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首页> 外文期刊>Facies >Exploring the niche of a highly effective biocalcifier: calcification of the eukaryotic microalga Oocardium stratum Nageli 1849 in a spring stream of the Eastern Alps
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Exploring the niche of a highly effective biocalcifier: calcification of the eukaryotic microalga Oocardium stratum Nageli 1849 in a spring stream of the Eastern Alps

机译：探索高效生物陶器的利基：在东部的春季流中的真核微藻Oeocardium Stratum Nageli 1849的钙化

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摘要

Microbially mediated calcification is a major process of carbonate production, yet little is known about eukaryotic microalgal calcifiers. We describe calcification and propagation of the unicellular microalga Oocardium stratum in an Alpine spring stream. The spring sheds Ca-Mg-HCO3 water with a temperature of 8-11 degrees C. The biota is dominated by O. stratum and diatoms; mosses, cyanobacteria, and filamentous eukaryotic algae are accessories. O. stratum colonize various substrates within the stream throughout the year. When colonizing, single cells attached to mucilage, then induced precipitation of a rim of calcite, and underwent a first division. A mature clone of O. stratum typically consists of single cells each housed within a calcite tube precipitated by the microalga. Upon cell division, the tubes branch, too, under retention of the optical orientation of the calcite. Continued growth, cell division, and calcification result in laminae of Oocardium calcite (OC) concordant with substrate shape. O. stratum accelerates but seems not to control calcite precipitation. A maximum vertical calcification rate of 5mm/a was documented for a site25m downstream of the spring. Crystal-skeletal' OC characterized low calcite supersaturation, whereas higher supersaturation corresponded with rhombohedral OC. Abiotic precipitation downward of the upper tips of growing calcite tubes resulted in compact spar crystals, irrespective of initial crystal habit. Diatoms that thrived on OC benefit from a large differentiated habitat. Our study confirms previous works that identify O. stratum, not cyanobacteria, as major biocalcifiers in some hardwater springs. Diagenetically mature Oocardium tufa, however, may be confused with spring limestones of other origins.
机译：微生物介导的钙化是碳酸酯产生的主要过程，但是关于真核微藻钙化剂的众所周知。我们描述了在高山弹簧流中的单细胞微藻Oocardium stratum的钙化和繁殖。弹簧脱落Ca-Mg-HCO3水，温度为8-11℃。Biota由O. Stratum和Diatoms主导;苔藓，蓝藻和丝状真核藻类是配件。 O.层在整个年度内殖民地在流中殖民。在殖民化时，单细胞附着在粘液中，然后诱导方解石边缘的沉淀，并经历了第一分裂。成熟的O.层克隆通常由单个细胞组成，每个细胞容纳在由微藻沉淀的方解石管内。在细胞分裂时，管道也在保持方解石的光学取向之下。持续的生长，细胞分裂和钙化导致底板形状的薄膜铌铌（OC）的底层形状。 O. Stratum加速，但似乎不控制方解石降水。为弹簧下游的Site25m记录了5mm / a的最大垂直钙化速率。 Crystal-skeletal'oC表征低方解石过饱和度，而较高的过饱和度与菱形OC相对应。不管初始晶体习惯如何，生长方解石管的上尖端的非生物沉淀导致紧凑型晶状体。在oc中茁壮成长的硅藻，从一个大的差异化栖息地受益。我们的研究证实了以前的作品，以识别O. Stratum，而不是蓝藻，作为一些硬水弹簧中的主要生物钙化剂。然而，成岩性成熟的卵巢曲霉可能与其他起源的春季石灰岩混淆。

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