ABSTRACT
We described the feeding habits of Colomesus asellus from riverbanks of the upper-middleTocantins River, Central Brazil. Two sampling expeditions were carried out in August (dry season) and inOctober (rainy season) of 2013, downstream from the Lajeado Hydroelectric Power Plant, Tocantins state.The diet of C. asellus was characterized and compared between juveniles and adults and betweenindividuals captured in the dry season and in the rainy season. Individuals exhibited marked temporalsegregation, with a predominance of adults on the riverbanks during the dry season and the predominanceof juveniles in the rainy season. The diet of this species was based on diverse benthic prey, mostlyEphemeroptera nymphs (Insecta). Contrary to our expectations, the diet composition of C. asellus was notinfluenced by seasonal changes or ontogenetic factors, but the size of individuals determined the numberof prey consumed. Thus, C. asellus can be classified in its trophic ecology as an insectivore without relationwith fish size and seasonality.
Descrevemos os hábitos alimentares de Colomesus asellus capturados nas margens do rioTocantins, Brasil Central. Duas expedições de coleta foram realizadas em agosto (estação seca) e emoutubro (estação chuvosa) de 2013, a jusante da Usina Hidrelétrica de Lajeado, Estado do Tocantins. Adieta de C. asellus foi caracterizada e comparada entre juvenis e adultos e entre indivíduos capturados naestação seca e na estação chuvosa. Os indivíduos apresentaram marcada segregação temporal, compredominância de adultos nas margens do rio durante a estação seca e predominância de juvenis na estaçãochuvosa. A dieta desta espécie foi baseada em diversas presas bentônicas, principalmente ninfas deEphemeroptera (Insecta). Contrariamente às nossas expectativas, a composição da dieta de C. asellus não foiinfluenciada por mudanças sazonais ou fatores ontogenéticos, mas o tamanho dos indivíduos determinou onúmero de presas consumidas. Assim, a espécie pode ser classificada como insetívora, sem variação em suaecologia trófica relacionada à sazonalidade do ambiente ou ao seu tamanho.
Subject(s)
Animals , Feeding Behavior , Tetraodontiformes/genetics , Tetraodontiformes/metabolism , SeasonsABSTRACT
We described the feeding habits of Colomesus asellus from riverbanks of the upper-middleTocantins River, Central Brazil. Two sampling expeditions were carried out in August (dry season) and inOctober (rainy season) of 2013, downstream from the Lajeado Hydroelectric Power Plant, Tocantins state.The diet of C. asellus was characterized and compared between juveniles and adults and betweenindividuals captured in the dry season and in the rainy season. Individuals exhibited marked temporalsegregation, with a predominance of adults on the riverbanks during the dry season and the predominanceof juveniles in the rainy season. The diet of this species was based on diverse benthic prey, mostlyEphemeroptera nymphs (Insecta). Contrary to our expectations, the diet composition of C. asellus was notinfluenced by seasonal changes or ontogenetic factors, but the size of individuals determined the numberof prey consumed. Thus, C. asellus can be classified in its trophic ecology as an insectivore without relationwith fish size and seasonality.(AU)
Descrevemos os hábitos alimentares de Colomesus asellus capturados nas margens do rioTocantins, Brasil Central. Duas expedições de coleta foram realizadas em agosto (estação seca) e emoutubro (estação chuvosa) de 2013, a jusante da Usina Hidrelétrica de Lajeado, Estado do Tocantins. Adieta de C. asellus foi caracterizada e comparada entre juvenis e adultos e entre indivíduos capturados naestação seca e na estação chuvosa. Os indivíduos apresentaram marcada segregação temporal, compredominância de adultos nas margens do rio durante a estação seca e predominância de juvenis na estaçãochuvosa. A dieta desta espécie foi baseada em diversas presas bentônicas, principalmente ninfas deEphemeroptera (Insecta). Contrariamente às nossas expectativas, a composição da dieta de C. asellus não foiinfluenciada por mudanças sazonais ou fatores ontogenéticos, mas o tamanho dos indivíduos determinou onúmero de presas consumidas. Assim, a espécie pode ser classificada como insetívora, sem variação em suaecologia trófica relacionada à sazonalidade do ambiente ou ao seu tamanho.(AU)
Subject(s)
Animals , Tetraodontiformes/genetics , Tetraodontiformes/metabolism , Feeding Behavior , SeasonsABSTRACT
Although Eptesicus furinalis presents a widely distribution in Latin America little is known about the ecological aspects of this taxon. This paper reports the capture of three colonies of E. furinalis in Rio de Janeiro State. The colonies occupied human constructions located at altitudes above 800 m. In the three refuges occurred cohabitation with Molossus molossus and size of the colonies ranged from 2 to 33 individuals. Neonates were found in November in one of the roosts. The results show the importance of roost sampled to understand the biology of species that are under sampled in surveys using mist nets.
