6 results on '"Santos, Filipe"'
Search Results
2. The influence of abiotic and biotic variables on the patent parasitemias of Trypanosoma spp. in Thrichomys fosteri (Rodentia: Echimyidae) in the southern Pantanal.
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Santos, Filipe Martins, Sano, Nayara Yoshie, Liberal, Sany Caroline, Nantes, Wesley Arruda Gimenes, Sanabria, Isabel Passos Miranda, dos Santos, Geovanna Silva, Martinelli, Artur Luiz Araujo, de Oliveira, Carina Elisei, Almeida-Gomes, Mauricio, Jansen, Ana Maria, and Herrera, Heitor Miraglia
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TRYPANOSOMA , *RODENTS , *ARTHROPOD vectors , *PATENTS , *LOW temperatures - Abstract
Parasitism is a dynamic ecological phenomenon that is constantly influenced by the environment and intrinsic factors of the host. We aimed to evaluate the influence of vegetation, environmental temperature, reproductive conditions, sex, and body condition (BC) on the detection of Trypanosoma spp. in the blood of Thrichomys fosteri in the Pantanal region, an enzootic area for trypanosomiasis. Whole blood was collected from the tip of the tail, and nPCR was performed for Trypanosoma spp. detection from the DNA extracted from the resultant blood clot. Statistical analyses were performed using generalized linear models. Our results showed that there is a greater probability of detection of Trypanosoma spp. in the bloodstream of animals with the highest BC values in periods with mild temperatures. Since T.fosteri is an abundant and common prey for carnivores, even in periods with low temperatures and consequent decrease in the reproduction and activities of the blood-sucking arthropod vectors, the maintenance of Trypanosoma spp. in the studied area would be guaranteed via predation (trophic network) of T.fosteri individuals with good BC and patent parasitemia. Furthermore, T.fosteri, which displays Trypanosoma spp. in the bloodstream, would be reproducing adequately because we found no influence between the reproductive condition and the detection of Trypanosoma spp. in T. fosteri. The caviomorph rodent T.fostei is an important species for the maintenance of Trypanosoma spp. in the Pantanal biome. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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3. Relationships between vector-borne parasites and free-living mammals at the Brazilian Pantanal.
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Santos, Filipe Martins, de Sousa, Keyla Carstens Marques, Sano, Nayara Yoshie, Nantes, Wesley Arruda Gimenes, Liberal, Sany Caroline, Machado, Rosangela Zacarias, André, Marcos Rogério, and Herrera, Heitor Miraglia
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MAMMAL parasites , *HOST-parasite relationships , *PARASITIC diseases , *SERODIAGNOSIS , *RODENTS , *BABESIA - Abstract
In nature, parasitic infections must be addressed as complex systems involving parasite-host relationships on a temporal and spatial scale. Since the parasites cover a great biological diversity, we can expect that wildlife are exposed simultaneously to different parasites. In this sense, the objective of this work was to determine the relationships between free-living mammals and their associated hemoparasites in the Brazilian Pantanal. We used the data published during 2017 and 2018 by de Sousa et al. regarding the detection of vector-borne pathogens (VBP), namely Anaplasma, Babesia, Bartonella, Cytauxzoon, Ehrlichia, Hepatozoon, Mycoplasma, and Theileria, in nine species of free-living mammals belonging to orders Carnivora, Rodentia, and Didelphimorphia. We assume as infected an individual positive on any of parasitological, molecular, and/or serological tests. We observed a strong association between the wild felid Leopardus pardalis with Cytauxzoon, the wild canid Cerdocyon thous with Hepatozoon, the small rodent Thrichomys fosteri with Bartonella, and the procyonid Nasua nasua with Mycoplasma and Theileria. Therefore, N. nasua, C. thous, T. fosteri, and the small rodent Oecomys mamorae can be considered key species for the maintenance of selected VBP in the Pantanal region, because they showed a high number of single and coinfections. Together, our results highlighted the importance of coinfection as a common phenomenon in nature. [ABSTRACT FROM AUTHOR]
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- 2021
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4. Understory use by terrestrial small mammals in an unflooded forest patch in the Pantanal floodplain.
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Sano, Nayara Yoshie, Herrera, Heitor Miraglia, Porfirio, Grasiela Edith de Oliveira, and Santos, Filipe Martins
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FLOODPLAINS ,MAMMALS ,RODENTS ,SPECIES - Abstract
To date, there have been no studies that have evaluated small mammal utilization of the understory of forests. In this study, we described the use of vertical strata by small mammals in patches of unflooded forests, known as "cordilheiras", in the Nhecolândia sub-region of the Pantanal, Brazil. We collected all species using the ground and understory, including the terrestrial didelphid Monodelphis domestica. We suppose that local habitat features (e.g., Acuri palms), rather than intrinsic species characteristics, may be more conducive to the use of understory vegetation by small mammals in the Nhecolândia region. [ABSTRACT FROM AUTHOR]
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- 2021
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5. New species of Eimeria (Apicomplexa: Eimeriidae) from Thrichomys fosteri and Clyomys laticeps (Rodentia: Echimyidae) of the Brazilian Pantanal.
