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首页> 外文期刊>Facies >The morphological adaptation of Lithocodium aggregatum Elliott (calcareous green alga) to cryptic microhabitats (Lower Aptian, Spain): an example of phenotypic plasticity
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The morphological adaptation of Lithocodium aggregatum Elliott (calcareous green alga) to cryptic microhabitats (Lower Aptian, Spain): an example of phenotypic plasticity

机译：碎石藻Elliott（钙质绿藻）对隐性微生境（西班牙下阿普提安）的形态学适应：表型可塑性的一个例子

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Lithocodium aggregatum Elliott is interpreted as a heterotrichale chlorophycean alga with a prostrate and erect system within a well-calcified tissue. Within Lower Aptian coral rubble of the western Maestrat Basin, Spain, it forms thick masses of juxtaposed crusts around the bioclasts. In achieving a rapid and complete encrustation of the available bioclasts, Lithocodium applied several strategies, e.g., filling voids of structured surfaces with a special fabric or forming erect extensions to bridge adjacent substrates. In these deposits, different types of poorly if ever illuminated cryptic microhabitats can be distinguished: (1) existing crypts such as empty shells or structural voids within bioclasts (2) crypts resulting from the complete encrustation of adjacent bioclasts by Lithocodium itself and (3) syndepositionally created crypts, e.g., boreholes produced by lithophagid bivalves. In these cases, Lithocodium developed a poorly calcified structure of large cells with thin microcrystalline walls indicating a high degree of variability (phenotypic plasticity). This cryptic growth stage is interpreted as an adaption to the poorly illuminated crypts (photoadaption) in order to maximize light capture for photosynthesis. The Lower Cretaceous Lithocodium is therefore not per se a cryptoendolithic microorganism, but may show adaptation to develop and survive also in these already existing or newly created niches.
机译：锂石藻Elliott被解释为杂钙藻藻藻，在钙化良好的组织中具有strate立的系统。在西班牙西部Maestrat盆地的下Aptian珊瑚瓦砾中，它在生物碎屑周围形成了密集的并列结皮。为了使可用的生物破骨细胞快速而完全地包壳，Lithocodium采用了几种策略，例如用特殊的织物填充结构化表面的空隙或形成直立的延伸物以桥接相邻的底物。在这些矿床中，可以区分出不同类型的，如果照亮的隐秘微生境：（1）存在的隐窝，例如生物破损内的空壳或结构性空洞（2）隐孢子虫自身对相邻生物破灭物的完全包裹而形成的隐窝，以及（3）隐窝形成的隐窝，例如，由卵石双壳类动物产生的钻孔。在这些情况下，锂钴矿形成的大细胞钙化结构差，微晶壁薄，表明高度的可变性（表型可塑性）。这个隐秘的生长阶段被解释为对照明不佳的隐窝的适应（光适应），以使光合作用的光捕获最大化。因此，下白垩纪石Li本身不是一种隐藻类微生物，但可能显示出适应能力，可以在这些已经存在或新近形成的生态位中发育并生存。

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