Eutrophication trends in the coastal region of the Great Tokyo area based on long-term trends of Secchi depth.

ABSTRACT:

Background

The coastal ocean's environment has changed owing to human activity, with eutrophication becoming a global concern. However, oligotrophication occurs locally and decreases fish production. Historically, the Secchi depth has been used as an index of primary productivity. We analyzed the results of over-a-half-century routine observations conducted in Sagami Bay and Tokyo Bay to verify the eutrophication/oligotrophication trend based on Secchi depth observations in a temperate coastal region near the Greater Tokyo area, which is highly affected by human activities.

Methods

Data recorded in the Kanagawa Prefecture from 1963 to 2018 were used in this study. After quality control, the observation area was divided into Tokyo Bay, the Uraga Channel (outer part of Tokyo B

SUBMITTER: Akada H 

PROVIDER: S-EPMC10389074 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature