Low clonal diversity and morphometrics in the parthenogenetic earthworm Octolasion cyaneum (Sav.)

被引:13
作者
Terhivuo, J
Saura, A
机构
[1] Univ Helsinki, Finnish Museum Nat Hist, Zool Museum, FIN-00014 Helsinki, Finland
[2] Umea Univ, Dept Mol Biol, SE-90187 Umea, Sweden
关键词
Octolasion cyaneum; Lumbricidae; earthworm; clone; parthenogenesis;
D O I
10.1016/S0031-4056(04)70218-8
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Enzyme electrophoresis indicated that the cosmopolitan parthenogenetic earthworm Octolasion cyaneum (Sav.) has a very low clonal variability in populations located far from each other in Europe and Australia. In northern Europe, namely Finland, Sweden and Estonia, only one or two clones were found at a site. Specimens from Germany, England and Australia also had a low clonal heterogeneity. A sample from Switzerland showed, however, a higher clone pool diversity in comparison to that of the other sites. in general, the ratio number of clones/number of worms studied was higher in the southern than in the northern sample localities. This is best explained by assuming that there is a low-frequency flow of immigrating propagules from the south to the north. Ne propose that the low heterogeneity of the mainly anthropochorously spreading O. cyaneum is rather due to founder effect than to competitive exclusion of less adapted clones. Morphometric variability measured in O. cyaneum adults showed some statistically significant differences between the localities but no clear-cut geographical trends were found. The differences in morphometric characters are best attributed to local factors.
引用
收藏
页码:434 / 439
页数:6
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