Instituto Nacional de Tecnología Agropecuaria, Rafaela, Santa Fe, Argentina.
Exp Appl Acarol. 2010 Aug;51(4):335-51. doi: 10.1007/s10493-009-9331-6. Epub 2010 Jan 19.
We supply information about hosts and distribution of Amblyomma dubitatum. In addition, we carry out an analysis of genetic divergence among specimens of A. dubitatum from different localities and with respect to other Neotropical Amblyomma species, using sequences of 16S rDNA gene. Although specimens of A. dubitatum were collected on several mammal species as cattle horse, Tapirus terrestris, Mazama gouazoubira, Tayassu pecari, Sus scrofa, Cerdocyon thous, Myocastor coypus, Allouata caraya, Glossophaga soricina and man, most records of immature and adult stages of A. dubitatum were made on Hydrochoerus hydrochaeris, making this rodent the principal host for all parasitic stages of this ticks. Cricetidae rodents (Lundomys molitor, Scapteromys tumidus), opossums (Didelphis albiventris) and vizcacha (Lagostomus maximus) also were recorded as hosts for immature stages. All findings of A. dubitatum correspond to localities of Argentina, Brazil, Paraguay and Uruguay, and they were concentrated in the Biogeographical provinces of Pampa, Chaco, Cerrado, Brazilian Atlantic Forest, Parana Forest and Araucaria angustifolia Forest. The distribution of A. dubitatum is narrower than that of its principal host, therefore environmental variables rather than hosts determine the distributional ranges of this tick. The intraspecific genetic divergence among 16S rDNA sequences of A. dubitatum ticks collected in different localities from Argentina, Brazil and Uruguay was in all cases lower than 0.8%, whereas the differences with the remaining Amblyomma species included in the analysis were always bigger than 6.8%. Thus, the taxonomic status of A. dubitatum along its distribution appears to be certain at the specific level.
我们提供了关于 Amblyomma dubitatum 的宿主和分布信息。此外，我们还使用 16S rDNA 基因序列对来自不同地区和其他新热带地区 Amblyomma 物种的 A. dubitatum 标本进行了遗传分歧分析。尽管 A. dubitatum 的标本采集自几种哺乳动物，如牛、马、貘、马鬃鹿、野猪、西貒、白唇猪獾、秃猴、食蚁兽和人，但 A. dubitatum 的未成熟和成虫阶段的大多数记录都是在水豚身上发现的，这使得这种啮齿动物成为这种蜱虫所有寄生阶段的主要宿主。还有一些其他的啮齿动物（如 Lundomys molitor、Scapteromys tumidus）、负鼠（Didelphis albiventris）和兔驼（Lagostomus maximus）也被记录为未成熟阶段的宿主。所有 A. dubitatum 的发现都与阿根廷、巴西、巴拉圭和乌拉圭的地点相对应，它们集中在潘帕斯、查科、塞拉多、巴西大西洋森林、巴拉那森林和狭叶南洋杉森林等生物地理省份。A. dubitatum 的分布范围比其主要宿主更窄，因此环境变量而不是宿主决定了这种蜱虫的分布范围。从阿根廷、巴西和乌拉圭不同地区采集的 A. dubitatum 蜱 16S rDNA 序列的种内遗传分歧在所有情况下都低于 0.8%，而与分析中包括的其他 Amblyomma 物种的差异始终大于 6.8%。因此，A. dubitatum 在其分布范围内的分类地位在种的水平上似乎是确定的。
