2022 Fiscal Year Annual Research Report

生態学的化学量論による植物プランクトンと細菌群集との相互作用の検討

Research Project

Project/Area Number	21J15473
Research Institution	Kyoto University
Principal Investigator	JIANG MENGQI 京都大学, 理学研究科, 特別研究員(DC2)
Project Period (FY)	2021-04-28 – 2023-03-31
Keywords	phytoplankton / nitrogen / phosphorus / growth rate hypothesis / stoichiometry
Outline of Annual Research Achievements	In the present study, the growth rate hypothesis (GRH) was demonstrated to be inapplicable for Chlorella vulgaris, a type of green algae, under N starvation. In fact, the research showed that under low nutrient levels, the organism had a higher requirement for nitrogen than phosphorus. This suggests that the causality of nitrogen, protein, and biomass under phosphorus starvation may be different from what was previously assumed. Our results indicated that N, rather than P, would be the primary element limiting phytoplankton growth under low-nutrient conditions. If this phenomenon is applicable for all phytoplankton species, it could be valid for controlling phytoplankton biomass in aquatic ecosystems, and could improve biomass management of blooming phytoplankton by emphasizing a specific nutrient.
Research Progress Status	令和4年度が最終年度であるため、記入しない。
Strategy for Future Research Activity	令和4年度が最終年度であるため、記入しない。