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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Ocean acidification reduces net calcification and wound healing in the tropical crustose coralline alga, Porolithon onkodes (Corallinales, Rhodophyta)
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Ocean acidification reduces net calcification and wound healing in the tropical crustose coralline alga, Porolithon onkodes (Corallinales, Rhodophyta)

机译：海洋酸化会减少热带地壳珊瑚藻藻Porolithon onkodes（Corallinales，Rhodophyta）的净钙化和伤口愈合。

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Reef dwelling algae employ a variety of physical and chemical defenses against herbivory, and the response to wounding is extremely important in algal communities. Wound healing mechanisms in crustose coralline algae (CCA) are related to skeletal growth and net calcification rate. Ocean acidification (OA) is known to affect rates of net calcification in a number of calcifying organisms, including CCA. Reduced rates of net calcification in CCA are likely to alter wound healing, and thus affect the consequences of herbivore-CCA interactions on coral reefs. The response of the tropical CCA Porolithon onkodes to OA and artificial wounding was quantified in a 51-day laboratory experiment. Eight artificially wounded (cut to a mean depth of 182 mu m) and eight non-wounded samples of P. onkodes were randomly placed into each of four treatments (n = 64 samples total). Each treatment was maintained at a different pCO(2) level representative of either ambient conditions or end-of-the-century, predicted conditions (IPCC, 2014); 429.31 +/- 20.84 (ambient), 636.54 +/- 27.29 (RCP4.5), 827.33 +/- 38.51 (RCP6.0), and 1179.39 +/- 88.85 mu atm (RCP8.5; mean +/- standard error). Elevated pCO(2) significantly reduced rates of net calcification in both wounded and non-wounded samples of P. onkodes (slopes = -6.4 x 10(-4) and - 5.5 x 10(-4) mg cm(-2) d(-1) per mu atm pCO(2), respectively over 51 days). There also was a significant reduction in the rate of vertical regeneration of thallus tissue within the wounds as pCO(2) increased (slope = -1.5 x 10(-3) mu m d(-1) per mu atm pCO(2) over 51 days). This study provides evidence that elevated pCO(2) could reduce the ability of this important alga to recover from wounding. Because wounding by herbivores plays an important role in determining CCA community structure, we propose reduced wound healing as a mechanism by which OA might affect the structure and functional roles of CCA communities on coral reefs.
机译：珊瑚礁藻类对草食动物具有多种物理和化学防御作用，对伤害的反应在藻类群落中极为重要。 c壳珊瑚藻（CCA）的伤口愈合机制与骨骼生长和净钙化率有关。已知海洋酸化（OA）会影响许多钙化生物（包括CCA）中的净钙化速率。 CCA中净钙化率降低可能会改变伤口愈合，从而影响草食动物与CCA相互作用对珊瑚礁的影响。在一个为期51天的实验室实验中，对热带CCA Porolithon onkodes对OA和人工受伤的反应进行了量化。将八个人工受伤（切至平均深度为182μm）和八个未受伤的on。p。onkodes样品随机放入四个处理中的每一个中（总共= 64个样品）。每种处理均维持在代表环境条件或本世纪末预测条件的不同pCO（2）水平上（IPCC，2014年）； 429.31 +/- 20.84（环境），636.54 +/- 27.29（RCP4.5），827.33 +/- 38.51（RCP6.0）和1179.39 +/- 88.85μatm（RCP8.5;平均值+/-标准误差）。 pCO（2）升高可显着降低on.p. onkodes受伤和未受伤样品的净钙化率（斜率= -6.4 x 10（-4）和-5.5 x 10（-4）mg cm（-2）d （-1）每亩atm pCO（2），分别超过51天）。随着pCO（2）的增加，伤口内th膜组织的垂直再生速率也显着降低（坡度= -1.5 x 10（-3）mu md（-1）每亩atm pCO（2）超过51天）。这项研究提供的证据表明，升高的pCO（2）可能会降低这种重要藻类从创伤中恢复的能力。由于食草动物的伤害在决定CCA群落结构中起着重要作用，因此我们提出减少伤口愈合是OA可能影响CCA群落在珊瑚礁上的结构和功能作用的机制。

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