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首页> 美国卫生研究院文献>Microorganisms >Adaptation of Coccomyxa sp. to Extremely Low Light Conditions Causes Deep Chlorophyll and Oxygen Maxima in Acidic Pit Lakes
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Adaptation of Coccomyxa sp. to Extremely Low Light Conditions Causes Deep Chlorophyll and Oxygen Maxima in Acidic Pit Lakes

机译：调整Coccomyxa sp。到极低的光线条件导致酸性坑湖中的深叶绿素和氧气最大值

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Deep chlorophyll maxima (DCM) and metalimnetic oxygen maxima (MOM) are outstanding biogeochemical features of acidic pit lakes (APL). However, knowledge of the eukaryotic phototrophs responsible for their formation is limited. We aimed at linking the dynamics of phototrophic communities inhabiting meromictic APL in Spain with the formation of these characteristic layers. Firstly, the dynamics of DCM and MOM and their relation to physico-chemical parameters (photosynthetically active radiation (PAR), pH, dissolved ferric iron concentration, temperature), pigments and nutrient distribution is described; secondly, the phototrophic community composition is studied through a combination of microscopy, biomolecular and “omics” tools. Phototrophic communities of the studied APL show a low diversity dominated by green microalgae, specifically sp., which have been successfully adapted to the chemically harsh conditions. DCM and MOM are usually non-coincident. DCM correspond to layers where phototrophs have higher chlorophyll content per cell to cope with extremely low PAR (<1 µmol m s ), but where photosynthetic oxygen production is limited. MOM correspond to shallower waters with more light, higher phytoplankton biomass and intense photosynthetic activity, which affects both oxygen concentration and water temperature. The main drivers of DCM formation in these APL are likely the need for nutrient uptake and photo-acclimation.
机译：深层叶绿素最大值（DCM）和金属吲哚氧氧摩西米（MOM）是酸性坑湖（APL）的出色生物地球化学特征。然而，对其形成的真核光学的了解是有限的。我们旨在将西班牙居住在西班牙居住的拍摄社区的动态联系起来，形成这些特征层。首先，描述了DCM和MOM的动态及其与物理化学参数的关系（光合作用辐射（PAR），pH，溶解的铁浓度，温度），颜料和营养分布;其次，通过微观，生物分子和“OMIC”工具的组合研究了光营养群落组合物。所研究的APL的光营养群落显示由绿色微藻的低多样性，特别是SP。​​，已经成功地调整到化学苛刻的条件下。 DCM和MOM通常是不合格的。 DCM对应于每种细胞具有更高叶绿素含量的层，以应对极低的PAR（<1μmolm s），但是在光合氧生产受限的情况下。 MOM对应于较浅的水域，具有更多的光，更高的浮游植物生物量和强烈的光合活性，这影响氧气浓度和水温。这些APL中的DCM形成的主要驱动因素可能是营养吸收和光处理的需要。

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