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Historical delta(15) N records of Saccharina specimens from oligotrophic waters of Japan Sea (Hokkaido)

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Title: Historical delta(15) N records of Saccharina specimens from oligotrophic waters of Japan Sea (Hokkaido)
Authors: Kuribayashi, Takanori Browse this author
Abe, Tsuyoshi Browse this author →KAKEN DB
Montani, Shigeru Browse this author →KAKEN DB
Issue Date: 12-Jul-2017
Publisher: PLOS
Journal Title: PLoS ONE
Volume: 12
Issue: 7
Start Page: e0180760
Publisher DOI: 10.1371/journal.pone.0180760
Abstract: Historically Saccharina spp. beds occurred along the west coast of Hokkaido, an oligotrophic area, and were commercially exploited. Currently extensive commercial Saccharina spp. beds do not form due to nutrient limitations. Here, we postulate that nutrients assimilated by paleo-Saccharina spp. beds may have been derived from spawning herrings (Clupea pallasii) acting as organisms that formed a vector from their feeding grounds (Okhotsk Sea and Pacific Ocean) to their spawning area (west coast of Hokkaido, Japan Sea). To test this hypothesis we examined stable nitrogen isotope ratios (delta N-15) of 100-to 135-year-old Saccharina specimens preserved at the Herbarium (Hokkaido University Museum). delta(15) N values of the paleo-Saccharina specimens collected from this region were in the range of 10%, which is significantly higher than the current 3-7% in freshly sampled Saccharina spp. This high delta(15) N indicates that spawning herring (Clupea pallasii) had potentially been a significant source of dissolved inorganic nitrogen (DIN) absorbed by Saccharina, acting as an organism forming a vector for transporting nutrients from eutrophic to oligotrophic coastal ecosystems. Our findings support the hypothesis of so-called "herring-derived nutrients.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 門谷 茂

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