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The relationship between phytoplankton growth rate and production with emphasis on respiration and excretion Sakshaug, E. (1993). The relationship between phytoplankton growth rate and production with emphasis on respiration and excretion. ICES Mar. Sci. Symp. 197: 63-68 In: ICES Marine Science Symposia. ICES/Reitzel: Copenhagen. ISSN 0906-060X

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Beschikbaar in	Auteur
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Trefwoorden

Algae Aquatic communities > Plankton > Phytoplankton Biological production > Primary production Characteristics > Productivity Chemical reactions > Photochemical reactions > Photosynthesis Computer applications Computer applications Environmental effects > Light effects Excretion Growth rate Laboratory culture Mathematics Measurement Modelling Musculoskeletal system > Anatomical structures > Skeleton > Endoskeleton > Bones > Vertebrae Population functions > Growth Production rate > Productivity Productivity Radiations > Electromagnetic radiation > Light Respiration Algae [Algen]; Cephalochordata [WoRMS]; Tunicata [WoRMS] Marien/Kust

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Auteur		Top
Sakshaug, E.

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Abstract

Rates of respiration and production of extracellular matter represent losses from phytoplankton, depend on the growth regime, and may become particularly high in stressed cells. They are also species-dependent to an extent that should be taken into consideration in models; species dependence in respiration rates to some extent may reflect differences in strategies for the uptake of nitrogen. In some species the mitochondrial respiration rate in the light is considerably higher than in the dark. For such species calculations on the basis of measurements of oxygen uptake in darkness may lead to underestimation of the gross phytosynthetic rate in terms of oxygen evolution and, conversely, underestimation of net carbon uptake on the basis of data for gross carbon uptake. Studies of laboratory cultures of three diatom species indicate that net particulate carbon uptake on average may be as low as similar to 50% of gross carbon uptake. This implies that the photosynthetic efficiency (alpha) and the maximum photosynthetic rate (Pm) for net particulate uptake should be that much lower than the corresponding values relevant for gross carbon uptake.

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