Taxonomic relationships in the genus Ammonia (Foraminifera) based on ribosomal DNA sequences
Taxonomic relationships in the genus Ammonia (Foraminifera) based on ribosomal DNA sequences
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DOI：
10.1144/jm.19.1.85
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发表时间：
2000-05-01
影响因子：
2
通讯作者：
Pawlowski, J
中科院分区：
文献类型：
--
作者：
Holzmann, M;Pawlowski, J
氨属是一种常见的底栖有孔虫，广泛分布于近岸海洋环境中。其较大的形态变异性给物种鉴定带来了相当大的困难。在本研究中，我们利用基于核糖体 DNA 序列的分子方法研究了氨的分类关系。我们从 88 个活氨样本中获得了 149 个部分大亚基核糖体 DNA (LSU rDNA) 序列和 23 个小亚基核糖体 DNA (SSU rDNA) 序列，这些样本采集自 14 个地点的自由生活种群。序列分析显示存在八个不同的基因型组（T1-T7、T9）和一个样本代表的一种不同的基因型（T8）。形态特征的检查表明，只有一种基因型群体可以通过其形态清楚地区分。生物地理和生态特征被用于额外的表征，似乎不同的群体生活在相对明确的环境条件下，并且只有一个基因型群体是世界性的，而其他群体的地理分布相当有限。根据我们的研究，三个基因型组可以被视为不同的物种。
The genus Ammonia is a common benthic foraminifer which is widely distributed in nearshore marine environments. Its large morphological variability causes considerable difficulties in species identification. In the present study, we investigated taxonomic relationships in Ammonia by using a molecular approach based on ribosomal DNA sequences. We obtained 149 partial large subunit ribosomal DNA (LSU rDNA) sequences and 23 small subunit ribosomal DNA (SSU rDNA) sequences from 88 living Ammonia specimens which were collected from free-living populations in 14 localities. Sequence analysis revealed the presence of eight distinct genotypic groups (T1-T7, T9) and one distinct genotype that is represented by one specimen (T8). Examination of morphological characters shows that only one genotypic group can be clearly distinguished by its morphology. Biogeographical and ecological features are used for an additional characterization and it seems that the different groups live in relatively well defined environmental conditions and that only one genotypic group is cosmopolitan, while the others have a rather restricted geographical distribution. According to our study, three of the genotypic groups can be regarded as distinct species.