Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host
Here we offer a multivariable analysis that explores associations of different factors (i.e., environmental, host parameters, presence of other ectoparasites) with the interaction of Amblyomma triste immature stages and one of its main hosts in Argentina, the rodent Akodon azarae. Monthly and for tw...
| Autores principales: | , , , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
2018
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| Acceso en línea: | https://www.sciencedirect.com/science/article/pii/S0304401715002939 http://hdl.handle.net/20.500.12123/3012 https://doi.org/10.1016/j.vetpar.2015.06.012 |
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| author | Colombo, Valeria Carolina Nava, Santiago Antoniazzi, Leandro Raúl Monje, Lucas Daniel Racca, Andrea Laura Guglielmone, Alberto Beldomenico, Pablo Martín |
| author_browse | Antoniazzi, Leandro Raúl Beldomenico, Pablo Martín Colombo, Valeria Carolina Guglielmone, Alberto Monje, Lucas Daniel Nava, Santiago Racca, Andrea Laura |
| author_facet | Colombo, Valeria Carolina Nava, Santiago Antoniazzi, Leandro Raúl Monje, Lucas Daniel Racca, Andrea Laura Guglielmone, Alberto Beldomenico, Pablo Martín |
| author_sort | Colombo, Valeria Carolina |
| collection | INTA Digital |
| description | Here we offer a multivariable analysis that explores associations of different factors (i.e., environmental, host parameters, presence of other ectoparasites) with the interaction of Amblyomma triste immature stages and one of its main hosts in Argentina, the rodent Akodon azarae. Monthly and for two years, we captured and sampled rodents at 16 points located at 4 different sites in the Parana River Delta region. The analyses were conducted with Generalized Linear Mixed Models with a negative binomial response (counts of larvae or nymphs). The independent variables assessed were: (a) environmental: trapping year, season, presence of cattle; type of vegetation (natural grassland or implanted forest); rodent abundance; (b) host parameters: body length; sex; body condition; blood cell counts; natural antibody titres; and (c) co-infestation with other ectoparasites: other stage of A. triste; Ixodes loricatus; lice; mites; and fleas. Two-way interaction terms deemed a priori as relevant were also included in the analysis. Larvae were affected by all environmental variables assessed and by the presence of other ectoparasites (lice, fleas and other tick species). Host factors significantly associated with larval count were sex and levels of natural antibodies. Nymphs were associated with season, presence of cattle, body condition, body length and with burdens of I. loricatus. In most cases, the direction and magnitude of the associations were context-dependent (many interaction terms were significant). The findings of greater significance and implications of our study are two. Firstly, as burdens of A. triste larvae and nymphs were greater where cattle were present, and larval tick burdens were higher in implanted forests, silvopastoral practices developing in the region may affect the population dynamics of A. triste, and consequently the eco-epidemiology of Rickettsia parkeri. Secondly, strong associations and numerous interactions with other ectoparasites suggest that co-infestations may be more important for tick dynamics than has so far been appreciated. |
| format | Artículo |
| id | INTA3012 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | INTA30122018-08-08T13:04:54Z Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host Colombo, Valeria Carolina Nava, Santiago Antoniazzi, Leandro Raúl Monje, Lucas Daniel Racca, Andrea Laura Guglielmone, Alberto Beldomenico, Pablo Martín Amblyomma Roedores Relaciones Huésped Parásito Parasitismo Enfermedades Transmitidas por Garrapatas Rodents Host Parasite Relations Parasitism Tickborne Diseases Amblyomma triste Garrapatas Here we offer a multivariable analysis that explores associations of different factors (i.e., environmental, host parameters, presence of other ectoparasites) with the interaction of Amblyomma triste immature stages and one of its main hosts in Argentina, the rodent Akodon azarae. Monthly and for two years, we captured and sampled rodents at 16 points located at 4 different sites in the Parana River Delta region. The analyses were conducted with Generalized Linear Mixed Models with a negative binomial response (counts of larvae or nymphs). The independent variables assessed were: (a) environmental: trapping year, season, presence of cattle; type of vegetation (natural grassland or implanted forest); rodent abundance; (b) host parameters: body length; sex; body condition; blood cell counts; natural antibody titres; and (c) co-infestation with other ectoparasites: other stage of A. triste; Ixodes loricatus; lice; mites; and fleas. Two-way interaction terms deemed a priori as relevant were also included in the analysis. Larvae were affected by all environmental variables assessed and by the presence of other ectoparasites (lice, fleas and other tick species). Host factors significantly associated with larval count were sex and levels of natural antibodies. Nymphs were associated with season, presence of cattle, body condition, body length and with burdens of I. loricatus. In most cases, the direction and magnitude of the associations were context-dependent (many interaction terms were significant). The findings of greater significance and implications of our study are two. Firstly, as burdens of A. triste larvae and nymphs were greater where cattle were present, and larval tick burdens were higher in implanted forests, silvopastoral practices developing in the region may affect the population dynamics of A. triste, and consequently the eco-epidemiology of Rickettsia parkeri. Secondly, strong associations and numerous interactions with other ectoparasites suggest that co-infestations may be more important for tick dynamics than has so far been appreciated. EEA Rafaela Fil: Colombo, Valeria Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Laboratorio de Ecología de Enfermedades; Argentina Fil: Nava, Santiago. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Regional Agropecuaria Rafaela; Argentina Fil: Antoniazzi, Leandro Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Laboratorio de Ecología de Enfermedades; Argentina Fil: Monje, Lucas Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Laboratorio de Ecología de Enfermedades; Argentina Fil: Racca, Andrea Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Laboratorio de Ecología de Enfermedades; Argentina Fil: Guglielmone, Alberto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Regional Agropecuaria Rafaela; Argentina Fil: Beldomenico, Pablo Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Laboratorio de Ecología de Enfermedades; Argentina 2018-08-08T13:03:20Z 2018-08-08T13:03:20Z 2015-07-30 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://www.sciencedirect.com/science/article/pii/S0304401715002939 http://hdl.handle.net/20.500.12123/3012 0304-4017 https://doi.org/10.1016/j.vetpar.2015.06.012 eng info:eu-repo/semantics/restrictedAccess application/pdf Veterinary Parasitology 211 (3–4) : 251-258 (July 2015) |
| spellingShingle | Amblyomma Roedores Relaciones Huésped Parásito Parasitismo Enfermedades Transmitidas por Garrapatas Rodents Host Parasite Relations Parasitism Tickborne Diseases Amblyomma triste Garrapatas Colombo, Valeria Carolina Nava, Santiago Antoniazzi, Leandro Raúl Monje, Lucas Daniel Racca, Andrea Laura Guglielmone, Alberto Beldomenico, Pablo Martín Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host |
| title | Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host |
| title_full | Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host |
| title_fullStr | Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host |
| title_full_unstemmed | Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host |
| title_short | Factors affecting patterns of Amblyomma triste (Acari: Ixodidae) parasitism in a rodent host |
| title_sort | factors affecting patterns of amblyomma triste acari ixodidae parasitism in a rodent host |
| topic | Amblyomma Roedores Relaciones Huésped Parásito Parasitismo Enfermedades Transmitidas por Garrapatas Rodents Host Parasite Relations Parasitism Tickborne Diseases Amblyomma triste Garrapatas |
| url | https://www.sciencedirect.com/science/article/pii/S0304401715002939 http://hdl.handle.net/20.500.12123/3012 https://doi.org/10.1016/j.vetpar.2015.06.012 |
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