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Barreto, Wanessa, Santos, Filipe, Oliveira Porfírio, Grasiela, Oliveira, Michel, Herrera, Heitor, Andrade, Gisele, Viana, Lúcio, Perdomo, Alessandra, Silva, Alanderson, and Sousa, Keyla
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EIMERIA , *APICOMPLEXA , *EIMERIIDAE , *RODENTS , *COCCIDIA , *HISTOPATHOLOGY - Abstract
The echimyid rodents Thrichomys fosteri and Clyomys laticeps are among the most commonly recorded small mammals in the Pantanal wetland of Brazil. These species play important ecological roles since they are the basis of the food chain of some predators and are parasitized by some pathogens. Knowledge of the eimerians that parasitize echimyid rodents in Brazil is absent, and only one report is available for South America. We therefore investigated parasitism by coccidians in the echimyids T. fosteri and C. laticeps in the Pantanal. Using morphological and morphometric features and associated statistical analyses, we describe five new eimerian species parasitizing T. fosteri ( Eimeria nhecolandensis n. sp., Eimeria jansenae n. sp., and Eimeria fosteri n. sp.) and C. laticeps ( E. nhecolandensis n. sp. , Eimeria corumbaensis n. sp., and Eimeria laticeps n. sp.) in different types of infection associations. We document the developmental forms in the tissues, and describe lesions in the enteric tract of some infected animals. We also discuss some approaches regarding epidemiological and ecological data. Our results demonstrate that echimyid rodents in the Brazilian Pantanal are important hosts for the maintenance of enteric coccidia. Moreover, in some circumstances, this parasitism may threaten the health of the hosts. [ABSTRACT FROM AUTHOR]
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- 2017
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6. Low occurrence of Bartonella in synanthropic mammals and associated ectoparasites in peri-urban areas from Central-Western and Southern Brazil.
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Gonçalves, Luiz Ricardo, Harrus, Shimon, Herrera, Heitor Miraglia, Gutiérrez, Ricardo, Pedrassani, Daniela, Nantes, Wesley Arruda Gimenes, Santos, Filipe Martins, Porfírio, Grasiela Edith de Oliveira, Barreto, Wanessa Teixeira Gomes, de Macedo, Gabriel Carvalho, Assis, William de Oliveira, Campos, João Bosco Vilela, da Silva, Thiago Merighi Vieira, Biolchi, Juliano, de Sousa, Keyla Carstens Marques, Nachum-Biala, Yaarit, Barros-Battesti, Darci Moraes, Machado, Rosangela Zacarias, and André, Marcos Rogério
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ECTOPARASITES , *BARTONELLA , *ANIMAL traps , *MAMMALS , *RATS , *MARSUPIALS , *OPOSSUMS - Abstract
• Bartonella coopersplainsensis DNA was detected, for the first time, in Brazil. • Most screened mammal and ectoparasite DNA samples were negative for Bartonella spp. • Distinct ecological and biological factors might have influenced the prevalence observed. Worldwide, Bartonella species are known to infect a wide range of mammalian and arthropod hosts, including humans. The current study aimed to investigate the prevalence of Bartonella spp. in synanthropic mammals captured in peri-urban areas from Central-Western and Southern Brazil and their ectoparasites. For this aim, 160 mammals belonging to four species, and 218 associated arthropods were sampled. DNA was extracted and subjected to different Bartonella screening assays. Additionally, blood samples from 48 small rodents were submitted to liquid BAPGM culture followed by qPCR assay and solid culture. Two out of 55 Rattus captured in Santa Catarina state were PCR-positive for Bartonella when targeting the nuoG , 16S, and ITS loci. Sequences showed high homology with Bartonella coopersplainsensis. Conversely, all 48 small rodents, 14 capybaras and 43 opossum DNA samples from animals trapped in Mato Grosso do Sul were Bartonella negative in the HRM real time PCR assays targeting the ITS locus and gltA gene. Additionally, all mammal-associated ectoparasites showed negativity results based on HRM real time PCR assays. The present study showed, for the first time, the occurrence of B. coopersplainsensis in Brazil, shedding some light on the distribution of rats-related Bartonella in South America. In addition, the majority of rodents and marsupials were negative for Bartonella spp. Since B. coopersplainsensis reservoirs - Rattus spp. - are widely dispersed around the globe, their zoonotic potential should be further investigated. Image, graphical abstract [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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