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首页> 外文期刊>Marine biology >Growth response of an early successional assemblage of coralline algae and benthic diatoms to ocean acidification
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Growth response of an early successional assemblage of coralline algae and benthic diatoms to ocean acidification

机译：珊瑚藻和底栖硅藻的早期演替组合对海洋酸化的生长响应

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The sustained absorption of anthropogenically released atmospheric CO_2 by the oceans is modifying seawater carbonate chemistry, a process termed ocean acidification (OA). By the year 2100, the worst case scenario is a decline in the average oceanic surface seawater pH by 0.3 units to 7.75. The changing seawater carbonate chemistry is predicted to negatively affect many marine species, particularly calcifying organisms such as coralline algae, while species such as diatoms and fleshy seaweed are predicted to be little affected or may even benefit from OA. It has been hypothesized in previous work that the direct negative effects imposed on coralline algae, and the direct positive effects on fleshy seaweeds and diatoms under a future high CO_2 ocean could result in a reduced ability of corallines to compete with diatoms and fleshy seaweed for space in the future. In a 6-week laboratory experiment, we examined the effect of pH 7.60 (pH predicted to occur due to ocean acidification just beyond the year 2100) compared to pH 8.05 (present day) on the lateral growth rates of an early successional, cold-temperate species assemblage dominated by crustose coralline algae and benthic diatoms. Crustose coralline algae and benthic diatoms maintained positive growth rates in both pH treatments. The growth rates of coralline algae were three times lower at pH 7.60, and a non-significant decline in diatom growth meant that proportions of the two functional groups remained similar over the course of the experiment. Our results do not support our hypothesis that benthic diatoms will outcompete crustose coralline algae under future pH conditions. However, while crustose coralline algae were able to maintain their presence in this benthic rocky reef species assemblage, the reduced growth rates suggest that they will be less capable of recolonizing after disturbance events, which could result in reduced coralline cover under OA conditions.
机译：海洋对人为释放的大气CO_2的持续吸收正在改变海水碳酸盐的化学作用，这一过程称为海洋酸化（OA）。到2100年，最坏的情况是平均海洋表层海水pH值下降0.3个单位至7.75。海水碳酸盐化学的变化预计会对许多海洋物种产生负面影响，尤其是钙化生物，例如珊瑚藻，而硅藻和肉质海藻等物种受到的影响很小，甚至可能受益于OA。在先前的工作中已经假设，在未来高CO_2的海洋下，对珊瑚藻产生的直接负面影响以及对肉质海藻和硅藻的直接正效应可能导致珊瑚虫与硅藻和肉质海藻竞争太空的能力降低在将来。在为期6周的实验室实验中，我们检查了pH值为7.60（预计到2100年以后将由于海洋酸化而产生的pH）与pH 8.05（今天）相比对早期连续性冷水的横向生长速率的影响。温带物种组合以甲壳珊瑚藻和底栖硅藻为主。在两种pH处理中，硬壳珊瑚藻和底栖硅藻均保持正增长。在7.60的pH值下，珊瑚藻的生长速率降低了三倍，硅藻的生长无明显下降，这意味着两个官能团的比例在实验过程中保持相似。我们的结果不支持我们的假设，即在未来的pH条件下底栖硅藻将比壳藻珊瑚藻更胜一筹。然而，尽管地壳珊瑚藻能够在这种底栖岩石礁物种集合中维持其存在，但降低的生长速度表明，它们在干扰事件后将无法重新定殖，这可能导致在OA条件下珊瑚覆盖减少。

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  • 来源
    《Marine biology》 |2014年第7期|1687-1696|共10页
  • 作者

    Rebecca K. James; Christopher D. Hepburn; Christopher E. Cornwall; Christina M. McGraw; Catriona L. Hurd;

  • 作者单位

    Department of Botany, University of Otago, PO Box 56, Dunedin 9054, New Zealand;

    Department of Marine Sciences, University of Otago, PO Box 56, Dunedin 9054, New Zealand;

    Department of Botany, University of Otago, PO Box 56, Dunedin 9054, New Zealand,Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia;

    School of Science and Technology, University of New England, Armidale, NSW 2350, Australia,Department of Chemistry, University of Otago, PO Box 56, Dunedin 9054, New Zealand;

    Department of Botany, University of Otago, PO Box 56, Dunedin 9054, New Zealand,Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia;

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