Regularity in budding mode and resultant growth morphology of the azooxanthellate colonial scleractinian Cyathelia axillaris: effective and adaptive ways of utilizing habitat resources
Regularity in budding mode and resultant growth morphology of the azooxanthellate colonial scleractinian Cyathelia axillaris: effective and adaptive ways of utilizing habitat resources
复制标题
DOI：
10.2517/1342-8144-16.3.252
复制
发表时间：
2012-09-30
影响因子：
0.9
通讯作者：
Ezaki, Yoichi
中科院分区：
文献类型：
--
作者：
Sentoku, Asuka;Ezaki, Yoichi
偶氮黄藻珊瑚物种通过自身获取营养，保持其独立于其他物种的群体生长形式。本研究探讨了丛生的，azooxanthellate scleractinian oculinid腋生杯孢的出芽规律，以确定殖民地形成的发展限制和殖民形式的生态意义。C. axillaris通过重复的二歧分枝发展其灌木状形态，没有明显的轴向珊瑚。其出芽过程为：（1）在大多数情况下，两个芽同时发生在中间缢缩的珊瑚的两侧，靠近两个亲本的二级隔膜，（2）侧珊瑚的两个定向隔膜几乎垂直于直接亲本的定向隔膜，（3）侧珊瑚的生长方向大致呈对角向上;（4）从母珊瑚到衍生侧珊瑚，这些结果在整个生长过程中都是有效的。因此，显然复杂的，三维殖民地与众多的偏移形成根据一定的规则，无论个别珊瑚的一代。严格的发育限制和无性繁殖的细微变化极大地影响了C.腋生植物，对于腋生植物而言，芽生是利用有限资源的有效和适应性方式（即，生长空间和养分）。
Azooxanthellate coral species obtain nutrients by themselves, retaining their colonial growth forms independently of other species. This study examines the regularity of budding in the bushy, azooxanthellate scleractinian oculinid Cyathelia axillaris in order to identify the developmental constraints on colony formation and the ecological significance of colonial forms. The sympodial form of C. axillaris develops its bushy morphology by repeated dichotomous branching without clear axial corallites. The regularities in budding process are as follows: (1) in most cases, two buds originate simultaneously on opposite sides of medially constricted corallites near two parental second-order septa at individual distal ends; (2) the two directive septa of lateral corallites are oriented almost perpendicular to the directive septa of the immediate parental corallites; (3) the lateral corallites grow more or less diagonally upwards; and (4) these regularities remain valid from parental to derived lateral corallites throughout growth. Thus, apparently complex, three-dimensional colonies with numerous offsets are formed according to certain rules, irrespective of the generation of individual corallites. The strict developmental constraints and the subtle modifications on asexual reproduction greatly affect the colonial growth that is unique to C. axillaris, for which the regularities in budding are effective and adaptive ways of utilizing limited resources (i.e., growth spaces and nutrients).