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首页> 外文期刊>Marine ecology progress series >Decreased light availability can amplify negative impacts of ocean acidification on calcifying coral reef organisms
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Decreased light availability can amplify negative impacts of ocean acidification on calcifying coral reef organisms

机译：可用光的减少会放大海洋酸化对钙化珊瑚礁生物的负面影响

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摘要

Coral reef organisms are increasingly and simultaneously affected by global and local stressors such as ocean acidification (OA) and reduced light availability. However, knowledge of the interplay between OA and light availability is scarce. We exposed 2 calcifying coral reef species (the scleractinian coral Acropora millepora and the green alga Halimeda opuntia) to combinations of ambient and increased pCO(2) (427 and 1073 mu atm, respectively), and 2 light intensities (35 and 150 mu mol photons m(-2) s(-1)) for 16 d. We evaluated the individual and combined effects of these 2 stressors on weight increase, calcification rates, O-2 fluxes and chlorophyll a content for the species investigated. Weight increase of A. millepora was significantly reduced by OA (48%) and low light intensity (96%) compared to controls. While OA did not affect coral calcification in the light, it decreased calcification in the dark by 155%, leading to dissolution of the skeleton. H. opuntia weight increase was not affected by OA, but decreased (40%) at low light. OA did not affect algae calcification in the light, but decreased calcification in the dark by 164%, leading to dissolution. Low light significantly reduced gross photosynthesis (56 and 57%), net photosynthesis (62 and 60%) and respiration (43 and 48%) of A. millepora and H. opuntia, respectively. In contrast to A. millepora, H. opuntia significantly increased chlorophyll content by 15% over the course of the experiment. No interactive effects of OA and low light intensity were found on any response variable for either organism. However, A. millepora exhibited additive effects of OA and low light, while H. opuntia was only affected by low light. Thus, this study suggests that negative effects of low light and OA are additive on corals, which may have implications for management of river discharge into coastal coral reefs.
机译：珊瑚礁生物正越来越多地同时受到全球和局部压力源的影响，例如海洋酸化（OA）和光利用率的下降。但是，缺乏关于OA和光可用性之间相互作用的知识。我们将2种钙化珊瑚礁物种（巩膜珊瑚Acropora millepora和绿藻Halimeda opuntia）暴露于环境和增加的pCO（2）（分别为427和1073 mu atm）和2个光照强度（35和150 mu mol）的组合下光子m（-2）s（-1））持续16 d。我们评估了这两种应激因素对所研究物种的体重增加，钙化速率，O-2通量和叶绿素a含量的个体和综合影响。与对照组相比，OA（48％）和低光照强度（96％）显着降低了米曲霉的体重增加。 OA在光照下不影响珊瑚钙化，但在黑暗中却使钙化降低了155％，导致骨骼溶解。 H.仙人掌的体重增加不受OA影响，但在弱光条件下减少（40％）。 OA在光照条件下不影响藻类钙化，但在黑暗条件下降低164％，导致溶解。弱光显着降低了米曲霉和仙人掌的总光合作用（56％和57％），净光合作用（62％和60％）和呼吸（43％和48％）。与A. millepora相比，H。opuntia在实验过程中将叶绿素含量显着提高了15％。在这两种生物的任何反应变量上均未发现OA和低光强度的相互作用。但是，千足莲表现出OA和弱光的累加效应，而H. opuntia仅受弱光影响。因此，这项研究表明，弱光和OA的负面影响会加重珊瑚，这可能对河流向沿海珊瑚礁的排放的管理产生影响。

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  • 来源
    《Marine ecology progress series》 |2015年第17期|49-61|共13页
  • 作者

    Vogel N.; Meyer F. W.; Wild C.; Uthicke S.;

  • 作者单位

    Australian Inst Marine Sci, Townsville, Qld 4810, Australia|Leibniz Ctr Trop Marine Ecol, D-28359 Bremen, Germany|Univ Bremen, Fac Biol & Chem FB 2, D-28359 Bremen, Germany;

    Leibniz Ctr Trop Marine Ecol, D-28359 Bremen, Germany|Univ Bremen, Fac Biol & Chem FB 2, D-28359 Bremen, Germany;

    Leibniz Ctr Trop Marine Ecol, D-28359 Bremen, Germany|Univ Bremen, Fac Biol & Chem FB 2, D-28359 Bremen, Germany;

    Australian Inst Marine Sci, Townsville, Qld 4810, Australia;

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  • 正文语种 eng
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  • 关键词

    pH; Turbidity; Calcification; Dissolution; Photosynthesis; Corals; Algae; Acropora millepora; Halimeda opuntia;

    机译：pH;浊度;钙化;溶解度;光合作用;珊瑚;藻类;千足纲;哈利木仙人掌;

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