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Geographic Variability of Fish Carcass-Associated Microbial Communities
Yasutake Kawamoto1, Jotaro Urabe1
1Graduate School of Life Science, Tohoku University, Sendai, Japan.
Environmental Microbiology Reports
|July 23, 2026
Summary
Animal carcasses create unique microbial communities. However, these carcass-associated microbial communities vary significantly by geographic location and local environmental conditions, not by a universal carcass effect.
Area of Science:
- Marine microbiology
- Ecology
- Biogeochemistry
Background:
- Animal carcasses are nutrient-rich resources supporting distinct microbial communities in marine environments.
- Understanding geographic variation in carcass-associated microbial communities is crucial for marine ecology.
Purpose of the Study:
- To investigate how carcass-associated microbial communities (bacteria and ciliophorans) differ across geographically distinct tidal flats.
- To determine the influence of local environmental factors versus a general carcass effect on these communities.
Main Methods:
- Deployment of sardine carcasses on surface sediments at seven tidal flats along the Japanese archipelago.
- Comparison of microbial communities in sediments with and without carcasses, focusing on bacterial and ciliophoran taxonomic composition.
Main Results:
- Both bacterial and ciliophoran communities associated with carcasses showed significant differences among the studied sites.
- Geographic location and local environmental conditions strongly influenced community composition, overriding the effect of carcass addition.
Conclusions:
- Carcass-associated microbial communities are primarily shaped by local species pools and environmental conditions.
- A universal carcass-driven effect on microbial community composition across geographically distinct sites is unlikely.
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