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<p>Climate change is impacting marine organisms and ecosystems causing ocean warming, increased precipitation, and greater frequency and intensity of extreme weather events such as marine heatwaves (MHW). These climate impacts are becoming more frequent along the south-eastern Australia coast which is a climate change hot spot, and the centre of distribution of the Sydney rock oyster, <i>Saccostrea glomerata</i>. Potential loss of this foundational habitat forming species due to climate stress is concerning from an ecological and economic perspective. We determined the impact of abrupt and gradual MHW and reduced salinity conditions on the survival and growth of juvenile stage (spat) <i>S. glomerata</i>. Survival and growth were measured after exposing spat to a simulated abrupt and gradual MHW (24–36&#xa0;°C over 27&#xa0;days) and decreased salinity. To simulate a MHW an orthogonal experimental design in a temperature block was used. There was greater survival, but not growth of spat exposed to a gradual rather than an abrupt increase to 36&#xa0;°C. When a gradual MHW was combined with reduced salinity there was greater mortality at high temperatures and low salinities (15 &amp; 10&#xa0;ppt) compared to higher salinities (25 &amp; 35&#xa0;ppt). The results of this study indicate that survival of <i>S. glomerata</i> juveniles will be impacted more by rapidly increasing temperatures associated with an abrupt MHW compared to more gradual increases in temperature, however, this benefit to survival at extreme temperatures did not translate to growth. Overall, predicted future increased frequency and intensity of MHWs and storm events will decrease survival and potentially erode resilience.</p>

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Responses of Sydney rock oyster juveniles vary with marine heatwaves and freshening

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月10日

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  • Jasmine Glencross,
  • Elliot Scanes,
  • Maria Byrne,
  • Pauline M. Ross

摘要

Climate change is impacting marine organisms and ecosystems causing ocean warming, increased precipitation, and greater frequency and intensity of extreme weather events such as marine heatwaves (MHW). These climate impacts are becoming more frequent along the south-eastern Australia coast which is a climate change hot spot, and the centre of distribution of the Sydney rock oyster, Saccostrea glomerata. Potential loss of this foundational habitat forming species due to climate stress is concerning from an ecological and economic perspective. We determined the impact of abrupt and gradual MHW and reduced salinity conditions on the survival and growth of juvenile stage (spat) S. glomerata. Survival and growth were measured after exposing spat to a simulated abrupt and gradual MHW (24–36 °C over 27 days) and decreased salinity. To simulate a MHW an orthogonal experimental design in a temperature block was used. There was greater survival, but not growth of spat exposed to a gradual rather than an abrupt increase to 36 °C. When a gradual MHW was combined with reduced salinity there was greater mortality at high temperatures and low salinities (15 & 10 ppt) compared to higher salinities (25 & 35 ppt). The results of this study indicate that survival of S. glomerata juveniles will be impacted more by rapidly increasing temperatures associated with an abrupt MHW compared to more gradual increases in temperature, however, this benefit to survival at extreme temperatures did not translate to growth. Overall, predicted future increased frequency and intensity of MHWs and storm events will decrease survival and potentially erode resilience.