Paula A F, Creed J C
Laboratório de Celenterologia, Departamento de Invertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, São Cristóvão, CEP 20940-040, Rio de Janeiro, RJ, Brazil.
Braz J Biol. 2005 Nov;65(4):661-73. doi: 10.1590/s1519-69842005000400014.
The distribution and abundance of azooxanthellate coral Tubastraea Lesson, 1829 were examined at different depths and their slope preference was measured on rocky shores on Ilha Grande, Brazil. Tubastraea is an ahermatypic scleractinian nonindigenous to Brazil, which probably arrived on a ship's hull or oil platform in the late 1980's. The exotic coral was found along a great geographic range of the Canal Central of Ilha Grande, extending over a distance of 25 km. The abundance of Tubastraea was quantified by depth, using three different sampling methods: colony density, visual estimation and intercept points (100) for percentage of cover. Tubastraea showed ample tolerance to temperature and desiccation since it was found more abundantly in very shallow waters (0.1-0.5 m), despite the fact that hard substratum is available at greater depths at all the stations sampled. At most sites, 1 to 5 colonies per 0.25 m2 were found most frequently, but occasionally more than 50 colonies were found per 0.25 m2, indicating a somewhat gregarious spatial distribution for this coral. The coral Tubastraea was found to occupy slopes of every possible angle in the Canal Central of Ilha Grande, but more colonies were found occupying slopes of 80 to 100 degrees. Therefore, its insensitivity to angles of recruitment and its tolerance for different depths makes it an organism with great ecological tolerance, with a potential to colonize new areas and increase its current range in Brazil's coastal waters.
对1829年命名的无共生藻珊瑚 Tubastraea 在不同深度的分布和丰度进行了研究，并在巴西大岛的岩石海岸测量了其对坡度的偏好。Tubastraea 是一种非巴西本土的造礁石珊瑚，可能于20世纪80年代末随船体或石油平台抵达巴西。在大岛中央运河的广阔地理范围内发现了这种外来珊瑚，分布距离达25公里。采用三种不同的采样方法，即群体密度、目视估计和截点（100）来计算覆盖百分比，以此按深度对 Tubastraea 的丰度进行量化。尽管在所有采样站的较深水域都有坚硬基质，但 Tubastraea 在非常浅的水域（0.1 - 0.5米）更为丰富，这表明它对温度和干燥具有较强的耐受性。在大多数地点，每0.25平方米最常发现1至5个群体，但偶尔每0.25平方米会发现超过50个群体，这表明这种珊瑚在空间分布上有点聚集。在大岛中央运河中，发现 Tubastraea 占据了各种可能角度的斜坡，但更多群体分布在80至100度的斜坡上。因此，它对附着角度不敏感且对不同深度具有耐受性，使其成为一种具有很强生态耐受性的生物，有在新区域定殖并扩大其在巴西沿海水域现有分布范围的潜力。
