浮遊性有孔虫の分子系統解析からみた両極性分布の成立過程(<特集>中〜高緯度の両極性分布を持つ生物から見た地球史)

概要

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Recent molecular phylogenetic analyses have clarified a bipolarity (anti-tropic distribution) where genetic exchanges exist between some bipolar Arctic and Antarctic populations of planktonic foraminifers. However, the bipolarity of the species is not always congruent with the genotype distributions. In fact, the genotypes of Neogloboquadrina pachyderma (dex) genotype I, Globigerina bulloides genotypes IIa and IIb, and Turborotalita quinqueloba genotype IIa significantly indicate a bipolar distribution. Whereas, genotypes of G. bulloides, except for genotypes IIa and IIb, and all 7 genotypes of N. pachyderma (sin) indicate different non-bipolar distribution patterns respectively, with the genotypes showing no genetic exchange between the northern and southern hemispheres. In addtion, from tropic to subtropic genotype of both Orbulina universa (Sargasso genotype) and Globorotalia truncatulinoides (genotype sp. 2) indicate anti-tropic-like distribution, even though these morphospecies show continuous distribution. Evolutionary processes of the bipolarity of planktonic foraminifers are reviewed in this paper on the basis of distribution of both morphospecies and genotypes to see whether common characteristics of bipolarity exist between species or among genotypes.
日本古生物学会の論文
2009-03-31