Chlorophyll-specific absorption coefficients and pigments of phytoplankton off Sanriku, northwestern North Pacific |
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Authors: | Koji Suzuki Motoaki Kishino Kousei Sasaoka Sei-Ichi Saitoh Toshiro Saino |
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Institution: | (1) Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Chikusa-ku, 464-8601 Nagoya, Japan;(2) The Institute of Physical and Chemical Research, 351-0198 Wako, Saitama, Japan;(3) Faculty of Fisheries, Hokkaido University, 041-8611 Hakodate, Hokkaido, Japan |
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Abstract: | The variety in shape and magnitude of thein vivo chlorophyll-specific absorption spectra of phytoplankton was investigated in relation to differences in pigment composition
off Sanriku, northwestern North Pacific. Site-to-site variations of the absorption coefficients,a
ph
* (λ), and pigment composition were clearly observed. At warm-streamer stations, higher values ofa
ph
* (440) anda
ph
* (650) were found with relatively high concentrations of chlorophyllb (a green algae marker). At stations located in the Oyashio water (cold streamer),a
ph
* (440) values were lower and fucoxanthin (a diatom marker) concentrations were higher, compared to the other stations. The
peak in the absorption spectra at the Oyashio stations was shifted toward shorter wavelengths, which was probably due to the
presence of phaeopigments. In a Kuroshio warm-core ring, the magnitude ofa
ph
* (440) was in between those at the warm-streamer and Oyashio stations, and the diagnostic pigment was peridinin (a dinoflagellate
marker). These findings indicated that major differences in phytoplankton absorption spectra of each water mass were a result
of differences in the phytoplankton pigment composition of each water mass, which was probably related to the phytoplankton
community. |
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Keywords: | Phytoplankton absorption phytoplankton pigments off Sanriku North Pacific |
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