ON THE NATURE AND CAUSES OF DENSITY BANDING IN MASSIVE CORAL SKELETONS
ON THE NATURE AND CAUSES OF DENSITY BANDING IN MASSIVE CORAL SKELETONS
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DOI：
10.1016/0022-0981(93)90186-r
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发表时间：
1993-01-01
影响因子：
2
通讯作者：
LOUGH, JM
中科院分区：
文献类型：
--
作者：
BARNES, DJ;LOUGH, JM
通过将生长骨骼的重要染色与密度带特征、分离间隔和骨骼被组织占据的深度的测量结果联系起来，开发了大量孔隙岩菌落中骨骼密度带形成的机械描述。密度带的形成有三个生长过程。首先，在蚁群的外表面添加新的骨架。第二，通过组织层的深度使现有骨骼增厚（组织通常占据过去4-13个月形成的骨骼）。第三，密度模式被大约每30天发生一次的组织层下边缘的周期性和突然隆起所改变。隆起与新分离的形成有关，并在组织层的下边缘产生细密度带。在组织层内形成不太规则的细带，这可能是群落表面钙化变化的结果。骨骼片的x线摄影压缩并结合了这些机制的结果，使得很难区分单个机制对整体x线图像的贡献。这三种机制——延伸、增厚和组织隆起——对整体骨骼生长的相对重要性可能在个体菌落之间有所不同。这些机制运作和结合方式的变化可能解释了关于珊瑚密度带的广泛不同的报告。
A mechanistic account of skeletal density band formation in massive colonies of Porites is developed by linking observations from vital staining of growing skeletons with measurements of density band characteristics, dissepiment spacing and the depth to which skeleton was occupied by tissue. Three growth processes contribute to density band formation. First, addition of new skeleton at the outer surface of the colony. Second, thickening of existing skeleton through the depth of the tissue layer (tissue usually occupies skeleton formed over the last 4-13 months). Third, the density pattern is then modified by periodic and abrupt uplift of the lower margin of the tissue layer which occurs about every 30 days. Uplift is associated with formation of new dissepiments and produces a fine density band at the lower margin of the tissue layer. Less regular, fine bands are formed within the tissue layer probably as a result of variations in calcification at the colonial surface. X-radiography of skeletal slices compresses and combines the results of these mechanisms making it difficult to distinguish the contribution of individual mechanisms to the overall X-ray image. The relative importance of the three mechanisms - extension, thickening and tissue uplift - to overall skeletal growth may differ between individual colonies. Variability in the way the mechanisms operate and combine may account for widely differing reports of coral density banding.