Apesar de Eptesicus furinalis apresentar-se amplamente distribuída na América Latina pouco se sabe a respeito de aspectos ecológicos desse táxon. Este trabalho relata a captura de três colônias de E. furinalis no Estado do Rio de Janeiro. As colônias ocupavam construções humanas localizadas em altitudes superiores a 800 m. Nos três refúgios ocorreu a coabitação com Molossus molossus (Pallas, 1766) e o tamanho das colônias variou de 2 a 33 indivíduos. Foram encontrados neonatos no mês de novembro em um dos refúgios. Os resultados demonstram a relevância de amostrar refúgios para conhecer a biologia de espécies que são pouco amostradas em inventários realizados com redes de neblina.
ABSTRACT
Although Eptesicus furinalis presents a widely distribution in Latin America little is known about the ecological aspects of this taxon. This paper reports the capture of three colonies of E. furinalis in Rio de Janeiro State. The colonies occupied human constructions located at altitudes above 800 m. In the three refuges occurred cohabitation with Molossus molossus and size of the colonies ranged from 2 to 33 individuals. Neonates were found in November in one of the roosts. The results show the importance of roost sampled to understand the biology of species that are under sampled in surveys using mist nets.
Apesar de Eptesicus furinalis apresentar-se amplamente distribuída na América Latina pouco se sabe a respeito de aspectos ecológicos desse táxon. Este trabalho relata a captura de três colônias de E. furinalis no Estado do Rio de Janeiro. As colônias ocupavam construções humanas localizadas em altitudes superiores a 800 m. Nos três refúgios ocorreu a coabitação com Molossus molossus (Pallas, 1766) e o tamanho das colônias variou de 2 a 33 indivíduos. Foram encontrados neonatos no mês de novembro em um dos refúgios. Os resultados demonstram a relevância de amostrar refúgios para conhecer a biologia de espécies que são pouco amostradas em inventários realizados com redes de neblina.
ABSTRACT
Morcegos possuem poucos predadores eficientes que seriam capazes de provocar perdas expressivas em suas populações (Altringham 1996). Na grande maioria dos estudos sobre a predação em morcegos observa-se que essa interação ocorre de modo ocasional e oportunístico. Segundo Altringham (1996), apenas aves e serpentes parecem ser predadores regulares de morcegos com capacidade de afetar as populações deste grupo.
ABSTRACT
Morcegos possuem poucos predadores eficientes que seriam capazes de provocar perdas expressivas em suas populações (Altringham 1996). Na grande maioria dos estudos sobre a predação em morcegos observa-se que essa interação ocorre de modo ocasional e oportunístico. Segundo Altringham (1996), apenas aves e serpentes parecem ser predadores regulares de morcegos com capacidade de afetar as populações deste grupo.
