Edwards Dale D, Steele Anne, Gordon Noah M
Department of Biology, University of Evansville, Evansville, Indiana 47722.
J Parasitol. 2017 Apr;103(2):170-175. doi: 10.1645/15-840. Epub 2017 Jan 7.
This study compares the helminth faunas between Cope's gray treefrogs ( Hyla chrysoscelis ) and green treefrogs ( Hyla cinerea ), in areas where they have recently overlapped due to range expansion by H. cinerea , to determine whether or not 2 species of frogs with a high degree of similarity in many of their life history traits also exhibit similarities in the composition of their helminth assemblages. Results of this study did not find significant differences in helminth species diversity when sympatric and allopatric populations of the same species of frog were compared. There was, however, a significant difference in helminth diversity among sympatric populations of H. chrysoscelis and H. cinerea , and this difference was in large part attributable to the significantly higher abundance of the gastrointestinal nematode Cosmocercoides variabilis among H. chrysoscelis . Additional studies will be required to determine whether the observed patterns are due to differences in arrival time, perch locations within the chorus, or parasite-mediated competition.
本研究比较了科普氏灰树蛙（雨蛙属）和绿树蛙（灰绿雨蛙）的蠕虫区系，在由于灰绿雨蛙分布范围扩大而近期重叠的区域，以确定在许多生活史特征上具有高度相似性的两种蛙类在其蠕虫组合的组成上是否也表现出相似性。当比较同一物种的同域和异域种群的蛙时，本研究结果未发现蠕虫物种多样性存在显著差异。然而，科普氏灰树蛙和灰绿雨蛙的同域种群之间在蠕虫多样性上存在显著差异，这种差异在很大程度上归因于科普氏灰树蛙体内胃肠道线虫可变宇宙杆线虫的丰度显著更高。需要进一步的研究来确定观察到的模式是由于到达时间的差异、合唱区内的栖息位置，还是寄生虫介导的竞争。
