Notes on Population Dynamics of Amblyomma Ticks (Acari: Ixodidae) in Brazil

Labruna, Marcelo B.; Terassini, Flávio Aparecido; Camargo, Luís Marcelo Aranha

doi:10.1645/ge-1878.1

Cited by 44 publications

(31 citation statements)

References 14 publications

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“…The predominance of larvae and nymphs of Amblyomma spp. in birds in the dry season in the Neotropical region has been widely reported (Marini et al 1996;Labruna et al 2007Labruna et al , 2009Luz et al 2012;Amaral et al 2013), as was also observed herein (Table 2). Higher parasite intensities were also observed in this season (Fig.…”

Section: Discussionsupporting

confidence: 88%

Additional information about tick parasitism in Passeriformes birds in an Atlantic Forest in southeastern Brazil

et al. 2015

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The habits of birds make them more or less susceptible to parasitism by certain tick species. Therefore, while some bird species are typically found to be intensely infested, others are relatively unaffected. This study investigated the occurrence of ticks in Passeriformes inhabiting an Atlantic Forest fragment in southeastern Brazil, during the dry and rainy seasons, by means of parasitological indexes and multiple correspondence analysis, to determine the factors that influence tick parasitism in these birds. Data were collected on 2391 ticks, all classified in the Amblyomma genus, from 589 birds. The ticks identified to the species level were A. longirostre, A. nodosum, A. calcaratum, A. parkeri, and A. ovale. Thamnophilidae, Conopophagidae, Thraupidae, Dendrocolaptidae, and Platyrinchidae were the families with the highest prevalence. In terms of parasite intensity, the families Conopophagidae, Thamnophilidae, Thraupidae, Furnariidae, and Pipridae stood out with the highest values. Bird species that are generalists regarding eating habits and habitat occupation tended to have higher parasite loads, as did larger species and those inhabiting the understory. The tick prevalence was higher in the dry season than in the rainy season. The majority of the ticks were collected from the head region, mainly around the eyes and in the nape. Also, this work reports 22 new bird-parasite relations.

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Section: Discussionsupporting

confidence: 88%

Additional information about tick parasitism in Passeriformes birds in an Atlantic Forest in southeastern Brazil

et al. 2015

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“…Labruna et al 2002bLabruna et al , 2009bOliveira et al 2000). Some species of ticks synchronize the period of eggs incubation with the months of spring and summer, when higher temperatures decrease the incubation period and higher humidity, also provided by the vegetation covering the soil, increases the eggs hatchability (Labruna et al 2009b).…”

Section: Discussionmentioning

confidence: 99%

Association patterns of ticks (Acari: Ixodida: Ixodidae, Argasidae) of small mammals in Cerrado fragments, western Brazil

et al. 2015

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The present study describes ticks associated with small mammals and analyzes the aggregation patterns according to seasonal and host variations in the Cerrado biome, central-western Brazil. Small mammals were systematically captured in 54 woodland fragments from February 2012 to July 2013. A total of 1,040 animals belonging to eight marsupial and 12 rodent species were captured; 265 animals were parasitized by eight tick species (in decreasing order of abundance): Ornithodoros mimon, Amblyomma coelebs, Amblyomma sculptum, Amblyomma ovale, Amblyomma parvum, Amblyomma dubitatum, Amblyomma parkeri, and Ixodes amarali. With few exceptions, collected ticks were larvae and nymphs. Among the more abundant animals, the marsupial Didelphis albiventris showed the highest tick prevalence (84.4 %), mean abundance (19.2), mean intensity (22.8), richness of ticks species (n = 7), and total abundance of ticks (n = 2,457). Amblyomma sculptum and O. mimon were the most generalist species, collected on four host species. Fifteen new tick-host associations are reported for the first time. Most ticks showed higher prevalence and mean intensity in the dry season, regardless of host species. Overall, tick prevalence and mean intensity of infestation were significantly associated with host gender. Finally, the importance of the large number of records of the argasid O. mimon is discussed.

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“…The dragging time schedule was intended to avoid both morning dew that would soak the cloth and periods of the day with direct exposure of vegetation to sun (when ticks descend to lower levels, making them unavailable to drag sampling). Both rainy and dry seasons were sampled because Amblyomma ticks in Brazil have a one-year life cycle, with adults prevailing in the rainy season and immatures in the dry one [13]. Collected ticks were stored in alcohol and identified based on dichotomous keys for adults and Amblyomma nymphs [14][15][16].…”

Section: Tick Collection and Identificationmentioning

confidence: 99%

Serologic evidence of the exposure of small mammals to spotted-fever Rickettsia and Rickettsia bellii in Minas Gerais, Brazil

Coelho

Limongi

Lemos

et al. 2016

J Infect Dev Ctries

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Introduction: Sources of pathogenic Rickettsia in wildlife are largely unknown in Brazil. In this work, potential tick vectors and seroreactivity of small mammals against four spotted-fever group Rickettsia (R. rickettsii, R. parkeri, R. amblyommii and R. rhipicephali) and Rickettsia bellii from peri-urban areas of Uberlândia, a major town in Brazil, are described for the first time. Methodology: Small mammals were captured and blood samples collected. Ticks were collected from the surface of the host and the environment and posteriorly identified. Reactivity of small mammal sera to Rickettsia was tested by indirect immunofluorescence assay (IFA) using crude antigens from five Brazilian Rickettsia isolates. Results: Information was obtained from 416 small mammals (48 Marsupialia and 368 Rodentia). Forty-eight animals were parasitized and two tick species, Ixodes loricatus and Amblyomma dubitatum, were found on several host species, with a few tick-host relationships described for the first time. From the 416 tested sera, 70 reacted to at least one Rickettsia antigen (prevalence of 16.8%) and from these, 19 (27.1%) reacted to two or more antigens. Seroprevalence was higher for marsupials (39.6%) than for rodents (13.8%). Marsupial and Rhipidomys spp. sera reacted mainly (highest seroprevalence and titers) to R. bellii, and that of Necromys lasiurus mainly to R. rickettsii. Conclusions: Although the serologic assays poorly discriminate between closely related spotted-fever group Rickettsia, the observed small mammal seroreactivity suggests the circulation of Rickettsia in the peri-urban area of Uberlândia, albeit at low levels.

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Notes on Population Dynamics of Amblyomma Ticks (Acari: Ixodidae) in Brazil

Cited by 44 publications

References 14 publications

Additional information about tick parasitism in Passeriformes birds in an Atlantic Forest in southeastern Brazil

Additional information about tick parasitism in Passeriformes birds in an Atlantic Forest in southeastern Brazil

Association patterns of ticks (Acari: Ixodida: Ixodidae, Argasidae) of small mammals in Cerrado fragments, western Brazil

Serologic evidence of the exposure of small mammals to spotted-fever Rickettsia and Rickettsia bellii in Minas Gerais, Brazil

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