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タイトル: | Spatiotemporal dynamics of stable carbon isotope ratios in two sympatric oligohaline copepods in relation to the estuarine turbidity maximum (Chikugo River, Japan): implications for food sources |
著者: | Suzuki, K. W. Ueda, H. Nakayama, K. Tanaka, M. |
著者名の別形: | 鈴木, 啓太 |
キーワード: | copepod estuarine turbidity maximum Pseudodiaptomus inopinus salinity Sinocalanus sinensis |
発行日: | 26-Sep-2013 |
出版者: | Oxford University Press |
誌名: | Journal of Plankton Research |
巻: | 36 |
号: | 2 |
開始ページ: | 461 |
終了ページ: | 474 |
抄録: | To improve our understanding of high copepod productivity in the estuarine turbidity maximum (ETM) of the macrotidal Chikugo River estuary in southwestern Japan, we determined stable carbon isotope ratios (δ[13]C) in the sympatric oligohaline copepods Sinocalanus sinensis andPseudodiaptomus inopinus from 2005 to 2006. Terrestrial-plant and phytoplankton detritus always accumulated in the ETM (salinity 0.1–3), whereas outside the ETM phytoplankton dominated especially in the warm season (>20°C). In contrast to the year-round concentration of S. sinensisin the ETM, P. inopinus occurred widely along the upper estuary under phytoplankton-dominated conditions. Terrestrial-plant detritus was characterized by relatively constant δ[13]C (∼−24‰), suggesting that significant spatiotemporal variability in copepod δ[13]C was attributable to the feeding of copepods on phytoplankton and/or its detritus. Both copepods had relatively depleted δ[13]C values in the ETM, reflecting δ[13]C in freshwater/oligohaline phytoplankton ( < −24‰). However, relatively enriched δ[13]C values (>−24‰) associated with meso/polyhaline phytoplankton downstream from the ETM were found only in P. inopinus. Although the contribution of terrestrial-plant detritus to copepod production remains to be determined, our results indicate that both copepods selectively utilize freshwater/oligohaline phytoplankton and/or its detritus in the ETM, whereas only P. inopinus utilizes meso/polyhaline phytoplankton downstream from the ETM. |
著作権等: | This article has been accepted for publication in "Journal of Plankton Research" © The Author 2013. Published by Oxford University Press. All rights reserved. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/199858 |
DOI(出版社版): | 10.1093/plankt/fbt094 |
出現コレクション: | 学術雑誌掲載論文等 |
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