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Dynamics of chlorophyll and photosynthesis in natural phytoplankton associations - 2. Primary productivity, quantum yields and photosynthetic rates in small Northgerman lakes

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Meffert,  Maria-Elisabeth
Department Microbial Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Overbeck,  Hans-Jürgen
Department Microbial Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Meffert, M.-E., & Overbeck, H.-J. (1985). Dynamics of chlorophyll and photosynthesis in natural phytoplankton associations - 2. Primary productivity, quantum yields and photosynthetic rates in small Northgerman lakes. Archiv für Hydrobiologie, 104(3), 363-385.


Cite as: http://hdl.handle.net/21.11116/0000-0005-0BA0-A
Abstract
Photosynthetic characteristics of phytoplankton assemblages were investigated in situ at weekly intervalls throughout the year in both the Plußsee and the Edebergsee' from 1981 to 1984. Findings of the previous 20 years in the Plußsee are confirmed. Primary productivity is estimated at about 500 mg m-2 d-1 for the entire year, corresponding, as do chlorophyll concentration and extinction coefficient to data given for mesotrophic or moderately eutrophic lakes. The differing primary production of the two lakes is compared in relation to their morphometry. Maximum quantum yields are constant in the lightlimited range, varying between 0.01-0.08 moles C Einstein-1 absorbed, depending largely on the stage of algal growth. Three different algal assemblages had values of about 0.06 moles C Einstein-1 absorbed when measured during growth stages. The chlorophyll specific light attenuation (kc) for five algal populations ranged between 0.007-0.02 m² mg-1 chlorophyll-a. Other photosynthetic characteristics varied as follows: the initial slope of the light-saturating curve, αB, lay between 0.0025-0.015mg C (mg chl-a)-1 mE-1 m²; the onset of light saturation, Ik, between 49-320 μE m-2 s-1; the maximum photosynthetic capacity, Pmax, between 1-4mg C (mg chl-a)-1 h-1. The controlling action of global radiation is demonstrated by season- and latitudinal dependant shifts of both the light-proportional photosynthesis and Pmax. Data of Pmax suggest that values are often below 5 mg C or 15 mg 02 (mg chl-a)-1 h-1 in meso- and eutrophic waters between the 50th-74th latitude north, in the contrast to similar waters at lower latitudes.