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A re-examination of the West European species of Boreonectes Angus, 2010, with particular reference to B. multilineatus (Falkenström, 1922) (Coleoptera, Dytiscidae)
Comparative Cytogenetics ( IF 1 ) Pub Date : 2021-01-14 , DOI: 10.3897/compcytogen.v15.i1.60188
Robert B. Angus

The West European species of Boreonectes Angus, 2010 are reviewed. B. multilineatus (Falkenström, 1922) is shown to be widely distributed in the Pyrenees, where it is the only species known to occur. The chromosomes of all five west European species are found to have, in addition their different numbers of chromosomes, differences in the number and locations of secondary constrictions, and in some cases, the number of chromosomes with clear centromeric C-bands. The level of differences between the chromosomes of the species is in stark contrast with the very slight genetic (DNA) differences between them and this suggests that chromosome differentiation may have been a driver of speciation. Two of the species, B. griseostriatus (De Geer, 1774) and B. multilineatus, have distributions extending northwards as far as Arctic Scandinavia. It is pointed out that, while these northern areas now constitute the major portions of their ranges, they must be of fairly recent origins as most of the area would have been covered by ice sheets and therefore not habitable during the glacial maximum of the Last Glaciation. This contrasts with the situation in the area of the Central European mountains where fossil faunas, including Boreonectes, are known. B. griseostriatus, identifiable to species by its parameres, was present in the Woolly Rhinoceros site at Starunia in the Western Ukraine, and this fauna is discussed as well as an English fauna of similar age.

中文翻译:

重新检查西欧物种的勃朗峰(Boreonectes Angus),2010年,特别是多头芽孢杆菌(B. multilineatus)(Falkenström,1922年)(鞘翅目,Dytiscidae)

回顾了西欧安格斯(Boreonectes Angus)的2010年物种。B. multilineatus(Falkenström,1922)被证明在比利牛斯山脉广泛分布,是已知的唯一物种。发现所有五种西欧物种的染色体都具有不同数量的染色体,此外,其次生收缩的数量和位置也不同,在某些情况下,具有清晰的着丝粒C波段的染色体数量也不同。该物种的染色体之间的差异水平与它们之间极小的遗传(DNA)差异形成鲜明对比,这表明染色体分化可能是物种形成的驱动力。其中有两个物种,灰背芽孢杆菌(B. griseostriatus)(De Geer,1774年)和多分支芽孢杆菌(B. multilineatus),分布向北延伸至北极斯堪的纳维亚半岛。需要指出的是,尽管这些北部地区现在已成为其范围的主要部分,但它们必须是较新的起源,因为该地区的大部分地区本来会被冰盖覆盖,因此在上一次冰川期的冰川最大时期是不可居住的。与之形成鲜明对比的是中欧山区的地区,那里的化石动物群(包括硼烷科动物)广为人知。乌克兰西部的Starunia的Woolly Rhinoceros遗址中发现了B. griseostriatus,通过其准动物可以识别其种类,并且对该动物群以及与之相似的英语动物群进行了讨论。它们必须是较新的起源,因为大部分地区将被冰盖覆盖,因此在上一次冰川盛行的冰川最大时期是不可居住的。这与中欧山区的情况形成鲜明对比,中欧山区的化石动物群(包括硼烷科动物)广为人知。乌克兰西部的Starunia的Woolly Rhinoceros遗址中发现了B. griseostriatus,通过其准动物可以识别其种类,并且对该动物群以及与之相似的英语动物群进行了讨论。它们必须是较新的起源,因为大部分地区将被冰盖覆盖,因此在上一次冰川盛行的冰川最大时期是不可居住的。这与中欧山区的情况形成鲜明对比,中欧山区的化石动物群(包括硼烷科动物)广为人知。乌克兰西部的Starunia的Woolly Rhinoceros遗址中发现了B. griseostriatus,通过其准动物可以识别其种类,并且对该动物群以及与之相似的英语动物群进行了讨论。
更新日期:2021-01-14
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