Abstract
Understanding the environmental factors that shape planktonic communities is essential to understand the diversity of aquatic ecosystems. Gross primary production (GPP), community respiration (CR), and net community production (NCP) were measured from May to December in the inner part of Tokyo Bay, and the metabolic balance between GPP and CR was analyzed. Environmental variability was also analyzed by measuring temperature, salinity, nutrient, and chlorophyll a (Chl a) concentrations. The results showed a threshold GPP (GPP at GPP = CR) of 14.2 mmol O2 m−3 d−1 in the inner bay, while the mean value of CR was 41.0 mmol O2 m−3 d−1, six times higher than the mean values reported previously for coastal areas. This indicates that the surface layer of the inner bay is biologically productive with a highly heterotrophic population. In contrast, all NCPs were positive (NCP > 0, GPP/CR ratio: 3.80 ± 0.82) throughout the study period. NCP was strongly correlated with Chl a, indicating that the metabolic balance of the planktonic community in the inner part of Tokyo Bay is controlled by factors regulating the autotroph community, such as nutrient (especially phosphate) supply and water temperature.
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We express our deep thanks to the editor and two anonymous reviewers who provided many helpful and constructive comments. We also would like to thank Editage (www.editage.com) for English language editing.
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Hashimoto, S., Nagashima, H. Seasonal variation in metabolic rate of plankton community in the inner part of Tokyo Bay. J Oceanogr 79, 473–482 (2023). https://doi.org/10.1007/s10872-023-00691-8
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DOI: https://doi.org/10.1007/s10872-023-00691-8