Guglielmone Alberto A, Nava Santiago, Mastropaolo Mariano, Mangold Atilio J
Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Consejo Nacional de Investigaciones Científicas y Técnicas CC 22, CP 2300 Rafaela, Santa Fe, Argentina.
Ticks Tick Borne Dis. 2013 Sep;4(5):386-90. doi: 10.1016/j.ttbdis.2013.01.009. Epub 2013 May 4.
A study was conducted to investigate the distribution of Amblyomma triste in Argentina under the hypothesis that this tick prevails in riparian localities along the Paraná River and adjacent humid environments from 34° 30' S to 25° 20' S, approximately. Ticks were collected from mammals and vegetation in those environments from November 2008 to October 2012. Additionally, genetic variation was tested from Argentinean, Brazilian, Chilean, and Uruguayan populations of A. triste by comparing sequences of 16S rDNA mitochondrial gene. The hypothesis was not confirmed because A. triste were collected at 36° 16' S, well beyond the southern limit predicted, and the distribution along the banks of the Paraná River was not continuous. The northernmost population of A. triste within Argentina was found at 25° 42' S. Still undetermined abiotic factors and plant communities may play a role in modulating the abundance of A. triste because host availability does not appear to be a restriction factor. The genetic variation among A. triste populations from Argentina, Brazil, and Uruguay indicates that they belong to a unique taxon that is considered bona fide A. triste (type locality Montevideo, Uruguay) while it is unclear if the Chilean population of A. triste is conspecific with the other populations investigated in this study. It would be of importance to compare those genetically homogeneous populations with other populations of alleged A. triste, especially populations established in the Nearctic Zoogeographic Region in Mexico and USA.
开展了一项研究，以调查阿根廷地区黑角花蜱的分布情况，研究基于这样的假设：这种蜱虫主要分布在巴拉那河沿岸的河岸地区以及南纬34°30′至25°20′附近的相邻潮湿环境中。2008年11月至2012年10月期间，在这些环境中的哺乳动物和植被上采集蜱虫。此外，通过比较16S rDNA线粒体基因序列，对来自阿根廷、巴西、智利和乌拉圭的黑角花蜱种群进行了遗传变异测试。该假设未得到证实，因为在南纬36°16′采集到了黑角花蜱，这一地点远超出预测的南部界限，而且在巴拉那河沿岸的分布并不连续。在阿根廷境内，最北端的黑角花蜱种群位于南纬25°42′。尚未确定的非生物因素和植物群落可能在调节黑角花蜱的数量方面发挥作用，因为宿主的可获得性似乎不是限制因素。来自阿根廷、巴西和乌拉圭的黑角花蜱种群之间的遗传变异表明，它们属于一个独特的分类单元，被认为是真正的黑角花蜱（模式产地为乌拉圭蒙得维的亚），而尚不清楚智利的黑角花蜱种群是否与本研究中调查的其他种群同种。将这些基因同质的种群与其他所谓的黑角花蜱种群进行比较，尤其是在墨西哥和美国新北区动物地理区域发现的种群，将具有重要意义。
