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Seasonal variation of water-column light utilization efficiency for primary production in Saroma-ko Lagoon

Published online by Cambridge University Press:  13 January 2021

Akihiro Shiomoto Open the ORCID record for Akihiro Shiomoto [Opens in a new window]  and
Yushi Kamuro
Akihiro Shiomoto*
Affiliation:
Faculty of Bioindustry, Tokyo University of Agriculture, 196 Yasaka, Abashiri, Hokkaido099-2493, Japan
Yushi Kamuro
Affiliation:
Graduate School of Environmental Science, Hokkaido University, North 10 West 5, Kita-ku, Sapporo, Hokkaido060-810, Japan
*
Author for correspondence: Akihiro Shiomoto, E-mail: [email protected]
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Abstract

In Saroma-ko Lagoon, where scallop aquaculture is a thriving commercial activity, monitoring primary production is essential for determining the amount of scallops that can be farmed. Using the primary production data obtained so far, we calculated Ψ, an index of water-column light utilization efficiency, and clarified its seasonal variation. Ψ tended to be lower in the spring bloom season (February–April), and higher in the late autumn to winter (October–December). Low chlorophyll-normalized production, an index of growth rate, resulted in lower values, while low daily irradiance resulted in higher values. The values of Ψ from our study had a range of 0.05–1.42 gC gChl-a−1 mol photons−1 m2 (N = 56). These values were within the previously reported range of 0.07–1.92 (gC gChl-a−1 mol photons−1 m2) for seawater and fresh water worldwide. Therefore, it is likely that Ψ varies from 0.05–2 gC gChl-a−1 mol photons−1 m2, being affected by conditions of phytoplankton growth and sunlight intensity, regardless of whether samples are collected from seawater or fresh water. Using the median Ψ value of 0.45 gC gChl-a−1 mol photons−1 m2 obtained in this study, primary production was 0.3–3.5 times the actual production at Saroma-ko Lagoon. Using this method, primary production can be easily and constantly monitored, facilitating the sustainable development of scallop aquaculture.

Keywords

Chlorophyll-achlorophyll-normalized productionlight utilization efficiencyprimary productionSaroma-ko LagoonΨ
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 101 , Issue 1 , February 2021 , pp. 39 - 47
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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