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Antarctic crustacean grazer assemblages exhibit resistance following exposure to decreased pH

机译：暴露于降低的pH值后，南极甲壳动物放牧者组合表现出抗性

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Anthropogenic atmospheric CO2 concentrations are increasing rapidly, resulting in declining seawater pH (ocean acidification). The majority of ocean acidification research to date has focused on the effects of decreased pH in single-species experiments. To assess how decreased pH may influence natural macroalgal-grazer assemblages, we conducted a mesocosm experiment with the common, chemically defended Antarctic brown macroalga Desmarestia menziesii and natural densities of its associated grazer assemblage, predominantly amphipods. Grazer assemblages were collected from the immediate vicinity of Palmer Station (64 degrees 46'S, 64 degrees 03'W) in March 2013. Assemblages were exposed for 30 days to three levels of pH representing present-day mean summer ambient conditions (pH 8.0), predicted near-future conditions (2100, pH 7.7), and distant-future conditions (pH 7.3). A significant difference was observed in the composition of mesograzer assemblages in the lowest pH treatment (pH 7.3). The differences between assemblages exposed to pH 7.3 and those maintained in the other two treatments were driven primarily by decreases in the abundance of the amphipod Metaleptamphopus pectinatus with decreasing pH, reduced copepod abundance at pH 7.7, and elevated ostracod abundance at pH 7.7. Generally, the assemblages maintained at pH 7.7 were not significantly different from those at ambient pH, demonstrating resistance to short-term decreased pH. The relatively high prevalence of generalist amphipods may have contributed to a net stabilizing effect on the assemblages exposed to decreased pH. Overall, our results suggest that crustacean grazer assemblages associated with D. menziesii, the dominant brown macroalgal species of the western Antarctic Peninsula, may be resistant to short-term near-future decreases in seawater pH.
机译：人为的大气中二氧化碳浓度迅速增加，导致海水pH值下降（海洋酸化）。迄今为止，大多数海洋酸化研究都集中在单一物种实验中pH降低的影响上。为了评估pH值降低如何影响天然大型藻类-放牧者组合，我们对常见的，化学防御过的南极棕色大型藻类Desmarestia menziesii及其相关的随机放牧者组合（主要是两栖类）的自然密度进行了介观试验。 2013年3月，从Palmer站附近（64度46'S，64度03'W）附近收集了Grazer组件。将这些组件暴露在代表当前平均夏季环境条件（pH 8.0）的三个pH值下30天。预测的近期条件（2100，pH 7.7）和遥远的条件（pH 7.3）。在最低的pH处理（pH 7.3）下，观察到中型放牧器组合物的组成存在显着差异。暴露于pH 7.3的组合与其他两种处理所保持的组合之间的差异主要是由于两栖类金属双歧杆菌pectinatus的丰度随pH降低而降低，co足类的丰度在pH 7.7降低，以及足类的丰度在pH 7.7升高所致。通常，在pH 7.7下保持的组合与在环境pH下保持的组合没有显着差异，表明对短期降低的pH具有抵抗力。多用途两足动物的相对较高的流行率可能对暴露于pH降低的组合物产生了净稳定作用。总体而言，我们的结果表明，与南极半岛西部占主导地位的棕色大型藻类D. menziesii相关的甲壳类动物放牧组合可能对短期内海水pH近期下降具有抵抗力。

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  • 来源
    《Marine biology》 |2016年第5期|106.1-106.12|共12页
  • 作者

    Schram Julie B.; Amsler Margaret O.; Amsler Charles D.; Schoenrock Kathryn M.; McClintock James B.; Angus Robert A.;

  • 作者单位

    Univ Alabama Birmingham, Dept Biol, Birmingham, AL 35294 USA|Univ Oregon, Oregon Inst Marine Biol, 63466 Boat Basin Rd, Charleston, OR 97420 USA;

    Univ Alabama Birmingham, Dept Biol, Birmingham, AL 35294 USA;

    Univ Alabama Birmingham, Dept Biol, Birmingham, AL 35294 USA;

    Univ Alabama Birmingham, Dept Biol, Birmingham, AL 35294 USA;

    Univ Alabama Birmingham, Dept Biol, Birmingham, AL 35294 USA;

    Univ Alabama Birmingham, Dept Biol, Birmingham, AL 35294 USA;

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