Abstract
Reptiles and amphibians are exceptional hosts for different ectoparasites, including mites and ticks. In this study, we investigated tick infestations on reptiles and amphibians trapped in Central Amazonia, and also assessed the presence of rickettsial infections in the collected ticks. From September 2016 to September 2019, 385 reptiles (350 lizards, 20 snakes, 12 tortoises, and three caimans) and 120 amphibians (119 anurans and one caecilian) were captured and examined for ectoparasites. Overall, 35 (10%) lizards, three (25%) tortoises and one (0.8%) toad were parasitized by ticks (124 larvae, 32 nymphs, and 22 adults). In lizards, tick infestation varied significantly according to landscape category and age group. Based on combined morphological and molecular analyses, these ticks were identified as Amblyomma humerale (14 larvae, 12 nymphs, 19 males, and one female), Amblyomma nodosum (three larvae, one nymph, and one female), and Amblyomma rotundatum (four larvae, three nymphs, and one female), and Amblyomma spp. (103 larvae and 16 nymphs). Our study presents the first records of A. nodosum in the Amazonas state and suggests that teiid lizards are important hosts for larvae and nymphs of A. humerale in Central Amazonia. Moreover, a nymph of A. humerale collected from a common tegu (Tupinambis teguixin) was found positive for Rickettsia amblyommatis, which agrees with previous reports, suggesting that the A. humerale-R. amblyommatis relationship may be more common than currently recognized.
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Acknowledgements
We are grateful to the Postgraduate Development Program (PDPG—Amazônia Legal/CAPES) and to One Health Project in Areas of Urban and Peri-Urban Streams from Porto Velho (SUIg_PVH/UNIR/CAPES) for the Postdoctoral Fellowship to AMP; to CNPq (Brazilian National Council for Scientific and Technological Development) for the productivity fellowships to FDT, ILK and FACP. We also thank Giulliana Appel, Gabriel S. Masseli, Adriane C. Ramires, ‘Juruna’ Ocírio Pereira, Rafael P. Kautzmann and the team of the laboratory ‘Ecologia de doenças transmissíveis na Amazônia’ (EDTA) for their help in the fieldwork. This study was supported by the CNPq (Universal 461.573/2014-8 and 429.132/2016-6) and Excellence Program in Basic and Applied Health Research (PROEP FIOCRUZ FAPEAM 001/2014). We also thank the Biological Dynamics of Forest Fragments Project (BDFFP) Thomas Lovejoy Research Fellowship Program for fieldwork support. This is publication number (827) in the BDFFP technical series.
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Dantas-Torres, F., Picelli, A.M., Sales, K.G. et al. Ticks on reptiles and amphibians in Central Amazonia, with notes on rickettsial infections. Exp Appl Acarol 86, 129–144 (2022). https://doi.org/10.1007/s10493-021-00682-8
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DOI: https://doi.org/10.1007/s10493-021-00682-8