Geographic variation of chromosomes in the Japanese harvestman, Gagrellopsis nodulifera, with special reference to a hybrid zone in western Honshu
Geographic variation of chromosomes in the Japanese harvestman, Gagrellopsis nodulifera, with special reference to a hybrid zone in western Honshu
复制标题
日本收割者 Gagrellopsis nodulifera 染色体的地理变异，特别是本州西部的杂交区
作者：
N. Tsurusaki;M. Murakami;K. Shimokawa
对日本本州的28个种群的结节腹蛛(Gagrellopsis node uli/era Sato)和铃木蛛(Arachnida，Opiliones，Phalgiidae)的染色体进行了研究。染色体数目在不同种群之间，有时在种群内也有差异，范围相当大，从2n=14到22。染色体数目的这种变化主要归因于着丝粒融合或分裂。在本州西部鸟取县东部发现了一个宽约10-15公里的杂交带，2n=16和2n=22两种不同染色体数目的体型在这里相遇。提出了混合带形成的可能过程，认为混合带的起源可追溯到约8,000-10,000年前的冰后期。
Chromosomes of Gagrellopsis noduli/era Sato and Suzuki (Arachnida, Opiliones, Phalangiidae) were surveyed for 28 populations in Honshu, Japan. Chromosome numbers were found to vary among and sometimes within populations with a fairly wide range from 2n= 14 to 22. This variation in chromosome number can be mainly attributed to centric fusion or fission. A hybrid zone of about 10-15 km width was found in the eastern part of Tottori Prefecture, western Honshu, where two forms with different chromosome numbers, 2n=16 and 2n=22, meet. Presumable formation process of the hybrid zone is presented on the supposition that origin of the zone dates back to about 8,000-10,000 years B.P. during the postglacial period.
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