Photosynthesis and primary production in Lake Kasumigaura (Japan) monitored monthly since 1981

Ecological Research, Mar 2016

This study reports the primary production of phytoplankton determined with a 13C tracer, and their related variables, in Lake Kasumigaura, a shallow, hyper-eutrophic lake, and the second largest lake in Japan. Measurements were conducted monthly from August 1981 to December 2013 at four stations within the lake. Monitoring was a component of the Lake Kasumigaura Long-term Environmental Monitoring program, conducted by the National Institute for Environmental Studies (NIES) since 1977. The program collects data on water quality, and plankton and benthic communities. Lake Kasumigaura is registered as a core site of the Japan Long-term Ecological Research Network (JaLTER), which is a member of the International Long-term Ecological Research Network (ILTER). This dataset includes daily primary production (Pzd gC m−2 d−1) and the six parameters required to calculate Pzd: maximum photosynthesis rate (P max gC gC−1 h−1); light irradiance at the junction of the initial slope (α (gC gC−1 h−1) (μmol photon m−2 s−1)−1) and P max of the photosynthesis vs. irradiance (P vs. E) curve (E k μmol photon m−2 s−1); attenuation coefficient of photosynthetically available radiation (PAR) (K PAR m−1); water depth at each sampling station (Z b , m); dissolved inorganic carbon (DIC mgC L−1) and particulate organic carbon concentrations (POC gC m−3); and chlorophyll a amounts (Chl.a μg L−1). Daily primary production was calculated by obtaining a P vs. E curve over a short-term incubation (approximately 1 h) in a water tank using in situ water temperature in the laboratory, based on the field conditions of the sampling date. The dataset has been used for ecological studies as well as for management studies on water quality and ecosystems. This dataset is unique among the available published papers concerning lakes or primary production in various ecosystems, collected over a long period of time and freely available.

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Photosynthesis and primary production in Lake Kasumigaura (Japan) monitored monthly since 1981

Ecol Res Photosynthesis and primary production in Lake Kasumigaura (Japan) monitored monthly since 1981 Noriko Takamura Megumi Nakagawa This study reports the primary production of bon (DIC mgC L 1) and particulate organic carbon phytoplankton determined with a 13C tracer, and their concentrations (POC gC m 3); and chlorophyll a related variables, in Lake Kasumigaura, a shallow, hy- amounts (Chl.a lg L 1). Daily primary production was per-eutrophic lake, and the second largest lake in Japan. calculated by obtaining a P vs. E curve over a short-term Measurements were conducted monthly from August incubation (approximately 1 h) in a water tank using 1981 to December 2013 at four stations within the lake. in situ water temperature in the laboratory, based on the Monitoring was a component of the Lake Kasumigaura field conditions of the sampling date. The dataset has Long-term Environmental Monitoring program, con- been used for ecological studies as well as for manageducted by the National Institute for Environmental ment studies on water quality and ecosystems. This daStudies (NIES) since 1977. The program collects data on taset is unique among the available published papers water quality, and plankton and benthic communities. concerning lakes or primary production in various Lake Kasumigaura is registered as a core site of the ecosystems, collected over a long period of time and Japan Long-term Ecological Research Network (JaL- freely available. TER), which is a member of the International Longterm Ecological Research Network (ILTER). This da- Keywords Phytoplankton Æ Chlorophyll a Æ Carbon taset includes daily primary production (Pzd gC m 2 fixation with 13C Æ Primary production Æ Photosynthesis d 1) and the six parameters required to calculate Pzd: vs. irradiance (P vs. E) curve Æ Maximum photosynthesis maximum photosynthesis rate (Pmax gC gC 1 h 1); light rate Æ Shallow and eutrophic lake Æ Lake irradiance at the junction of the initial slope (a (gC gC 1 Kasumigaura Æ Long-term Ecological Research h 1) (lmol photon m 2 s 1) 1) and Pmax of the photo- (LTER) Æ Ecosystem function synthesis vs. irradiance (P vs. E) curve (Ek lmol photon m 2 s 1); attenuation coefficient of photosynthetically Ecological Research Data Paper Archives http://db.cger. eaavcahilasbalmeprlaidngiatsitoantio(PnA(ZRb), (mK)P;AdRismsolv1)e;dwinatoerrgadneipcthcaar-t nAicecs.egsosi.ojpn/JnauLmTbEeRr:/EERR_DDPa-2ta0P1a6p-0e1rs/ The complete data set for this abstract published in the Data Paper section of the journal is available in electronic format in at Ecological Research Data Paper Archives http://db.cger.nies.go.jp/ JaLTER/ER_DataPapers/archives/2016/ERDP-2016-01.


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Noriko Takamura, Megumi Nakagawa. Photosynthesis and primary production in Lake Kasumigaura (Japan) monitored monthly since 1981, Ecological Research, 2016, 287, DOI: 10.1007/s11284-016-1347-x