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On-line version ISSN 1678-4596
Cienc. Rural vol.39 no.3 Santa Maria May/June 2009 Epub Jan 23, 2009
Ocorrência de Amblyomma longirostre em Ramphastos dicolorus no Sul do Brasil
João Fabio SoaresI; Claudia Dal Molin SoaresI; Miguel GallioI; Aleksandro Schafer da SilvaII; Juliana Pereira MoreiraIII; Darci M Barros-BattestiIV; Silvia Gonzalez MonteiroV, 1
ICurso de Medicina Veterinária, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brasil
IIPrograma de Pós-graduação em Medicina Veterinária, UFSM, Santa Maria, RS, Brasil
IIIZoológico da Universidade de Caxias do Sul, Caxias do Sul, RS, Brasil
IVFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), São Paulo, SP, Brasil
VDepartamento de Microbiologia e Parasitologia, UFSM. Faixa de Camobi, Km 9, Campus Universitário, prédio 20, Sala 4232, 97105-900, Santa Maria, RS, Brasil. E-mail: email@example.com
The species Amblyomma longirostre Koch, 1844 is poorly known in the state of Rio Grande do Sul. Usually the adult stage could be found on Sphigurus spp. and the immatures on birds (Passeriformes). Although A. longirostre is distributed in the Neotropical region, from Panama to Uruguay, it also occurs in Central America and the United States. The aim of this study was to report that Ramphastos dicolorus Linnaeus 1766 is a new host record for this tick species.
Key words: Amblyomma longirostre, Ramphastos dicolorus, new host record.
A espécie Amblyomma longirostre Koch, 1844 é pouco conhecida no Estado do Rio Grande do Sul. Normalmente a fase adulta pode ser encontrada em porquinhos Sphigurus spp., e as fases imaturas podem ser encontradas em aves (Passeriformes). A. longirostre distribui-se na região neotropical, do Panamá ao Uruguai. Ela também ocorre na América Central e nos Estados Unidos. Este estudo tem como objetivo relatar que Ramphastos dicolorus Linnaeus 1766 é um novo hospedeiro dessa espécie de carrapato.
Palavras-chave: Amblyomma longirostre, Ramphastos dicolorus, novo hospedeiro.
There are more than a hundred species of Amblyomma in the world (HORAK et al., 2002), and half of them occurs in America, from which 33 species are known in Brazil (ONOFRIO et al., 2006). The genus is represented by the biggest and most ornate ticks from the Ixodidae family. Most of species of Amblyomma in adult stage parasitizes large and median mammals, but immatures prefer to feed on small animals. Immature ticks are also found on birds that are rarely parasitized by adult ticks. On the other hand, few species in any stage prefer amphibian and reptiles as host (BARROS & BAGGIO, 1992; HORAK et al., 2002; BARROS-BATTESTI et al., 2006).
Several species of the genus Amblyomma could be potential vector of pathogens mainly because they use more than one host to complete their life cycle (MASSARD & FONSECA, 2004). According to researchers (LABRUNA et al., 2004), several Rickettsia spp. cause disease in humans and are transmitted by ticks, mites, fleas, or lice. Human could be infected by various Rickettsia spp. depending on geographical location, however the pathogenicity of some Rickettsia spp. to humans is not known. The authors found a Rickettsia strain infecting Amblyomma longirostre Koch, 1844 males collected on porcupine Coendu prehensilis (Linnaeus, 1758) (Rodentia: Erethizontidae) in the state of Rondônia (LABRUNA et al., 2004). The strain of this Rickettsia was designated as strain Aranha. Phylogenetic analysis of a partial ricketsial ompa gene showed that Aranha clustered with 'Rickettsia amblyommii'.
The species A. longirostre is popularly known as 'earring bird tick' because they feed on the neck or close to the eyes of the bird (ARAGÃO, 1936; GUIMARÃES et al., 2001). The adult ticks of this species are common on rodent porcupines but the immatures parasitize birds as well.
