Abstract
Harmonizing coastal fisheries with water-quality improvement has become an essential factor for the sustainable use of coastal ecosystem services. Here, we present the scope of our study based on an interdisciplinary approach including ecological actions, socio-economic actions and socio-psychological actions. We chose to focus on the interaction between oyster aquaculture and seagrass vegetation as a typical ecological action using the coastal ecosystem complex (CEC) concept. Coastal organisms have adapted their traits to the environment over a long period of time, so that restoration of the CEC represents reconstruction of the original process of coastal production. Subtidal seagrass vegetation with intertidal oyster reefs is the original CEC in Japan, which would be expected to enhance coastal production by improving the production efficiency without adding nutrients. A simple field experiment examining carbon and nitrogen contents and stable isotope ratios revealed that oyster spats cultivated on a tidal flat adjacent to seagrass beds had higher nitrogen contents and higher δ13C ratios than spats cultivated in an offshore area using only pelagic production. This result suggests that utilization of the CEC, which enables oysters to use both pelagic and benthic production, has potential to sustain a food provisioning service for humans, even in oligotrophic conditions.
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Acknowledgement
We would like to thank our French colleague, Yves Henocque for his various suggestions and immense help. This research could not have progressed without his considerable support. We are also grateful to the Japanese-French Oceanographic Society for offering this opportunity to present our research. We also thank C. J. Bayne for checking the English text. This study was supported by several funds including the FRA and Ifremer, by the Environment Research and Technology Development Fund (S-15) of the Ministry of the Environment, Japan, and by the JSPS SAKURA Programme (No. 17031011-000161).
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This article is sponsored by the Coastal Ecosystem Complex Project of the Ocean Resource Use Promotion Technology Development Program, the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Hori, M., Hamaoka, H., Hirota, M. et al. Application of the coastal ecosystem complex concept toward integrated management for sustainable coastal fisheries under oligotrophication. Fish Sci 84, 283–292 (2018). https://doi.org/10.1007/s12562-017-1173-2
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DOI: https://doi.org/10.1007/s12562-017-1173-2