Abstract
Submerged macrophytes have been disappearing from the Kanto Plain, Japan since the 1960s. This disappearance is usually attributable to the interaction between macrophytes and phytoplankton. Phytoplankton contributes to shading of the available light and changes the availability of inorganic carbon from free CO2 to HCO −3 for use in photosynthesis. However, limited information is available about the interaction between carbon fraction and submerged macrophytes through phytoplankton abundance. In this short note, we observe the distribution of submerged macrophytes and phytoplankton in a small canal. We found that, despite high photosynthetically active radiation (PAR) in the downstream region, low free CO2 concentration through phytoplankton abundance can deplete free CO2 for submerged macrophytes. In contrast, the upstream region exhibited macrophytes in an environment with high free CO2 concentration. The stable carbon isotope ratio of submerged macrophytes follows this pattern, with more positive values occurring in the downstream region and more negative values in the upstream region. It has been reported that phytoplankton limits light availability for submerged macrophytes, but carbon availability could also be a factor in the distribution of submerged macrophytes. Because the source of water for submerged macrophytes is groundwater, its preservation possibly plays a key role for the restoration of submerged macrophytes.
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Acknowledgments
We would like to thank Dr. Tabayashi and Mr. Kotagiri for their assistance with the analysis. We also thank Professor Yamamuro of the University of Tokyo for her helpful discussions. The corresponding author is a research fellow of the Japan Society for the Promotion of Science (JSPS).
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Shinohara, R., Asaeda, T. & Isobe, M. Effects of phytoplankton on the distribution of submerged macrophytes in a small canal. Landscape Ecol Eng 10, 115–121 (2014). https://doi.org/10.1007/s11355-013-0227-6
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DOI: https://doi.org/10.1007/s11355-013-0227-6