High levels of intra- and inter-individual polymorphism in the rDNA ITS1 of Caulerpa racemosa (Chlorophyta)

被引:47
作者
Famà, P
Olsen, JL
Stam, WT
Procaccini, G
机构
[1] Lab Ecol Benthos, Staz Zool Anton Dohrn, I-80077 Ischia, Naples, Italy
[2] Univ Groningen, Dept Marine Biol, Ctr Evolutionary & Ecol Studies, NL-9750 AA Haren, Netherlands
关键词
biogeography; Caulerpa racemosa; intraindividual variability; introductions; ITS; seaweeds;
D O I
10.1080/09670260010001735951
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The coenocytic green alga Caulerpa racemosa colonized the Mediterranean some time after the opening of the Suez Canal in 1869. For most of the past century it has remained confined to the southeastern Mediterranean, but over the past several years the species has been reported in abundance along the western coasts of Italy, Sardinia and the Marseille area of southern France. Whether this constitutes a natural range expansion or a possible new introduction is under discussion. The purpose of this study was to establish the ITS signatures of populations inside and outside the Mediterranean. ITS1 sequences were compared among 78 clones from 21 individuals representing 11 populations of C. racemosa, collected from the Western Mediterranean, the Canary Islands, Panama and Western Australia. Intraindividual polymorphism of ITS1 was found to be as high or higher than inter-individual polymorphism across all samples tested. Polymorphism parsimony analysis, which takes into account intra-individual variation, revealed strong separation between individuals from Panama, Fuerteventura (Canary Is.) and the Mediterranean. In contrast, none of the six Mediterranean populations could be distinguished from one another. In addition, individuals and their clones collected from Perth (Australia) and Gran Canaria were spread throughout the Mediterranean clade. Possible reasons for the lack of homogenization of ITS arrays in C. racemosa under the mechanisms of concerted evolution and implications for phylogeographic interpretation are discussed and compared with Caulerpa taxifolia.
引用
收藏
页码:349 / 356
页数:8
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