Sand banks contribute to the production of coastal waters by making a habitat for benthic microalgae in the sublittoral zone: food web analyses in Aki-Nada using stable isotopes
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- Yoshino Kenji
- Center for Marine Environmental Studies, Ehime University
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- Miyasaka Hitoshi
- Center for Marine Environmental Studies, Ehime University
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- Kawamura Yuji
- Center for Marine Environmental Studies, Ehime University
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- Genkai-Kato Motomi
- Center for Marine Environmental Studies, Ehime University
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- Okuda Noboru
- Center for Marine Environmental Studies, Ehime University
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- Hayami Yuichi
- Center for Marine Environmental Studies, Ehime University
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- Ito Sayaka
- Center for Marine Environmental Studies, Ehime University
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- Fukumori Kayoko
- Center for Marine Environmental Studies, Ehime University
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- Sekiguchi Tomohiro
- Center for Marine Environmental Studies, Ehime University
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- Ohnishi Hidejiro
- Center for Marine Environmental Studies, Ehime University
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- Ohmori Koji
- Center for Marine Environmental Studies, Ehime University
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- Takeoka Hidetaka
- Center for Marine Environmental Studies, Ehime University
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Abstract
There are many sand banks in Seto Inland Sea, making patchy shallow zones less than 10 m deep. Due to the shallow environment, the surface sediment on the sand banks in the Hojo area, in the southern part of Aki Nada, Shikoku Island, Japan, often has a larger amount of benthic microalgae than other areas. We hypothesized that benthic microalgae contributed to the secondary production of coastal waters around sand bank areas, and investigated the food-web structure of the Hojo area using stable isotopes in early summer, mid summer and fall. Mean carbon isotopic signatures of several consumers in early summer (−16.9 to −15.1‰ for polychaeta; −17.3 to 13.9‰ for brachyuran crabs; −17.2 to −15.3 for fish) and fall (−16.2 to −14.3‰ for shrimps; −14.0 to −11.2‰ for brachyuran crabs) were more enriched than that of the particulate organic materials of the surface water around sand banks (mainly phytoplankton) (−20.5±0.0‰ in early summer and −18.3±0.1‰ in fall). Organic materials attached to cobbles, representative of benthic microalgae, showed similar or more enriched signatures than consumers (−14.7±0.0‰ in early summer and −10.3±0.0‰ in fall). These results suggest that benthic microalgae on the sand bank contribute greatly to the secondary or higher production of coastal waters in Hojo area.
Journal
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- Plankton and Benthos Research
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Plankton and Benthos Research 1 (3), 155-163, 2006
The Plankton Society of Japan, The Japanese Association of Benthology
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Details 詳細情報について
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- CRID
- 1390001205265765376
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- NII Article ID
- 10018242631
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- NII Book ID
- AA12130745
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- ISSN
- 1882627X
- 18808247
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- NDL BIB ID
- 8055614
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed