Benthic quality assessment using M-AMBI in the Seto Inland Sea, Japan
Akira Umehara1, Satoshi Nakai2, Tetsuji Okuda3
1Environmental Research and Management Center, Hiroshima University, 1-5-3 Kagamiyama, Higashi-hiroshima, Hiroshima, 739-8513, Japan.
Marine Environmental Research
|May 19, 2019
Summary
Benthic invertebrates in the Seto Inland Sea were assessed using the multivariate AZTI Marine Biotic Index (M-AMBI). This index effectively indicated ecological status, correlating well with sediment quality and providing a reliable measure for Japanese coastal health.
Area of Science:
- Marine Ecology
- Benthic Ecology
- Environmental Monitoring
Background:
- Benthic invertebrates are key indicators of seafloor health, responding to environmental stressors.
- Assessing coastal ecosystem health is crucial for effective environmental management.
Purpose of the Study:
- To evaluate the ecosystem health of the Seto Inland Sea using the multivariate AZTI Marine Biotic Index (M-AMBI).
- To test the applicability of M-AMBI in a Japanese coastal sea with endemic species.
Main Methods:
- Application of the M-AMBI index across 384 out of 415 surveyed locations.
- Statistical correlation analysis between M-AMBI, other biotic indices (AMBI, Richness, H'), and sediment physico-chemical parameters (TOC, sulfide, ORP).
Main Results:
- A significant correlation was found between M-AMBI and sediment quality parameters like TOC, sulfide content, and ORP.
- Organically enriched sediments with high TOC, mud, and sulfide content corresponded to low M-AMBI values (bad-poor ecological status).
- Unpolluted sandy sediments were associated with high M-AMBI values (high-good ecological status).
Conclusions:
- The M-AMBI is a valuable biotic index for assessing benthic ecological status in Japanese coastal waters.
- M-AMBI effectively reflects comprehensive sediment quality, making it suitable for environmental health assessments in the region.
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