The specie A. longirostre was reported in the state of Rio Grande do Sul, Southern Brazil, for the first time in 1997 (OLIVEIRA et al., 1997). It was collected on Coendou villosus (F. Couvier, 1823) from a rural area near to the municipality of Porto Alegre. It was again reported in studies on the same host in the municipality of Pelotas (BRUM et al., 2003). Researchers presented a list of Passeriformes birds infested by A. longisrostre from a green area named Parque Copesul de Proteção Ambiental located at the municipality of Triunfo (ARZUA et al., 2005). According to these authors A. longirostre was found on Lathrotriccus euleri Cabanis, Pipraeidea melanonota (Vieillot), Saltator similis Lafresnaye & d'Orbigny, Synallaxis spixi PL Sclater, Tachyphonus coronatus (Vieillot), Turdus amaurocalinus Cabanis and Turdus subalaris (Seebohm).
In the present study the bird Ramphastos dicolorus Linnaeus, 1766 (Pissiformes: Ramphastidae) popularly known as 'tucano-de-bico-verde' was collected in Antônio Prado municipality (28° 51':30"S 51°16'58"W), State of Rio Grande do Sul by the Environment Patrol (PATRAM). This locality is elevated 658 m above sea level with an annual average temperature of 16°C, and annual average rainfall of 1.987mm. As the bird was stressed it was transported to the Zoo of the Universidade de Caxias do Sul for medical care. After examination the ticks were removed from the skin close to the neck, and preserved in alcohol 70%. All ticks collected were nymphs and they were sent to Instituto Butantan to be identified. The nymphs were identified by optical and scanning electron microscopy and the identification was performed according to the key proposed by KEIRANS & DURDEN (1998). Two of them were dehydrated for 30 minutes in each of the following concentrations of alcohol: 70%, 80%, 90% and 100% (three times). They were then kept in acetone until undergoing critical point dried. Micrographs were taken in the Laboratory of Electron Microscopy, Museu de Zoologia da Universidade de São Paulo, using a ZEISS/LEO 440 Scanning Electron Microscope.
Among the morphological characteristics A. longirostre is the only species of Amblyomma that has lancet hypostome in nymphs (Figure 1.1) and in females. The nymph also presents long gnathosoma with basis capituli triangular (Figure 1.2); scutum with 7-8 large punctuations in the lateral fields and behind of the eyes (Figure 1.3); and the coxae I-IV present short external spurs, obsolete in coxa III as well as the internal spur on coxa I. (Figure 1.4).
The geographical distribution of this tick species includes South of Mexico, Bolivia, Colombia, French Guyana, Panama, Trinidad & Tobago, Argentina, Paraguay and Venezuela (GUGLIELMONE et al., 2003; ONOFRIO et al., 2006). This specie was also reported in the United States (JONES et al., 1972). In Brazil it was registered in the followings states: Paraná, Pernambuco, Rio de Janeiro, São Paulo, Santa Catarina, Minas Gerais, Goiás, Acre, Amazonas, Pará (GUIMARÃES et al. 2001; ARZUA et al. 2005; STORNI et al. 2005) and Rio Grande do Sul (OLIVEIRA et al., 1997; BRUM et al., 2003; ARZUA et al., 2005). Considering the preference of this species to parasitize porcupine and birds, the nymphs reported as A. longirostre on Felis tigrina Schereber, 1775 (Carnivora: Felidae), from the state of Paraná (BARROS & BAGGIO, 1992) were not A. longirostre but Amblyomma sp. The mistake was observed after comparing nymphs of this and other Amblyomma spp. during the revision of the tick material deposited at the Museu de História Natural Capão da Imbuia (ARZUA et al., 2005).
To the author's knowledge, this is the first report of A. longirostre on R. dicolorus as well as for the family Ramphastidae. One concern on this tick species per se is the involvement with the environmental transmission of rickettsial agents. Nevertheless fortunately there is no evidence to support human as host for this tick species (LABRUNA et al., 2004).
This work was supported in part by the Fundação de Amparo à Pesquisa do Estado de São Paulo by means of the project Fapesp no. 2007-57749-2 and Conselho Nacional de Desenvolvimento Científico e Técnológico (CNPq) by means of Academic career scholarship to DMBB.
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1 Autor para correspondência.