DEFINING TAXON BOUNDARIES IN MEMBERS OF THE MORPHOLOGICALLY AND GENETICALLY PLASTIC GENES CAULERPA (CAULERPALES, CHLOROPHYTA) 1
DEFINING TAXON BOUNDARIES IN MEMBERS OF THE MORPHOLOGICALLY AND GENETICALLY PLASTIC GENES CAULERPA (CAULERPALES, CHLOROPHYTA) 1
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定义形态和遗传塑料基因 Caulerpa（Caulerpales，绿藻）成员的分类边界 1
DOI：
10.1111/j.0022-3646.2003.02-203.x
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发表时间：
2003
影响因子：
2.9
通讯作者：
G. Trono
中科院分区：
文献类型：
--
作者：
Lisette N. de Senerpont Domis;P. Famá;A. J. Bartlett;W. F. Prud’homme van Reine;Cinthya Armenta Espinosa;G. Trono
许多试图捕捉蕨藻属的形态变异，导致了许多变种和变型的不稳定分类。在本研究中，我们试图测试分类群的边界，通过调查内和7个分类群之间的形态和遗传变异的蕨藻，据说属于四个物种，在不同的地点在菲律宾的珊瑚礁系统采样。使用现场和文化的观察，我们描述了一组形态特征和生态参数，如波曝光，光照强度和基板类型的变异之间的关系。统计分析表明，两个（三个）ecad之间的界限。racemosa（Forsskål）J. Agardh复合体的形态可塑性被掩盖。其他研究过的蕨藻属（Caulerpa）分类群（即C.柏属C. Agardh角serrulata [Forsskål] J. Agardh和C. sertularioides [S. Gmelin] Howe）可以基于形态进行分组，尽管存在形态可塑性。我们的研究结果表明，光强和几个定量形态变量之间的强关联。通过对叶绿体rbcL和tufA基因以及ycf 10-chlB叶绿体间隔区进行部分测序来评估这些分类群的遗传多样性。在所有的系统发育分析中，C. serrulata、细齿隐翅虫C. cupressoides、柏刺蛾C. sertularioides和C.总状花序作为独特的遗传单位出现。尽管存在形态可塑性和形态收敛，一个子集的形态特征传统上用于分类划界仍然有足够的判别力，以识别终端系统发育分支。
Numerous attempts to capture the morphological variability of the genus Caulerpa have resulted in an unstable classification of numerous varieties and formae. In the present study we attempted to test taxon boundaries by investigating morphological and genetic variation within and between seven taxa of Caulerpa, supposedly belonging to four species, sampled at different sites in a Philippine reef system. Using both field and culture observations, we described the relation between the variability of a set of morphological characters and ecological parameters, such as wave exposure, light intensity, and substrate type. Statistical analyses showed that the limits between two (out of three) ecads of the C. racemosa (Forsskål) J. Agardh complex were obscured by the presence of morphological plasticity. Other studied taxa of Caulerpa (i.e. C. cupressoides [Vahl] C. Agardh, C. serrulata [Forsskål] J. Agardh, and two formae of C. sertularioides [S. Gmelin] Howe) could be grouped based on morphology despite the presence of morphological plasticity. Our results indicated a strong association between light intensity and several quantitative morphological variables. Genetic diversity of these taxa was assessed by partial sequencing chloroplast rbcL and tufA genes and the ycf10‐chlB chloroplast spacer. In all phylogenetic analyses, C. serrulata, C. cupressoides, C. sertularioides, and the three ecads of C. racemosa emerged as distinct genetic units. Despite the presence of morphological plasticity and morphological convergence, a subset of morphological characters traditionally used in taxonomic delimitation still had sufficient discriminative power to recognize the terminal phylogenetic clades.