相模川河口域における長期環境変動のモニタリング12 海況と植物プランクトン分布 2025年１月
Year: 2025
Type: article
Abstract: In January 2025, measurements of sea conditions and the phytoplankton community structure were carried out in the Sagami River Estuary. Typically, this area has three water mass types : brackish, coastal, and open ocean. However, a limited brackish water mass and uniform coastal water mass (due to vertical mixing) were noted. No open ocean water mass, usually characterized by high temperature and salinity, was detected. The brackish water mass contained high densities of freshwater diatoms, but chlorophyll a concentrations did not correlate with cell counts and were low. The coastal water mass also had low chlorophyll a concentrations, similar to the lowest values recorded in 2023. Species diversity of the phytoplankton community was also lower than the 2023 minimum, with only 22 diatom and 7 flagellate species being the lowest on record
DOI: 10.24792/0002001845
Language: Japanese
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7207796435