Renicolids are parasites that inhabit the renal tubules and ureters of molluscivorous and piscivorous birds. Puffinus puffinus is a migratory seabird that was identified as the definitive host of Renicola spp. Studies focusing on the renicolid species and the resulting renal lesions are valuable for their association with causes of stranding in seabirds. The aim of this study was to identify the renicolid trematodes and evaluate the histological findings in two P. puffinus stranded on the coast of Paraná state, Brazil. The parasites were evaluated by histologic, ultrastructural and molecular assays, while tissue changes were analyzed by histologic methods. The morphological and morphometrical characteristics of the parasites, along with polymerase chain reaction and sequencing assays (ribosomal and mitochondrial regions), identified the species as Renicola sloanei. The results also suggest that this helminth can be the adult form of Cercaria pythionike. The dilation of collecting ducts was the main histological finding in the kidneys. In conclusion, R. sloanei was identified, and for the first time, P. puffinus was described as a host of this digenean inducing mild renal changes.
Cetacean morbillivirus (CeMV) was identified as the etiologic agent of several epizootic episodes worldwide. Most of these studies are based on unusual mortality events or identification of new viral strains. We investigated the occurrence of CeMV under non-epizootic circumstances at a world heritage in Southern Brazil by a combination of pathologic, immunohistochemical and molecular assays. From 325 stranded cetaceans, 40 were included. Guiana dolphin (Sotalia guianensis) was the most frequent species. Interstitial pneumonia and non-suppurative encephalitis were the main pathologic findings associated with CeMV infection. Intracytoplasmic immunolabelling anti-CeMV was observed mainly in lungs and lymph nodes. All samples were negative in reverse transcription polymerase chain reaction assay. Diagnosis of CeMV is challenging in areas where epizootic episodes have not been recorded and due to postmortem changes. We observed a CeMV prevalence of 27.5%. The results described here increase the knowledge about CeMV under non-epizootic conditions in Brazil and worldwide.
The study of helminths can supply information about the ecology of their hosts and support evaluations of population stocks, migration patterns and trophic ecology. However, little is known about the parasites of Chelonia mydas, a globally distributed endangered species, along the Brazilian coast. Here we present a review of the literature of helminth species found in green turtles along the Brazilian coast, considering their global distribution, their infection sites and their other host species. The findings show that in recent years there has been a large increase in the number of studies reporting the parasitic species of these turtles in Brazil, which consequently increased the parasite species list of the green turtle. The helminth fauna of green turtles from Brazil is composed of 31 species of digenetic trematodes of seven families, and four species of nematodes of two families. Two of these helminths species are endemic, while 33 are widely distributed. They are concentrated in particular regions, although the observed distribution is likely related to the main research centers and not the actual geographical distribution of the species. Endemism was observed only for the digenean Ruicephalus minutus and for the nematoda Tonaudia freitasi.
Cetacean morbillivirus (CeMV) was identified as the etiologic agent of several epizootic episodes worldwide. Most of these studies are based on unusual mortality events or identification of new viral strains. We investigated the occurrence of CeMV under non-epizootic circumstances at a world heritage in Southern Brazil by a combination of pathologic, immunohistochemical and molecular assays. From 325 stranded cetaceans, 40 were included. Guiana dolphin (Sotalia guianensis) was the species most frequent. Interstitial pneumonia and non-suppurative encephalitis were the main pathologic findings associated to CeMV infection. Intracytoplasmic immunolabeling anti-CeMV was observed mainly in lungs and lymph nodes. All samples were negative in RT-PCR assay. Diagnosis of CeMV is challenging in areas where epizootic episodes have not been recorded and due to postmortem changes. We observed a CeMV prevalence of 27.5%. The results described here increase the knowledge about CeMV under non-epizootic conditions in Brazil.
O Pantanal é constituído por diferentes formações vegetacionais, entre elas o Paratudal e a Mata Ciliar. Este trabalho objetivou analisar comparativamente essas duas formações, e o ecótono entre elas, quanto à diversidade e similaridade. O estudo foi desenvolvido na região do Passo do Lontra, às margens do rio Miranda, MS. Foram estabelecidas cinco parcelas de 10 x 10m em cada área e nelas todos os indivíduos acima de 1m de altura foram contados e identificados. AbstractThe Pantanal consists of different vegetation types, including the Paratudal, a monodominat floodable savanna, and Riparian vegetation. This study aimed to analyze diversity and similarity in samples of these two vegetations, and its ecotone. The study was developed in the region of Passo do Lontra, at the Miranda river margins. Five plots 10 x 10m, were allocated in each area, where all individuals above 1m height were counted and identified. Nine hundred and thirteen individuals were registered, distributed in 70 taxa, of which 60 were identified in species level. The Shannon diversity index (H') was 2.
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