Differences in nitrogen and carbon stable isotopes between planktonic and benthic microalgae |
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Authors: | Hideyuki Doi Eisuke Kikuchi Shuichi Shikano Shigeto Takagi |
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Institution: | (1) Graduate School of Life Sciences, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;(2) Institute for Chemistry and Biology of the Marine Environment, Carl-von-Ossietzky University Oldenburg, Schleusenstrasse 1, 26382 Wilhelmshaven, Germany;(3) Center for Northeast Asian Studies, Tohoku University, Kawauchi, Aoba-ku, Sendai 980-8576, Japan |
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Abstract: | We compiled published data on the nitrogen and carbon stable isotope ratios of phytoplankton and benthic microalgae from lentic
systems and explored the primary factors determining the isotope values among systems. Also, we investigated seasonal changes
in nitrogen stable isotope ratios of phytoplankton and benthic microalgae in the strongly acidic lake, Lake Katanuma, which
has only two dominant species, Pinnularia acidojaponica as a benthic diatom and Chlamydomonas acidophila, a planktonic green alga. From the published dataset, it may be concluded that δ13C of benthic diatoms were more enriched than those of phytoplankton at the same sites, although the nitrogen isotope of phytoplankton
and benthic microalgae were similar. This differences in δ13C between benthic microalgae and phytoplankton could be explained by the boundary layer effect. On the other hand, nitrogen
isotope values of both benthic microalgae and phytoplankton were primarily controlled by the same environmental factor, and
boundary layer effects are not the primary factor determining the nitrogen isotope values of microalgae. Also, we showed temporal
dynamics in nitrogen isotopes of benthic and planktonic microalgae species in Lake Katanuma, and the trends of nitrogen isotopes
are similar between benthic and planktonic microalgae, as concluded from the published dataset. |
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