Biogeosciences

Comparisons of strontium isotope ratios in the water and otoliths suggest narrow habitat ranges of freshwater three-spined sticklebacks in Otsuchi, Japan

Konomi Uji, Takanori Nakano, Ki-Cheol Shin, Seiichi Mori, Manabu Kume, Shotaro Nishida, Ichiro Tayasu

Discrepancies between feeding ecology and trophic position based on nitrogen isotopic composition in endosymbiont-bearing benthic foraminifers

Ayumi Maeda, Yuichi I. Naito, Masashi Tsuchiya, Yoshito Chikaraishi, Kazuhiko Fujita, Naohiko Ohkouchi, Hodaka Kawahata

Tracing terrestrial nitrogen contributions to the salt marsh food web of the Obitsu River estuary in Tokyo Bay using compound-specific δ¹⁵N analysis of amino acids

Satoshi Furota, Naoto F. Ishikawa, Nanako O. Ogawa, Toshio Furota, Naohiko Ohkouchi

Reassessing the origin of organic compounds in Mariana forearc serpentinite mud volcanoes: insights from isotopologue and molecular signatures

Koudai Taguchi, Shinsuke Kawagucci, Alexis Gilbert, Yuichiro Ueno, Yohei Matsui, Yoshinori Takano, Eiji Tasumi, Masayuki Miyazaki, Akiko Makabe, Junichi Miyazaki, Hikaru Sawada, Naoto Takahata, Ken Takai

Ocean acidification and changes in biological production in the western subarctic region of the North Pacific over the quarter century, 1999–2023

Masahide Wakita, Akira Nagano, Hiroshi Uchida, Yoshiyuki Nakano, Katsunori Kimoto, Masahito Shigemitsu, Kana Nagashima, Fumikazu Taketani, Tetsuichi Fujiki, Maki Noguchi-Aita, Kosei Sasaoka, Tsuneo Ono, Toshihiko Takemura

Carbon isotopic changes of 16 proteinogenic amino acids during trophic transfer in a cultured marine consumer

Yuchen Sun, Naoto F. Ishikawa, Nanako O. Ogawa, Yoshinori Takano, Naohiko Ohkouchi

Dynamics of sulfate and nitrate in a temperate stream network: combining multi-isotope analysis and generalized linear mixed-effects models for precautionary conservation

Lei Fujiyoshi, Ichiro Tayasu, Shiho Yabusaki, Takashi F. Haraguchi, Chikage Yoshimizu, Ken’ichi Ohkushi, Fumiko Furukawa, Masayuki Itoh, Tadashi Yokoyama, Hiromune Mitsuhashi

Enhancing nitrogen status evaluation using qualitative indicators: a case study in Matsushima Bay, Japan

Mengqi Jiang, Tetsuroh Ishikawa, Keisuke Takatsudo, Ken’ichi Osaka, Nay Lin Maung, Hirotsugu Arai, Akiko Makabe, Naoko Tokuchi, Kentaro Hayashi, Keisuke Koba

Estimation of methane emissions from inundated areas in northern Eurasia using a process-based model and remotely sensed inundation dynamics data

Akihiko Ito, Hirokli Mizuochi, Tetsuya Hiyama

Working standards and analytical framework for CSIA: isotopic composition (δ¹³C, δ¹⁵N, and δ³⁴S) of 21 amino acids and 7 nucleobases

Nanako O OGAWA, Yoshinori Takano, Yu Itahashi, Naoto F Ishikawa, Naohiko Ohkouchi