positive substances ranged from 20 to 800 μg N g fresh wt-1 in the midrib and in the wing. In the stipe, ninhydrin positive substances varied from 180 to 2 200 μg N g fresh wt-1, and from 250 to 1 200 μg N g fresh wt-1 in the haptera. Evidence is given that (1) the perennial parts, stipe and haptera of P. gardneri contain the majority of nitrogen products independent of season and ontogenetic stage; (2) ninhydrin positive substances are the most abundant internal nitrogen constituents; (3) the low N values in the blade in summer suggest a nitrogen limited growth; and (4) nitrate may not be the predominant external nitrogen source.

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Author notes

  1. I. Germann & U. Hoeger

    Present address: Fakultät für Biologie, AG Müller, Universität Konstanz, D-7750, Konstanz 1, Federal Republic of Germany

Authors and Affiliations

  1. Bamfield Marine Station, VOR 1BO, Bamfield, British Columbia, Canada

    I. Germann & U. Hoeger

  2. Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, British Columbia, Canada

    L. D. Druehl

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  1. I. Germann
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  2. L. D. Druehl
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  3. U. Hoeger
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Communicated by O. Kinne, Oldendorf/Luhe

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Germann, I., Druehl, L.D. & Hoeger, U. Seasonal variation in total and soluble tissue nitrogen of Pleurophycus gardneri (Phaeophyceae: Laminariales) in relation to environmental nitrate. Mar. Biol. 96, 413–423 (1987). https://doi.org/10.1007/BF00412526

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