A surrogate life cycle of Amblyomma ovale Koch, 1844.
As ticks spend most of their time off-host, the environment is a major selective force of these parasites. In fact, human impact on landscapes has favored a minority of tick species which became well-known pests. However, this is an ongoing process and novel pests may arise. We herein report a surrogate life cycle of a neotropical tick species, Amblyomma ovale, and which may be related to an increased risk of human rickettsiosis. Under natural conditions, adults of this tick species feed on carnivores and exhibit non-nidicolous ambush behavior, whereas larvae and nymphs feed on small rodents and birds. In an anthropized spot within an Atlantic rainforest reserve of Brazil, an A. ovale population exhibited a nidicolous behavior with all 3 tick stages feeding on the dog. This dog's infestation was outstandingly high, and it displayed the highest anti-Rickettsia titers and harbored Rickettsia-infected ticks.
Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal de Uberlândia, Av. Pará, 1720/Campus Umuarama-Bloco 2T, Uberlândia, Minas Gerais, Brazil. szabo@famev.ufu.br
M P J
MP
Szabó
T F
TF
Martins
F A
FA
Nieri-Bastos
M G
MG
Spolidorio
M B
MB
Labruna
D000818:Animals; D001938:Brazil / Q000453:epidemiology; D004283:Dog Diseases / Q000469:parasitology*; D004285:Dogs; D005247:Feeding Behavior; D005260:Female; D026863:Ixodidae / Q000382:microbiology / Q000502:physiology*; D008018:Life Cycle Stages; D008297:Male; D012281:Rickettsia / Q000276:immunology / Q000302:isolation & purification; D013984:Tick Infestations / Q000469:parasitology / Q000662:veterinary*