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    Local Extinction of Bull Kelp (Durvillaea spp.) Due to a Marine Heatwave (2019)

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    Type of Content
    Journal Article
    UC Permalink
    http://hdl.handle.net/10092/16825
    
    Publisher's DOI/URI
    https://doi.org/10.3389/fmars.2019.00084
    
    Publisher
    Frontiers Media SA
    ISSN
    2296-7745
    Collections
    • Science: Journal Articles [1106]
    Authors
    Thomsen MS
    Mondardini L
    Alestra T
    Gerrity S
    Tait L
    South PM
    Lilley SA
    Schiel DR
    show all
    Abstract

    Detailed research has documented gradual changes to biological communities attributed to increases in global average temperatures. However, localized and abrupt temperature anomalies associated with heatwaves may cause more rapid biological changes. We analyzed temperature data from the South Island of New Zealand and investigated whether the hot summer of 2017/18 affected species of bull kelp, Durvillaea antarctica, D. poha, and D. willana. Durvillaea spp. are large iconic seaweeds that inhabit the low intertidal zone of exposed coastlines, where they underpin biodiversity and ecosystem functioning. Sea surface temperatures (SST) during the summer of 2017/18 included the strongest marine heatwaves recorded in 38 years of existing oceanic satellite data for this region. Air temperatures were also high, and, coupled with small wave heights, resulted in strong desiccation stress during daytime low tides. BeforeAfter analysis of drone images of four reef platforms (42, 42, 44, and 45◦S) was used to evaluate changes to bull kelp over the hot summer. Bull kelp loss varied among species and reefs, with the greatest (100%) loss of D. poha at Pile Bay in Lyttelton Harbor (44◦S). In Pile Bay, SST exceeded 23◦C and air temperatures exceeded 30◦C, while Durvillaea was exposed for up to 3 h per day during low tide. Follow-up surveys showed that all bull kelps were eliminated from Pile Bay, and from all reefs within and immediately outside of Lyttelton Harbor. Following the localized extinction of bull kelp in Pile Bay, the invasive kelp Undaria pinnatifida recruited in high densities (average of 120 m−2 ). We conclude that bull kelps are likely to experience additional mortalities in the future because heatwaves are predicted to increase in magnitude and durations. Losses of the endemic D. poha are particularly concerning due to its narrow distributional range.

    Citation
    Thomsen MS, Mondardini L, Alestra T, Gerrity S, Tait L, South PM, Lilley SA, Schiel DR (2019). Local Extinction of Bull Kelp (Durvillaea spp.) Due to a Marine Heatwave. FRONTIERS IN MARINE SCIENCE. 6.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    Keywords
    canopy forming seaweed; temperature anomaly; marine heatwave; extinction; endemic species; foundation species
    ANZSRC Fields of Research
    04 - Earth Sciences::0401 - Atmospheric Sciences::040105 - Climatology (excl. Climate Change Processes)
    37 - Earth sciences::3708 - Oceanography::370801 - Biological oceanography
    31 - Biological sciences::3108 - Plant biology::310801 - Phycology (incl. marine grasses)
    Rights
    This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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