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首页> 外文期刊>Parasitology >Morphological and molecular diversity and phylogenetic relationships among anuran trypanosomes from the Amazonia, Atlantic Forest and Pantanal biomes in Brazil.
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Morphological and molecular diversity and phylogenetic relationships among anuran trypanosomes from the Amazonia, Atlantic Forest and Pantanal biomes in Brazil.

机译：巴西亚马逊河，大西洋森林和潘塔纳尔生物群系的无核锥虫之间的形态和分子多样性以及系统发育关系。

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摘要

We examined for the presence of trypanosomes in blood samples from 259 anurans (47 species from 8 families), the majority of which were from the Brazilian Amazonia, Atlantic Forest and Pantanal biomes. Trypanosomes were detected by a combination of microhaematocrit and haemoculture methods in 45% of the anurans, and 87 cultures were obtained: 44 from Hylidae, 22 from Leptodactylidae, 15 from Bufonidae, 5 from Leiuperidae and 1 from an unidentified anuran. High morphological diversity (11 morphotypes) was observed among blood trypanosomes from anurans of different species and of the same species as well as among trypanosomes from the same individual. Conversely, morphologically similar trypanosomes were found in anurans from distinct species and biomes. ITS and SSU rDNA polymorphisms revealed high diversity among the 82 isolates examined. Twenty-nine genotypes could be distinguished, the majority distributed in 11 groups. Phylogenetic relationships based on rDNA sequences indicated that isolates from more phylogenetically related anurans are more closely related. Comparison of anuran trypanosomes from Brazil and other countries revealed several new species among the isolates examined in this study. Phylogenetic relationships suggest that host restriction, host switching and overall ecogeographical structure may have played a role in the evolution of the anuran trypanosomes.
机译：我们检查了259种无脊椎动物（8个科的47种）血液样本中锥虫的存在，其中大多数来自巴西亚马逊河，大西洋森林和潘塔纳尔生物群系。通过微血球比容法和血液培养方法相结合，在45％的无核动物中检测到锥虫，获得了87种培养物：从Hylidae获得44种，从Leptodactylidae获得22种，从Bufonidae获得15种，从Leuperidae获得5种，以及从未鉴定的无色动物获得1种。在来自不同物种和相同物种的无色动物的血液锥虫之间以及来自同一个体的锥虫中观察到高形态学多样性（11种形态型）。相反，在形态和生物相似的无核动物中发现了形态相似的锥虫。 ITS和SSU rDNA多态性揭示了所检查的82个分离株之间的高度多样性。可以区分出29个基因型，大部分分布在11个组中。基于rDNA序列的系统发生关系表明，与系统发育相关的无色菌的分离株之间的关系更为密切。来自巴西和其他国家的无色锥虫的比较显示，在这项研究中，分离株中出现了几种新物种。系统发育关系表明宿主限制，宿主转换和整体生态地理结构可能已在无色锥虫的演变中发挥了作用。

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