Phylogeographical structure, distribution and genetic variation of the green algae Ulva intestinalis and U-compressa (Chlorophyta) in the Baltic Sea area
Phylogeographical structure, distribution and genetic variation of the green algae Ulva intestinalis and U-compressa (Chlorophyta) in the Baltic Sea area
复制标题
DOI：
10.1111/j.1365-294x.2004.02219.x
复制
发表时间：
2004-08-01
影响因子：
4.9
通讯作者：
Pamilo, P
中科院分区：
文献类型：
--
作者：
Leskinen, E;Alström-Rapaport, C;Pamilo, P
海洋藻类石莼（Ulva）和石莼（U.扁果在形态上是可塑的，具有许多重叠的特征，因此难以彼此区分。本文介绍了美国的分布现状。美国和美国。通过对内转录间隔区（ITS）序列数据的分析，沿着波罗的海盐度梯度对compressa进行了研究。此外，在ITS区域的种内遗传多态性的数量和分布进行了研究，允许推断波罗的海地区的冰川地理格局和冰后期的冰川化。数据表明，这两种物种中只有U。波罗的海是波罗的海的一部分。美国的分布。compressa比以前报道的更受限制，在盐度低于15 ppt的地方没有发现。整个斯堪的纳维亚半岛和波罗的海在最后一个冰河时代都被冰覆盖着，波罗的海的生物一定是在冰开始融化后在该地区定居的。U.美国和美国。波罗的海和邻近地区的compressa被认为是减少相比，在不列颠群岛。这种减少可能是由于历史上多样性的减少或特定克隆适应北方环境条件的结果。
The marine algae Ulva intestinalis and U. compressa are morphologically plastic with many overlapping characters and are therefore difficult to distinguish from each other. The present distribution of U. intestinalis and U. compressa is investigated along the salinity gradient in the Baltic Sea area through analyses of internal transcribed spacer (ITS) sequence data. Also, the amount and distribution of intraspecific genetic polymorphism in the ITS region is studied allowing inferences on the phylogeographical pattern and postglacial recolonization of the Baltic Sea area. The data show that of the two species only U. intestinalis occurs in the Baltic Sea. The distribution of U. compressa is more restricted than previously reported, and it was not found in salinities lower than 15 ppt. All of Scandinavia and the Baltic Sea were covered with ice during the last ice age and the organisms in the Baltic Sea must have colonized the area after the ice had started to melt. The genetic diversity of U. intestinalis and U. compressa in the Baltic Sea and the neighbouring area was found to be reduced compared to that in the British Isles. This reduction may be the result of either a historical reduction of diversity or an adaptation of specific clones to the northern environmental conditions.