Constraints on the formation of colonies of the extant azooxanthellate scleractinian coral Dendrophyllia arbuscula
Constraints on the formation of colonies of the extant azooxanthellate scleractinian coral Dendrophyllia arbuscula
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DOI：
10.1111/j.1502-3931.2011.00293.x
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发表时间：
2012-01-01
期刊：
影响因子：
1.5
通讯作者：
Ezaki, Yoichi
中科院分区：
文献类型：
--
作者：
Sentoku, Asuka;Ezaki, Yoichi
由于内外因素的共同作用，核壳菌呈现出多种生长形态，无论是虫黄藻还是偶氮黄藻。新的模块出现在殖民珊瑚通过无性繁殖，包括萌芽和分裂。本文报道了一种新的无偶黄藻，即枝状树状珊瑚Dendrophyllia arbuscula货车der Horst 1922，它是研究芽接过程中内生孢子的一个很好的物种，因为：（1）侧生珊瑚通常出现在四个初级隔膜的附近，不包括两个定向的初级隔膜：（2）侧生珊瑚的两个定向隔膜的取向几乎垂直于亲本珊瑚的生长方向;（3）侧珊瑚或多或少地斜向上生长;（4）在群体生长过程中，从轴珊瑚到衍生的侧珊瑚，这些珊瑚被保留下来。因此，根据适用于连续几代珊瑚的某些普遍规则，形成了一个明显复杂的树状珊瑚群。两个相反的部门，其中不发生出芽的存在似乎是共同的其他azooxanthellate scleractinian家庭。规则性，除了定向隔膜的方向，也通常至少在其他偶氮黄藻dendrophylliid属中发现。这表明存在严格的发展限制无性繁殖的石珊瑚，现存的和灭绝的。这些由偶氮黄藻组成的硬珊瑚虫，作为一个具有代表性的群体后生动物类群，为我们了解群体是如何构建的提供了基础资料。
Scleractinia display a variety of growth forms, whether zooxanthellate or azooxanthellate, as the consequence of the combined effects of both intrinsic and extrinsic factors. New modules arise in colonial corals through asexual reproduction, including budding and division. The azooxanthellate, branching dendrophylliid Dendrophyllia arbuscula van der Horst 1922, is a good species to investigate intrinsic regularities in budding, because: (1) the lateral corallites always occur in the vicinity of four primary septa, excluding the two directive primary septa; (2) the two directive septa in lateral corallites tend to be oriented almost perpendicular to the growth orientation of parental corallites; (3) the lateral corallites grow more-or-less diagonally upwards; and (4) these regularities are retained from the axial to the derived lateral corallites during colony growth. Accordingly, a colony of apparently complex dendroid corals is formed according to certain universal rules that apply to successive generations of corallites. The presence of two opposite sectors in which budding do not occur seems to be common to other azooxanthellate scleractinian families. Regularities, other than the orientation of the directive septa, are also commonly found at least in other azooxanthellate dendrophylliid genera. These regularities suggest the presence of strict developmental constraints on the asexual reproduction of the Scleractinia, both extant and extinct. These regularities by azooxanthellate scleractinians, as one of the representative colonial metazoan groups, provide us with fundamental data with which we can understand how colonies are constructed.