Mitrani Department of Desert Ecology, The Swiss Institute for Dryland Environmental and Energy Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede-Boqer Campus, 84990 Midreshet Ben-Gurion, Israel.
Int J Parasitol. 2013 Aug;43(9):763-70. doi: 10.1016/j.ijpara.2013.05.001. Epub 2013 Jun 4.
We investigated spatial variation in the phylogenetic structure (measured as a degree of phylogenetic clustering) of flea assemblages across the geographic ranges of 11 Palearctic species of small mammalian hosts and asked whether the phylogenetic structure of the flea assemblage of a host in a locality is affected by (i) distance of this locality from the centre of the host's geographic range, (ii) geographic position of the locality (distance to the equator) and (iii) phylogenetic structure of the entire flea assemblage of the locality. Our results demonstrated that the key factor underlying spatial variation of the phylogenetic structure of the flea assemblage of a host was the distance from the centre of the host's geographic range. However, the pattern of this spatial variation differed between host species and might be explained by their species-specific immunogenetic and/or distributional patterns. Local flea assemblages may also, to some extent, be shaped by environmental filtering coupled with historical events. In addition, the phylogenetic structure of a local within-host flea assemblage may mirror the phylogenetic structure of the entire across-host flea assemblage in that locality and, thus, be affected by the availability of certain phylogenetic lineages.
我们调查了 11 种古北界小型哺乳动物宿主的地理分布范围内跳蚤组合的系统发育结构（以系统发育聚类程度衡量）的空间变化，并询问了一个地点的宿主跳蚤组合的系统发育结构是否受到以下因素的影响：（i）该地点与宿主地理分布中心的距离，（ii）地点的地理位置（距离赤道的距离）和（iii）该地点整个跳蚤组合的系统发育结构。我们的结果表明，宿主跳蚤组合系统发育结构空间变化的关键因素是宿主地理分布中心的距离。然而，这种空间变化模式在宿主物种之间存在差异，可能与其特定的免疫遗传学和/或分布模式有关。局部跳蚤组合也可能在一定程度上受到环境过滤和历史事件的影响。此外，局部体内跳蚤组合的系统发育结构可能反映了该地点整个宿主间跳蚤组合的系统发育结构，因此受到某些系统发育谱系可用性的影响。
