Yoshito Chikaraishi
Japan Agency for Marine-Earth Science and Technology
Publications 146
Abstract. Nitrogen (N) availability influences patterns of terrestrial productivity and global carbon cycling, imparting strong but poorly resolved feedbacks on Earth's climate system. Central questions concern the timescale of N cycle response to elevated CO 2 concentration in the atmosphere, and whether availability of this limiting nutrient increases or decreases with climate change. Nitrogen isotopic composition of bulk plant leaves provides information on large-scale patterns of N availabil...
#1Riko Takeuchi (Tokyo University of Pharmacy and Life Sciences)
#2Yoshito Chikaraishi (Hokkaido University)H-Index: 30
Last.Hidetoshi Kumata (Tokyo University of Pharmacy and Life Sciences)H-Index: 14
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#1Kaycee E. Morra (MSU: Michigan State University)H-Index: 1
#2Yoshito Chikaraishi (Hokkaido University)H-Index: 30
Last.Peggy H. Ostrom (MSU: Michigan State University)H-Index: 33
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We investigated how foraging habits vary among three ecologically distinct wide-ranging seabirds. Using amino acid δ15N proxies for nutrient regime (δ15NPhe) and trophic position (Δδ15NGlu-Phe), we compared Newell’s shearwater (Puffinus newelli) and Laysan albatross (Phoebastria immutabilis) foraging habits over the past 50–100 years, respectively, to published records for the Hawaiian petrel (Pterodroma sandwichensis). Standard ellipses constructed from the isotope proxies show that inter-popul...
#1Haruna Sugahara (CNRS: Centre national de la recherche scientifique)H-Index: 2
#2Yoshinori Takano (JAMSTEC: Japan Agency for Marine-Earth Science and Technology)H-Index: 18
Last.Hisayoshi Yurimoto (Hokkaido University)H-Index: 48
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#1Takashi Korenaga (Chiba Institute of Science)H-Index: 20
#2Yaeko Suzuki (National Agriculture and Food Research Organization)
Last.Yoshito Chikaraishi (Hokkaido University)H-Index: 30
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Abstract During the last few decades, Japanese nation and consumers have required the study using stable isotope analysis of five major biochemical elements: hydrogen (D/H), carbon ( 13 C/ 12 C), nitrogen ( 15 N/ 14 N), oxygen ( 18 O/ 16 O), and sulfur ( 34 S/ 32 S), in beverages and foods to produce a chemical tool for the inspection against convincing disguises in the food authenticity. Such studies have been accelerated by recent advances in isotope ratio mass spectrometry (IRMS) and cavity r...
#1Yoshinori Takano (JAMSTEC: Japan Agency for Marine-Earth Science and Technology)H-Index: 18
#2Yoshito Chikaraishi (Hokkaido University)H-Index: 30
Last.Naohiko Ohkouchi (JAMSTEC: Japan Agency for Marine-Earth Science and Technology)H-Index: 39
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Oceanic methane from global deep-sea sediment is largely consumed through microbially mediated sulfate-coupled oxidation, resulting in 13C-depleted cell biomass of anaerobic methanotrophic archaea (ANME). The general ecological importance of subseafloor ANME has been well recognized in the last two decades. However, the crucial biochemical pathways for the overall anaerobic oxidation of methane (AOM) still remain enigmatic. Here, methanotrophic pathways were analyzed to trace 13C-depleted amino ...