Application of the coastal ecosystem complex concept toward integrated management for sustainable coastal fisheries under oligotrophication
|Author(s)||Hori Masakazu1, Hamaoka Hideki1, Hirota Masahito2, Lagarde Franck3, Vaz Sandrine3, Hamaguchi Masami1, Hori Juri2, Makino Mitsutaku2|
|Affiliation(s)||1 : Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries, Environm Inland Sea, 2-17-5 Maruishi, Hiroshima 7390452, Japan.
2 : Japan Fisheries Res & Educ Agcy, Natl Res Inst Fisheries Sci, Yokohama, Kanagawa, Japan.
3 : Ifremer UMR MARBEC, F-34200 Sete, France.
|Source||Fisheries Science (0919-9268) (Springer Japan Kk), 2018-03 , Vol. 84 , N. 2 , P. 283-292|
|WOS© Times Cited||8|
|Note||Special Feature: Original Article Coastal Ecosystem Complex (CEC)|
|Keyword(s)||Oyster aquaculture, Seagrass, Indigenous and local knowledge, Integrated coastal management|
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.