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首页> 美国卫生研究院文献>Comparative Cytogenetics >Karyotypic variation in the long-whiskered catfish Pimelodusblochii Valenciennes 1840 (Siluriformes Pimelodidae) from the lower Tapajós Amazonas and Trombetas Rivers
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Karyotypic variation in the long-whiskered catfish Pimelodusblochii Valenciennes 1840 (Siluriformes Pimelodidae) from the lower Tapajós Amazonas and Trombetas Rivers

机译：来自塔帕霍斯河亚马孙河和Trombetas河下游的长须long鱼Pimelodusblochii Valenciennes（1840年SiluriformesPimelodidae）的核型变化

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摘要

The genus Pimelodus LaCépède, 1803 comprises 35 formally recognized species distributed along the major neotropical river basins. Despite conservatism in diploid number with 2n=56, an intense variation of chromosomal morphology (karyotypic formula) has been documented in Pimelodus species. In the present study, we analyzed karyotypes of 20 specimens, identified as Pimelodusblochii Valenciennes, 1840 and collected from the lower courses of the Tapajós, Amazonas and Trombetas Rivers. The karyotypes were characterized by Giemsa conventional staining, C-banding, silver staining (Ag-NOR) and fluorescent in situ hybridization (FISH) with 5S and 18S rDNA probes. The karyotypes showed 2n=56 chromosomes in fish from the Tapajós River. In contrast, fish from the Amazonas and Trombetas Rivers had 2n=58. The nucleolus organizing regions were labeled on the short arm of an acrocentric chromosome as demonstrated by silver staining and FISH. Signals for 18S and 5S rDNA were co-localized on one chromosome pair. Our results demonstrate karyotypic divergence between Tapajós and Amazonas-Trombetas populations of P.blochii, interpreted as supporting the existence of a species complex in this taxon.
机译：PimelodusLaCépède属，1803年，共有35种在新热带河流域主要地区得到正式认可的物种。尽管二倍体数目的保守性为2n = 56，但已在Pimelodus物种中记录了染色体形态（核型公式）的强烈变化。在本研究中，我们分析了20个标本的核型，标本为Pimelodusblochii Valenciennes，1840年，并从Tapajós，Amazonas和Trombetas河的下游收集。核型通过Giemsa常规染色，C带，银染（Ag-NOR）和与5S和18S rDNA探针的荧光原位杂交（FISH）进行表征。塔帕霍斯河的鱼的核型显示2n = 56个染色体。相比之下，来自亚马逊河和特罗姆贝塔斯河的鱼类的2n = 58。如银染和FISH所示，核仁组成区域标记在近端染色体的短臂上。 18S和5S rDNA的信号共定位在一个染色体对上。我们的结果表明，P.blochii的Tapajós和Amazonas-Trombetas种群之间存在核型差异，这被解释为支持该分类群中某个物种复合体的存在。

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