Primary production of epipsammic algal communities in Lake Balaton (Hungary) |
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Authors: | Email author" target="_blank">Viktória?üvegesEmail author Lajos?V?r?s Judit?Padisák Attila?W?Kovács |
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Institution: | 1.Department of Limnology,University of Pannonia,Veszprém,Hungary;2.Balaton Limnological Research Institute of Hungarian Academy of Sciences,Tihany,Hungary |
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Abstract: | Benthic algal communities can play an important role in matter and energy flux of shallow lakes. Their contribution to total
primary production of lakes has been largely unexplored. The aim of this study was to estimate the primary production of the
epipsammic algal communities at different water depths in Lake Balaton (Hungary) with photosynthetic measurements performed
in laboratory. The photosynthesis of the benthic algae of different origin was studied at nine different irradiance levels,
in three replicates. The maximum photosynthetic rate (P
max) was always higher in samples from the shallow parts than those from the deeper regions of the lake. Along the west–east
longitudinal axis of the lake P
max decreased in the southern part and increased in the middle of the lake as a consequence of differences in the chlorophyll-a concentrations. Knowing P
max, I
k, global radiation and extinction coefficient, the primary production (mg C m−2 day−1) of the epipsammic algal community was calculated at different water depths. In the shallow regions at 0.5 and 1 m water
depth 75–95% and 60–85% of the production was attributable to the epipsammon. The percentage contribution of epipsammon was
at 2 m water depth 20–65%. In the deeper pelagic region (>3 m) more than 85% of the primary production originated from the
phytoplankton. |
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Keywords: | |
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