Abstract
We investigated the water-column light utilization efficiency (Ψ) of phytoplankton photosynthesis in the Western Subarctic Gyre (WSG) of the North Pacific during summer 2008. The Ψ values (0.64–1.86 g C [g Chl a]−1 [mol photon]−1 m2) obtained were observed to increase significantly with decreasing daily photosynthetic available radiation (PAR) and were generally higher than those of previous studies, not only from the subarctic Pacific but also from the world’s oceans. To examine the effect of iron availability on Ψ in the WSG, Ψ values were estimated from the data of two in situ iron fertilization experiments: the Subarctic Pacific Iron Experiment for Ecosystem Dynamics Study I (SEEDS-I) and II (SEEDS-II). We found that iron availability did not affect Ψ values. Overall, this study revealed that Ψ values changed remarkably in the WSG during the summer, and that higher values were found at the stations where moderate PAR levels (ca. 10–30 mol photons m−2 day−1) were observed and where autotrophic flagellates predominated in the phytoplankton assemblages.
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Acknowledgments
We wish to thank the captain, crew, and scientists of the R/V Hakuho-Maru (JAMSTEC, Japan), FR/V Kaiyo-Maru (Fisheries Agency of Japan), and R/V Kilo Moana (University of Hawaii, USA) for their helpful assistance. We are also grateful to Dr. A. Sugimoto and Ms. Y. Hoshino for technical support in the POC and the 13C measurements. Thanks are extended to Dr. Y. W. Watanabe for the TIC measurements. This study was partly supported by the Ministry of Education, Culture, Sports, Science and Technology (#18067008 and #24121004) and the Japan Society for the Promotion of Science (#22310002).
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Nosaka, Y., Isada, T., Kudo, I. et al. Light utilization efficiency of phytoplankton in the Western Subarctic Gyre of the North Pacific during summer. J Oceanogr 70, 91–103 (2014). https://doi.org/10.1007/s10872-013-0217-1
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DOI: https://doi.org/10.1007/s10872-013-0217-1