Skeletal development in Acropora cervicornis: 1. Patterns of calcium carbonate accretion in the axial corallite.
Skeletal development in Acropora cervicornis: 1. Patterns of calcium carbonate accretion in the axial corallite.
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DOI：
10.1007/bf00286539
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发表时间：
1982-01-01
期刊：
影响因子：
3.5
通讯作者：
Gladfelter, E.H.
中科院分区：
文献类型：
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作者：
Gladfelter, E.H.
利用扫描电镜和连续岩石薄片研究了穿孔珊瑚（Acropora cervicornis）的骨骼伸长和矿化。轴向珊瑚岩通过形成随机取向的纺锤状晶体而延伸，这些晶体沉积在其远端边缘。文石针状晶体从这些梭形晶体的表面沿随机方向生长。只有那些向calcaloblastic上皮方向生长的针状晶体（即生长轴垂直于calcaloblastic细胞膜平面的晶体）继续伸长。这些生长的晶体群连接在一起形成明确的束状肌，构成了包括隔膜的主要骨骼元素。所得到的骨架是高度多孔的，所有表面都被连续的成钙细胞上皮覆盖。这个细胞层被薄的中胶层从沿高度分叉的肠肠排列的有鞭毛的胃真皮中分离出来。骨架的孔隙度和渗透性随距离尖端的远近而减小。由于筋膜束中加入文石，筋膜束的边界随着通道中充满碳酸钙而变得不那么明显，因此密度相应增加。
Scanning electron microscopy and serial petrographic thin sections were used to investigate skeletal elongation and mineralization in the perforate coral,Acropora cervicornis. The axial corallite extends by the formation of randomly oriented fusiform crystals which are deposited on its distal edge. Aragonitic needle-like crystals grow in random directions from the surface of these fusiform crystals. Only those needle-like crystals growing toward the calicoblastic epithelium (i.e. crystals whose growth axis is perpendicular to the plane of the calicoblastic cell membrane) continue to elongate. Groups of these growing crystals join to form well-defined fasciculi which make up the primary skeletal elements comprising the septotheca. The resulting skeleton is highly porous with all surfaces covered by the continuous calicoblastic epithelium. This cell layer is separated by thin mesoglea from the flagellated gastrodermis which lines the highly ramified coelenteron. Porosity and permeability of the skeleton decrease with distance from the tip. Density correspondingly increases due to the addition of aragonite to the fasciculi whose boundaries become less distinct as channels fill with calcium carbonate.