First dataset of dissolved inorganic radiocarbon in the Tokara Strait

Lan, Hui; Hirabayashi, Shoko; Miyairi, Yosuke; Yokoyama, Yusuke

doi:10.2343/geochemj.gj23018

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Unlike conventional tracers, Δ 14 C is a proxy that is purely dependent on its source (for the calcium carbonate in otoliths, mainly dissolved inorganic carbon (DIC) in seawater), without the confounding effects of animal physiology and isotope fractionation (Larsen et al., 2018 ). The large geographic gradient of Δ 14 C values of DIC in the upper oceans constitutes another substantial advantage for 14 C as a tracer (Lan et al., 2023 ; Servettaz et al., 2019 ). 14 C produced in the upper atmosphere enters the ocean through the air–sea gas exchange of carbon dioxide and is transferred to deep waters by global ocean circulation (McNichol & Aluwihare, 2007 ).…”

Section: Introductionmentioning

confidence: 99%

Otolith radiocarbon signatures provide distinct migration history of walleye pollock around Hokkaido, Japan in the North‐Western Pacific

Ando,

Yokoyama,

Miyairi

et al. 2024

Ecology and Evolution

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Trace elements and stable isotope ratios in otoliths have been used as proxies for the migration history of teleosts; however, their application in oceanic fishes remains limited. This study reports the first use of radiocarbons in otoliths to evaluate the horizontal migration histories of an oceanic fish species, the walleye pollock Gadus chalcogrammus. We conducted radiocarbon analyses of three stocks sourced from Hokkaido, Japan. The radiocarbon concentrations from the outermost portion of the otoliths from the Japanese Pacific, Northern Japan Sea (JS), and Southern Okhotsk Sea (OS) stocks were in general agreement with the seawater radiocarbon concentration of the sampling region, suggesting that pollock of all three stocks generally inhabited the within the sea region where each pollocks were sampled throughout their life cycle. However, the radiocarbon signals also provided some indications that some JS and OS stocks may be migrating between different sea regions. The proposed novel approach of reconstructing the individual migration history of marine fish using radiocarbon in otoliths may help examine fish migration with a higher temporal and spatial resolution that could not be achieved by trace elements and stable isotope ratios.

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Section: Introductionmentioning

confidence: 99%

Otolith radiocarbon signatures provide distinct migration history of walleye pollock around Hokkaido, Japan in the North‐Western Pacific

Ando,

Yokoyama,

Miyairi

et al. 2024

Ecology and Evolution

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Natural 14C abundances and stable isotopes suggest discrete uptake routes for carbon and nitrogen in cold seep animals

Nomaki,

Kojima,

Miyairi

et al. 2024

Prog Earth Planet Sci

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Cold seeps, where geofluids containing methane and other hydrocarbons originating from the subseafloor seeps through the sediment surface, play important roles in the elemental and energy flux between sediment and seawater. These seep sites often harbor communities of endemic animals supported by chemolithoautotrophic bacteria, either through symbiosis or feeding. Despite these animal communities being intensively studied since their discovery in the 1980’s, the contribution of carbon from seep fluid to symbiotic microbes and subsequently host animals remains unclear. Here, we used natural-abundance radiocarbon to discern carbon sources: the ambient bottom water or the seeping geofluid. The 14C concentrations were measured for vesicomyid clams, a parasitic calamyzine polychaete, and a siboglinid tubeworm species from four different cold seep sites around Japan. We found most vesicomyid clams exhibiting 14C concentrations slightly lower than that of the ambient bottom water, suggesting up to 9% of C for chemolithoautotrophy originates from geofluid DIC. The different extent of fluid contribution across species may be explained by different routes to incorporate DIC and/or different DIC concentrations in the geofluid at each seep site. Stable nitrogen isotopic compositions further suggested N incorporation from geofluids in these clams, where the burrowing depth may be a key factor in determining their δ15N values. The siboglinid tubeworm showed a clear dependency for geofluid DIC, with a contribution of > 40%. Our results demonstrate the effectiveness of 14C analyses for elucidating the nutritional ecology of cold seep animals and their symbionts, as was previously shown for hydrothermal vent ecosystems.

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First dataset of dissolved inorganic radiocarbon in the Tokara Strait

Cited by 2 publications

References 29 publications

Otolith radiocarbon signatures provide distinct migration history of walleye pollock around Hokkaido, Japan in the North‐Western Pacific

Otolith radiocarbon signatures provide distinct migration history of walleye pollock around Hokkaido, Japan in the North‐Western Pacific

Natural 14C abundances and stable isotopes suggest discrete uptake routes for carbon and nitrogen in cold seep animals

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