No habitat correlation of zooxanthellae in the coral genus Madracis on a Curacao reef
No habitat correlation of zooxanthellae in the coral genus Madracis on a Curacao reef
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DOI：
10.3354/meps227221
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发表时间：
2002-01-01
影响因子：
2.5
通讯作者：
Olsen, JL
中科院分区：
文献类型：
--
作者：
Diekmann, OE;Bak, RPM;Olsen, JL
共生甲藻属的共生甲藻在荷属安的列斯群岛库拉考的浮标I研究礁中，我们研究了5种Madracis的虫黄藻的多样性和深度分布。在早期研究的基础上，我们研究了核rDNA D1和D2结构域的长度和序列变异，Madracis-associated zooxanthropium的大亚基（LSU）。RFLP和序列比较表明，所有5 Madracis morphospecies主机属于系统发育组B sensu Rowan的一种类型的共生藻。虫黄藻与栖息地深度之间没有相关性，浮标I所有Madracis形态种中的B型虫黄藻（以及来自加勒比海其他3个地理位置）表明，“多面手”虫黄藻-珊瑚群丛在一系列生境中同样成功，对不同光照和营养状况的适应不一定取决于虫黄藻类型的混合，在Montastraea annularis复合体和鹿角鹿角珊瑚中，研究充分，已显示出随深度的分带性。对目前有关石珊瑚虫虫黄藻多样性的文献（包括一些物种的生物地理学采样）进行了回顾，结果表明，大多数物种似乎只有1种虫黄藻类型，3种共生甲藻（A、B、C）在所有深度都有发现，因此可能总是可供收购。
Symbiotic dinoflagellates belonging to the genus Symbiodinium (zooxanthellae) play an important role in ecological specialization and physiological adaptation in corals, We examined the diversity and depth distribution of zooxanthellae in 5 morphospecies of Madracis at the Buoy I study-reef on Curacao, Netherlands Antilles, Following earlier studies, we examined length and sequence variation in the D1 and D2 domains of the nuclear rDNA, large subunit (LSU) of Madracis-associated zooxanthellae. Both RFLP and sequence comparisons showed that all 5 Madracis morphospecies host a single type of Symbiodinium belonging to phylogenetic Group B sensu Rowan. No correlation was found between zooxanthellae and habitat depth, The presence of the single, Type-B zooxanthellae in all Madracis morphospecies at Buoy I (and from 3 other biogeographic locations in the Caribbean) suggests that 'generalist' zooxanthellae-coral associations are equally successful over a range of habitats and that adaptations to different light and nutrient regimes are not necessarily dependent on the mix of zooxanthellae types or zonation with depth, as has been shown in the well-studied Montastraea annularis complex and Acropora cervicornis. A review of the current literature on zooxanthellae diversity in scleractinians (including biogeographic sampling for some species) shows that most species appear to harbor only 1 zooxanthellae type and that the 3 types of Symbiodinium (A, B, C sensu Rowan) are found at all depths and are thus potentially always available for acquisition.