Relationship Between Productivity and N2(C2H 2) Fixation in a Thalassia testudinum Community

N2(C2H 2) fixation and primary production were measured in communities of Thalassia testudinum at two sites in Bimini Harbor (Bahamas). Production was determined by uptake of [14C]NaHCO3, by leaf growth measurements, and by applying an empirical formula based on leaf dimensions. The last two methods...

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Veröffentlicht in:Limnology and oceanography 1979-01, Vol.24 (1), p.117-125
Hauptverfasser: Capone, Douglas G., Penhale, Polly A., Oremland, Ronald S., Taylor, Barrie F.
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Sprache:eng
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Zusammenfassung:N2(C2H 2) fixation and primary production were measured in communities of Thalassia testudinum at two sites in Bimini Harbor (Bahamas). Production was determined by uptake of [14C]NaHCO3, by leaf growth measurements, and by applying an empirical formula based on leaf dimensions. The last two methods gave similar results but the14C method gave higher values. Anaerobic sediment N2fixation supplied about 1/4 to 1/2 of the nitrogen demand for leaf production (by leaf growth method) and there was a significant correlation between N2fixation and CO2fixation rates when all components of the communities were considered (macrophyte, phyllosphere epiphytes, and detrital leaves). N2fixation is important to production in Thalassia communities and the plant and its leaf epiphytes may be distinct entities in terms of nitrogen and carbon metabolism.
ISSN:0024-3590
DOI:10.4319/lo.1979.24.1.0117