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Possibility of direct utilization of seagrass and algae as main food resources by small gastropod, Lacuna decorata, in a subarctic lagoon, Hichirippu, eastern Hokkaido, Japan with stable isotope evidences of carbon and nitrogen

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タイトル: Possibility of direct utilization of seagrass and algae as main food resources by small gastropod, Lacuna decorata, in a subarctic lagoon, Hichirippu, eastern Hokkaido, Japan with stable isotope evidences of carbon and nitrogen
著者: Kajihara, Rumiko 著作を一覧する
Komorita, Tomohiro 著作を一覧する
Hamada, Akemi 著作を一覧する
Shibanuma, Seiichiro 著作を一覧する
Yamada, Toshiro 著作を一覧する
Montani, Shigeru 著作を一覧する
キーワード: food resource
gastropod
green algae
Lacuna decorata
lagoon
seagrass
stable isotope
Zostera japonica
発行日: 2010年
誌名: Plankton and Benthos Research
巻: 5
号: 3
開始ページ: 90
終了ページ: 97
出版社 DOI: 10.3800/pbr.5.90
抄録: The small gastropod, Lacuna decorata Adams, living on macrophytobenthos or surface sediment, is one of the most dominant species of macrozoobenthos in Hichirippu lagoon covered with seagrass and macroalgae, eastern Hokkaido, Japan. We measured the standing stocks of primary producers and macrozoobenthos, and determined the stable carbon and nitrogen isotope ratios of the primary producers and L. decorata. With these results, we identify the main food items for L. decorata and discuss the feeding strategy of the small gastropod. This gastropod occupied about 64% in density and about 25% in biomass of the macrozoobenthos at all six sampling stations in the lagoon. It occurred densely on the surface of the sediment with dense patches of benthic microalgae (BMA), which contained extremely high levels of Chl.-a between 84 to 226 mg m−2 throughout the period of this study. Nevertheless, the stable isotope signatures of carbon and nitrogen of this gastropod clearly show the direct utilization of organic matter derived from seagrass, Zostera japonica, in the areas where the seagrass luxuriated. However, it shows also a flexible feeding strategy in food preference. It fed green algae such as Ulva pertusa and Urospora wormskioldii in the areas where the seagrass grew scarcely.
Rights: © 2010 Plankton Society of Japan and Japanese Association of Benthology
資料タイプ: article
URI: http://hdl.handle.net/2115/67174
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 門谷 茂

 

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