ABSTRACT
Species of sheath-tailed bats in the family Emballonuridae are pantropical in distribution. Ghost bats in the genus Diclidurus (Wied-Neuwied, 1820) comprehend four species that occur in the Neotropical regions of Central and South America. However, distributional records are sparsely documented across this vast area. The objective of this study is to report the first occurrence of D. ingens in Central Brazil, representing a range extension of 850 kilometers.
Espécies de morcegos da familia Emballonuridae são pantropicais. No gênero Diclidurus (Wied-Neuwied, 1820) quatro espécies tem ocorrência nas Américas Central e do Sul. Os registros de ocorrências dessas espécies são esparsamente documentados ao longo dessa vasta distribuição. O objetivo desse estudo é comunicar a primeira ocorrência de D. ingens para o Brasil Central, representando uma extensão de 850 quilômetros na distribuição de D. ingens para o sul do país.
ABSTRACT
Rabies is caused by rabies virus (RV), a RNA virus member of the Lyssavirus genus, family Rhabdoviridae. The aim of this study was to determine antigenic characteristics of a rabies virus isolate (RV183-07) recovered from a stray bitch that died of rabies and to infer the most likely source of contamination, since no urban rabies has been reported in the area in more than 20 years. The virus was identified by direct immunofluorescence and multiplied by one passage in mice. The antigenic profile of the isolate was determined with a panel of monoclonal antibodies to lyssavirus antigens on infected brain tissues. A fragment of the viral genome corresponding to the nucleoprotein (N) gene was submitted to reverse transcription/polymerase chain reaction and the amplicon obtained was subjected to restriction enzyme analysis. A 303 base pair fragment of the N gene was cloned, sequenced and compared to other RV sequences available at Genbank. The isolate RV183-07 displayed antigenic and genomic characteristics of rabies virus variants whose natural reservoir is the non-hematophagous bat Tadarida brasiliensis. Therefore, the most likely source of contamination of the bitch was an incidental contact with an infected bat of that species, common inhabitants of the area. In view of that, the status of urban rabies-free of the area was not compromised.
ABSTRACT
Rabies is caused by rabies virus (RV), a RNA virus member of the Lyssavirus genus, family Rhabdoviridae. The aim of this study was to determine antigenic characteristics of a rabies virus isolate (RV183-07) recovered from a stray bitch that died of rabies and to infer the most likely source of contamination, since no urban rabies has been reported in the area in more than 20 years. The virus was identified by direct immunofluorescence and multiplied by one passage in mice. The antigenic profile of the isolate was determined with a panel of monoclonal antibodies to lyssavirus antigens on infected brain tissues. A fragment of the viral genome corresponding to the nucleoprotein (N) gene was submitted to reverse transcription/polymerase chain reaction and the amplicon obtained was subjected to restriction enzyme analysis. A 303 base pair fragment of the N gene was cloned, sequenced and compared to other RV sequences available at Genbank. The isolate RV183-07 displayed antigenic and genomic characteristics of rabies virus variants whose natural reservoir is the non-hematophagous bat Tadarida brasiliensis. Therefore, the most likely source of contamination of the bitch was an incidental contact with an infected bat of that species, common inhabitants of the area. In view of that, the status of urban rabies-free of the area was not compromised.
ABSTRACT
Rabies is caused by rabies virus (RV), a RNA virus member of the Lyssavirus genus, family Rhabdoviridae. The aim of this study was to determine antigenic characteristics of a rabies virus isolate (RV183-07) recovered from a stray bitch that died of rabies and to infer the most likely source of contamination, since no urban rabies has been reported in the area in more than 20 years. The virus was identified by direct immunofluorescence and multiplied by one passage in mice. The antigenic profile of the isolate was determined with a panel of monoclonal antibodies to lyssavirus antigens on infected brain tissues. A fragment of the viral genome corresponding to the nucleoprotein (N) gene was submitted to reverse transcription/polymerase chain reaction and the amplicon obtained was subjected to restriction enzyme analysis. A 303 base pair fragment of the N gene was cloned, sequenced and compared to other RV sequences available at Genbank. The isolate RV183-07 displayed antigenic and genomic characteristics of rabies virus variants whose natural reservoir is the non-hematophagous bat Tadarida brasiliensis. Therefore, the most likely source of contamination of the bitch was an incidental contact with an infected bat of that species, common inhabitants of the area. In view of that, the status of urban rabies-free of the area was not compromised.
