Cunha-Barros M, Van Sluys M, Vrcibradic D, Galdino C A, Hatano F H, Rocha C F
Setor de Ecologia, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, UERJ, CEP 20550-013, Rio de Janeiro, RJ, Brazil.
Braz J Biol. 2003 Aug;63(3):393-9. doi: 10.1590/s1519-69842003000300005. Epub 2004 Jan 20.
We studied the parasitism by larvae of the chigger mite Eutrombicula alfreddugesi on the lizard community of Restinga de Jurubatiba, Rio de Janeiro State, Southeastern Brazil. We investigated the patterns of infestation (prevalence and intensity) of chigger mites in four sympatric lizards: Tropidurus torquatus, Mabuya agilis, M. macrorhyncha and Cnemidophorus littoralis. All lizards collected were checked for the presence of mites, which were counted under stereomicroscope. We tested the relationship between intensity of infestation and lizard body size for each species using regression analysis. The prevalences and mean intensities (+ one standard deviation) of infestation on each host species were, respectively: 100%; 86.4 + 94.6 in T. torquatus (n = 62); 100%; 20.9 + 9.3 in M. agilis (n = 7); 100%; 11.1 + 13.1 in M. macrorhyncha (n = 12); and 95.2%; 19.1 + 16.8 in C. littoralis (n = 21). Only for C. littoralis did body size significantly affect the intensity of infestation (r = 0.27, p = 0.02). For all lizard species, the body parts where chiggers occurred with the highest intensity were those of skin folds and joint regions.
我们研究了恙螨幼虫尤氏真恙螨（Eutrombicula alfreddugesi）对巴西东南部里约热内卢州茹鲁巴蒂巴沙洲蜥蜴群落的寄生情况。我们调查了四种同域蜥蜴——饰纹角蜥（Tropidurus torquatus）、敏捷柔蜥（Mabuya agilis）、大吻柔蜥（M. macrorhyncha）和滨海健肢蜥（Cnemidophorus littoralis）——中恙螨的感染模式（患病率和感染强度）。对所有采集到的蜥蜴进行检查，以确定是否存在恙螨，并在体视显微镜下对其进行计数。我们使用回归分析测试了每个物种的感染强度与蜥蜴体型之间的关系。每种宿主物种的感染患病率和平均感染强度（±一个标准差）分别为：饰纹角蜥，患病率100%；86.4±94.6（n = 62）；敏捷柔蜥，患病率100%；20.9±9.3（n = 7）；大吻柔蜥，患病率100%；11.1±13.1（n = 12）；滨海健肢蜥，患病率95.2%；19.1±16.8（n = 21）。只有滨海健肢蜥的体型对感染强度有显著影响（r = 0.27，p = 0.02）。对于所有蜥蜴物种而言，恙螨感染强度最高的身体部位是皮肤褶皱和关节区域。
