{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360004240189979520.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.5194/bg-12-6781-2015"}},{"identifier":{"@type":"URI","@value":"https://bg.copernicus.org/articles/12/6781/2015/bg-12-6781-2015.pdf"}},{"identifier":{"@type":"DOI","@value":"10.5194/bgd-12-11089-2015"}},{"identifier":{"@type":"URI","@value":"https://bg.copernicus.org/preprints/12/11089/2015/bgd-12-11089-2015.pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Chlorophyll\n                    <i>a</i>\n                    -specific Δ\n                    <sup>14</sup>\n                    C, δ\n                    <sup>13</sup>\n                    C and δ\n                    <sup>15</sup>\n                    N values in stream periphyton: implications for aquatic food web studies"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>Abstract. Periphytic algae attached to a streambed substrate (periphyton) are an important primary producer in stream ecosystems. We determined the isotopic composition of chlorophyll a in periphyton collected from a stream flowing on limestone bedrock in the Seri River, central Japan. Stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) and natural radiocarbon abundances (Δ14C) were measured in chlorophyll a (δ13Cchl, δ15Nchl and Δ14Cchl) and bulk (δ13Cbulk, δ15Nbulk and Δ14Cbulk) for periphyton, a pure aquatic primary producer (Cladophora sp.) and a terrestrial primary producer (Quercus glauca). Periphyton δ13Cbulk and δ13Cchl values did not necessarily correspond to δ13Cbulk for an algal-grazing specialist (Epeorus latifolium). Periphyton Δ14Cchl values (−258 ‰ in April and −190 ‰ in October) were slightly lower than Δ14Cbulk values (−228 ‰ in April and −179 ‰ in October) but were close to the Δ14C value for dissolved inorganic carbon (DIC; −217 ± 31 ‰), which is a mixture of weathered carbonates (Δ14C = −1000 ‰), CO2 derived from aquatic and terrestrial organic matters (variable Δ14C) and dissolved atmospheric CO2 (Δ14C approximately +30 ‰ in 2013). Δ14Cchl values were also close to Δ14Cbulk for E. latifolium (−215 ‰ in April and −199 ‰ in October) and Cladophora sp. (−210 ‰), whereas the Δ14Cbulk value for Q. glauca (+27 ‰) was closer to Δ14C for atmospheric CO2. Although the bulk isotopic composition of periphyton is recognised as a surrogate for the photosynthetic algal community, natural periphyton is a mixture of aquatic and terrestrial organic materials. Our results indicate that the bulk periphyton matrix at the study site consists of 89 to 95 % algal carbon (derived from 14C-depleted DIC) and 5 to 11 % terrestrial organic carbon (derived from 14C-enriched atmospheric CO2).</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004240189979648","@type":"Researcher","foaf:name":[{"@value":"N. F. Ishikawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004240189979393","@type":"Researcher","foaf:name":[{"@value":"M. Yamane"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004240189979392","@type":"Researcher","foaf:name":[{"@value":"H. Suga"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004240189979651","@type":"Researcher","foaf:name":[{"@value":"N. O. Ogawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004240189979649","@type":"Researcher","foaf:name":[{"@value":"Y. Yokoyama"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004240189979650","@type":"Researcher","foaf:name":[{"@value":"N. Ohkouchi"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"17264189"}],"prism:publicationName":[{"@value":"Biogeosciences"}],"dc:publisher":[{"@value":"Copernicus GmbH"}],"prism:publicationDate":"2015-11-26","prism:volume":"12","prism:number":"22","prism:startingPage":"6781","prism:endingPage":"6789"},"reviewed":"false","dc:rights":["https://creativecommons.org/licenses/by/3.0/"],"url":[{"@id":"https://bg.copernicus.org/articles/12/6781/2015/bg-12-6781-2015.pdf"},{"@id":"https://bg.copernicus.org/preprints/12/11089/2015/bgd-12-11089-2015.pdf"}],"createdAt":"2015-11-26","modifiedAt":"2025-02-08","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=QE1-996.5","dc:title":"QE1-996.5"},{"@id":"https://cir.nii.ac.jp/all?q=Ecology","dc:title":"Ecology"},{"@id":"https://cir.nii.ac.jp/all?q=Life","dc:title":"Life"},{"@id":"https://cir.nii.ac.jp/all?q=QH501-531","dc:title":"QH501-531"},{"@id":"https://cir.nii.ac.jp/all?q=Geology","dc:title":"Geology"},{"@id":"https://cir.nii.ac.jp/all?q=QH540-549.5","dc:title":"QH540-549.5"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782282060032","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"26247085"},{"@type":"JGN","@value":"JP26247085"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26247085/"}],"notation":[{"@language":"ja","@value":"気候システムにおける氷床変動の役割の解明"},{"@language":"en","@value":"Ice sheet fluctuations in the past and global climate changes"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282256750675200","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"13J01021"},{"@type":"JGN","@value":"JP13J01021"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13J01021/"}],"notation":[{"@language":"ja","@value":"化合物レベルの同位体分析を用いた河川食物網の高精度解析"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282257215399168","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"25247092"},{"@type":"JGN","@value":"JP25247092"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25247092/"}],"notation":[{"@language":"ja","@value":"アミノ酸の放射性炭素年代による堆積物年代測定法の確立"},{"@language":"en","@value":"Development of sediment chronologies with amino acid radiocarbon dating"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001335723719936","@type":"Article","resourceType":"学術雑誌論文(journal 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