ABSTRACT
Rabies is caused by rabies virus (RV), a RNA virus member of the Lyssavirus genus, family Rhabdoviridae. The aim of this study was to determine antigenic characteristics of a rabies virus isolate (RV183-07) recovered from a stray bitch that died of rabies and to infer the most likely source of contamination, since no urban rabies has been reported in the area in more than 20 years. The virus was identified by direct immunofluorescence and multiplied by one passage in mice. The antigenic profile of the isolate was determined with a panel of monoclonal antibodies to lyssavirus antigens on infected brain tissues. A fragment of the viral genome corresponding to the nucleoprotein (N) gene was submitted to reverse transcription/polymerase chain reaction and the amplicon obtained was subjected to restriction enzyme analysis. A 303 base pair fragment of the N gene was cloned, sequenced and compared to other RV sequences available at Genbank. The isolate RV183-07 displayed antigenic and genomic characteristics of rabies virus variants whose natural reservoir is the non-hematophagous bat Tadarida brasiliensis. Therefore, the most likely source of contamination of the bitch was an incidental contact with an infected bat of that species, common inhabitants of the area. In view of that, the status of urban rabies-free of the area was not compromised.
ABSTRACT
Rabies is caused by rabies virus (RV), a RNA virus member of the Lyssavirus genus, family Rhabdoviridae. The aim of this study was to determine antigenic characteristics of a rabies virus isolate (RV183-07) recovered from a stray bitch that died of rabies and to infer the most likely source of contamination, since no urban rabies has been reported in the area in more than 20 years. The virus was identified by direct immunofluorescence and multiplied by one passage in mice. The antigenic profile of the isolate was determined with a panel of monoclonal antibodies to lyssavirus antigens on infected brain tissues. A fragment of the viral genome corresponding to the nucleoprotein (N) gene was submitted to reverse transcription/polymerase chain reaction and the amplicon obtained was subjected to restriction enzyme analysis. A 303 base pair fragment of the N gene was cloned, sequenced and compared to other RV sequences available at Genbank. The isolate RV183-07 displayed antigenic and genomic characteristics of rabies virus variants whose natural reservoir is the non-hematophagous bat Tadarida brasiliensis. Therefore, the most likely source of contamination of the bitch was an incidental contact with an infected bat of that species, common inhabitants of the area. In view of that, the status of urban rabies-free of the area was not compromised.
ABSTRACT
Rabies is caused by rabies virus (RV), a RNA virus member of the Lyssavirus genus, family Rhabdoviridae. The aim of this study was to determine antigenic characteristics of a rabies virus isolate (RV183-07) recovered from a stray bitch that died of rabies and to infer the most likely source of contamination, since no urban rabies has been reported in the area in more than 20 years. The virus was identified by direct immunofluorescence and multiplied by one passage in mice. The antigenic profile of the isolate was determined with a panel of monoclonal antibodies to lyssavirus antigens on infected brain tissues. A fragment of the viral genome corresponding to the nucleoprotein (N) gene was submitted to reverse transcription/polymerase chain reaction and the amplicon obtained was subjected to restriction enzyme analysis. A 303 base pair fragment of the N gene was cloned, sequenced and compared to other RV sequences available at Genbank. The isolate RV183-07 displayed antigenic and genomic characteristics of rabies virus variants whose natural reservoir is the non-hematophagous bat Tadarida brasiliensis. Therefore, the most likely source of contamination of the bitch was an incidental contact with an infected bat of that species, common inhabitants of the area. In view of that, the status of urban rabies-free of the area was not compromised.