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Thermal moderation of the intertidal zone by seaweed canopies in winter

机译：冬季海藻冠层对潮间带的热调节

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摘要

Canopy-forming seaweeds are important foundation species or ecosystem engineers in intertidal habitats. By limiting a variety of abiotic stresses during low tides, algal canopies improve the performance of many understory organisms. The reduction of heat stress through substrate shading and moisture retention has received considerable attention in marine biology. However, the thermal influence of canopies during winter has not been empirically evaluated. Using intertidal fucoid canopies (Ascophyllum nodosum) from Atlantic Canada, we did a field experiment contrasting canopy-covered and no-canopy areas to test the hypothesis that canopies limit low temperatures during winter low tides. During 35 days between January and March, mid-intertidal temperature was often negative near the time of the lowest daily tides, on average more than 1 degrees C lower on bare substrate than under full canopy cover. The difference between both canopy treatments was higher around spring tides than around neap tides. Temperature on bare substrate was once even up to 10 degrees C lower than under a full canopy. Previous studies have shown that single occurrences of lethal negative temperatures and frequent occurrences of sublethal temperatures kill intertidal organisms every winter. Thus, our study suggests that, in addition to their bioprotective role during summer, canopy-forming seaweeds might also play a relevant facilitative role during winter.
机译：形成冠层的海藻是潮间带生境中重要的基础物种或生态系统工程师。通过限制在退潮期间的各种非生物胁迫，藻类冠层可改善许多林下生物的性能。通过底物遮光和水分保留来降低热应力已在海洋生物学中引起了广泛关注。然而，尚未凭经验评估冬季冠层的热影响。我们使用来自加拿大大西洋的潮间类岩藻冠层（Ascophyllum nodosum）进行了田间试验，对比了被冠层覆盖的区域和没有冠层的区域，以检验在冬季退潮期间冠层限制低温的假说。在1月至3月的35天内，潮间带中部温度通常在每日潮汐最低时附近为负，裸露底材的平均气温比全冠遮盖的平均温度低1摄氏度以上。在春季潮汐附近，两种冠层处理方法之间的差异要大于在潮汐潮附近。裸露的基材上的温度曾经比全顶棚下的温度还要低10摄氏度。先前的研究表明，致命的负温度的单一发生和亚致死温度的频繁发生，每年冬天都会杀死潮间带生物。因此，我们的研究表明，形成冠层的海藻除了在夏季具有生物保护作用外，在冬季也可能起着相关的促进作用。

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  • 来源
    《Marine biology》 |2018年第7期|115.1-115.5|共5页
  • 作者

    Scrosati Ricardo A.; Ellrich Julius A.;

  • 作者单位

    St Francis Xavier Univ, Dept Biol, Antigonish, NS B2G 2W5, Canada;

    St Francis Xavier Univ, Dept Biol, Antigonish, NS B2G 2W5, Canada;

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