Abstract
Since iron (Fe) is an important trace nutrient for marine organisms, establishing a tracer of the Fe cycle through the food chain is crucial. Herein, we report the variation in δ56Fe in marine organisms (n = 32, nine species) collected around the Northwest Pacific Ocean. The δ56Fe value varied from −2.64‰ to −0.03‰, which is consistently lower than the reported seawater value. This variation was predominantly controlled in terms of species rather than size and region, suggesting that this proxy is useful to assessing species-specific Fe metabolic processes.
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