caa a22 4500 445890886 CHVBK 20180317145615.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10750-011-0647-y doi (NATIONALLICENCE)springer-10.1007/s10750-011-0647-y Reconstructed long-term time series of phytoplankton primary production of a large shallow temperate lake: the basis to assess the carbon balance and its climate sensitivity [Elektronische Daten] [Tiina Nõges, Helgi Arst, Alo Laas, Tuuli Kauer, Peeter Nõges, Kaire Toming] Aiming at building the carbon budget for further climate change impact research in the large and shallow northern temperate Lake Võrtsjärv, the present paper focuses on reconstructing the full phytoplankton primary production (PP) data series for the lake for the period of 1982-2009 covered by disconnected measurements, and testing the uncertainties involved both in the PP measurements and bio-optical modelling. During this 28-year period, in situ PP was measured in Võrtsjärv in 18years with 14C-assimilation technique. We reconstructed the full time series using a semi-empirical PP simulation model based on continuously measured PAR irradiance and interpolated values of monthly measured chlorophyll a (C chl). The modelling results, which proved highly reliable during the calibration phase, correlated rather weakly with the annual PP estimates for the 18years, which were based on 2-h incubations at midday, 1-2 times per month. Being based on continuous irradiance data, the modelled PP can be considered more reliable than the sparse measurements, especially for short to medium term studies. We demonstrate that in the long-term, the bio-optical method can be biased if changes in water colour or water level alter the light climate causing adaptive responses in the cellular chlorophyll content of light-limited phytoplankton. Springer Science+Business Media B.V., 2011 Phytoplankton nationallicence Primary production nationallicence Võrtsjärv nationallicence Shallow eutrophic lake nationallicence Modelling nationallicence Light limitation nationallicence Nõges Tiina Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut Arst Helgi Estonian Marine Institute, University of Tartu, Mäealuse St. 14, 12618, Tallinn, Estonia aut Laas Alo Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut Kauer Tuuli Estonian Marine Institute, University of Tartu, Mäealuse St. 14, 12618, Tallinn, Estonia aut Nõges Peeter Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut Toming Kaire Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut Hydrobiologia Springer Netherlands 667/1(2011-06-01), 205-222 0018-8158 667:1<205 2011 667 10750 https://doi.org/10.1007/s10750-011-0647-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0647-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nõges Tiina Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut NATIONALLICENCE 700 1- Arst Helgi Estonian Marine Institute, University of Tartu, Mäealuse St. 14, 12618, Tallinn, Estonia aut NATIONALLICENCE 700 1- Laas Alo Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut NATIONALLICENCE 700 1- Kauer Tuuli Estonian Marine Institute, University of Tartu, Mäealuse St. 14, 12618, Tallinn, Estonia aut NATIONALLICENCE 700 1- Nõges Peeter Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut NATIONALLICENCE 700 1- Toming Kaire Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 61117 Rannu, Tartumaa, Estonia aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 667/1(2011-06-01), 205-222 0018-8158 667:1<205 2011 667 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer