open access

https://hdl.handle.net/2115/86200

Marine biodiversity refugia in a climate-sensitive subarctic shelf

英語

temporal beta diversity

2021-07-01

John Wiley & Sons

Global change biology

27(14)

3299-3311

The subarctic shelf of the Eastern Bering Sea (EBS) is one of the world's most productive marine environments, exposed to drastic climate changes characterized by extreme fluctuations in temperature, sea ice concentration, timing, and duration. These climatic changes elicit profound responses in species distribution, abundance, and community composition. Here, we examined the patterns of alpha and temporal beta diversity of 159 marine taxa (66 vertebrates and 93 invertebrate species) from 29 years (1990-2018) of species observations from the NOAA bottom trawl surveys in the EBS. Based on these data, we identified geographically distinct refugial zones in the northern and southern regions of the middle shelf, defined by high species richness and similarity in community species composition over time. These refugial zones harbor higher frequencies of occurrence for representative taxa relative to the regions outside of refugia. We also explored the primary environmental factors structuring marine biodiversity distributions, which underpinned the importance of the winter sea ice concentration to alpha and temporal beta diversity. The spatial biodiversity distributions between high and low winter sea ice regimes highlighted contrasting signals. In particular, the latter showed elevated species richness compared to the former. Further, the temporal beta diversity between the high and low winter sea ice periods underpinned an overall increase in the compositional similarity of marine communities in the EBS. Despite these spatiotemporal differences in biodiversity distributions, the identified refugia represent safe havens of marine biodiversity in the EBS. Distinguishing these areas can help facilitate conservation and management efforts under accelerated and ongoing climatic changes.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: [Alabia, I.D., García Molinos, J., Hirata, T., Mueter, F.J., Hirawake, T. and Saitoh, S.-I. (2021), Marine biodiversity refugia in a climate-sensitive subarctic shelf. Glob Change Biol, 27: 3299-3311.], which has been published in final form at [https://doi.org/10.1111/gcb.15632]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

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