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1.
Zoologia (Curitiba, Impr.) ; 35: 1-5, 2018. ilus, graf
Artigo em Inglês | VETINDEX | ID: biblio-1504484

Resumo

We investigated the daily activity and thermoregulatory body orientation of Mabuya macrorhyncha (Hoge, 1947), a lizard species that occurs in the Brazilian Atlantic Forest. We conducted this investigation in a sandy coastal dune remnant (restinga ecosystem) in Grussaí, state of Rio de Janeiro, Brazil, during the summer. The daily activity cycle of the lizards started around 6:00 am and ended before 7:00 pm. This is longer than observed in other populations of M. macrorhyncha (approximately 7:00 am to 5:00 pm). The activity cycle of the lizards was bimodal, with the first peak between 6:00 and 11:00 am and the second from 2:00 to 7:00 pm. This contrasts with observations on other populations of this species, which revealed an unimodal pattern. The mean body temperature of M. macrorhyncha in Grussaí was 34.2 ± 1.5 °C, which was comparatively higher than observed in other populations of the species. The differences in the daily activity and of body temperature of these lizards between our study and previous studies on this species may reflect environmental thermal conditions. The mean air and mean substrate temperatures when individuals were active were 27.8 and 30.5 °C respectively. Lizard orientation was significantly correlated with the direction of the solar incidence, suggesting that solar radiation, and particularly behavioral adjustments that maximize exposure to the sun, are important for the thermoregulation of M. macrorhyncha. Circular structures at the site, such as bromeliads, offer microhabitats with different orientations to the sunlight, favoring lizard thermoregulatory behaviors.


Assuntos
Animais , Ciclos de Atividade , Lagartos , Orientação Espacial , Regulação da Temperatura Corporal , Brasil , Comportamento Animal , Áreas Alagadas
2.
Zoologia (Curitiba) ; 35: 1-5, 2018. ilus, graf
Artigo em Inglês | VETINDEX | ID: vti-18387

Resumo

We investigated the daily activity and thermoregulatory body orientation of Mabuya macrorhyncha (Hoge, 1947), a lizard species that occurs in the Brazilian Atlantic Forest. We conducted this investigation in a sandy coastal dune remnant (restinga ecosystem) in Grussaí, state of Rio de Janeiro, Brazil, during the summer. The daily activity cycle of the lizards started around 6:00 am and ended before 7:00 pm. This is longer than observed in other populations of M. macrorhyncha (approximately 7:00 am to 5:00 pm). The activity cycle of the lizards was bimodal, with the first peak between 6:00 and 11:00 am and the second from 2:00 to 7:00 pm. This contrasts with observations on other populations of this species, which revealed an unimodal pattern. The mean body temperature of M. macrorhyncha in Grussaí was 34.2 ± 1.5 °C, which was comparatively higher than observed in other populations of the species. The differences in the daily activity and of body temperature of these lizards between our study and previous studies on this species may reflect environmental thermal conditions. The mean air and mean substrate temperatures when individuals were active were 27.8 and 30.5 °C respectively. Lizard orientation was significantly correlated with the direction of the solar incidence, suggesting that solar radiation, and particularly behavioral adjustments that maximize exposure to the sun, are important for the thermoregulation of M. macrorhyncha. Circular structures at the site, such as bromeliads, offer microhabitats with different orientations to the sunlight, favoring lizard thermoregulatory behaviors.(AU)


Assuntos
Animais , Lagartos , Regulação da Temperatura Corporal , Ciclos de Atividade , Orientação Espacial , Comportamento Animal , Áreas Alagadas , Brasil
3.
R. bras. Zoo. ; 15(1/3): 91-96, 2013. tab, graf
Artigo em Inglês | VETINDEX | ID: vti-26827

Resumo

Ocypode quadrata is a crab species distributed from United States of America to Brazil which is frequently found in supratidal zones of sandy beaches, where they built burrows. The counting of the number of burrows allows sample of both population densities and spatial distribution of individuals. To study these parameters of O. quadrata in Vila Dois Rios, southeastern Brazil, were delimited plots (3.14 m2) to distances from nearest backshore vegetation that varied from 1 to 10 m (60 plots = 188.4 m2). Burrows density in Vila Dois Rios was 0.67 burrows/m2 (126 burrows). The density of burrows of this species might vary influenced by local environmental factors (e.g. tides). The distances of the burrows from the vegetation and the diameter of its openings averaged 357.1 ± 272.7 cm (N = 83) and 15.1 ± 8.3 mm (N = 83), respectively. Larger burrow openings were built near thevegetation. It is possible that larger-sized individuals might exclude smaller ones from this region which may have more protection against energy of tides and flooding and a potential higher availability of food resources. Moreover, smaller-sized crabs might occupy areas near the sea due to lesser capacity of excavation than adults and/or to avoid the risk of desiccation due to their high surface/volume ratio. This study in Vila Dois Rios reinforces the occurrence of the construction of burrows near to the vegetation by larger O. quadrata.(AU)


Ocypode quadrata é uma espécie de caranguejo distribuída desde os Estados Unidos da América até o Brasil frequentemente encontrada em zonas supratidais de praias arenosas, onde constroem tocas. A contagem do número de tocas permite amostrar densidades populacionais e a distribuição espacial dos indivíduos. Para estudar estes parâmetros de O. quadrata em Vila Dois Rios, sudeste do Brasil, foram delimitadas parcelas (3.14 m2) a distâncias a partir davegetação pós-praia que variaram de 1 a 10 m (60 plots = 188.4 m2). A densidade de tocas em Vila Dois Rios foi de 0.67 tocas/m2(126 tocas). A densidade de tocas desta espécie pode variar influenciada por fatores ambientais locais (e.g. marés). A distância dos abrigos a partir da vegetação pós-praia e a largura das aberturas dos abrigos mediram 357,1 ± 272,7 cm (N = 83) e 15,1 ± 8,3mm (N = 83), respectivamente. Tocas com aberturas maiores foram construídas próximas à vegetação. É possível que indivíduos maiores possam excluir aqueles menores desta região que oferece maior proteção contra a energia das marés e inundações e uma potencial maior disponibilidade de recursos alimentares. Além disso, caranguejos menores podem ocupar áreas mais próximas ao mar devido à sua menor capacidade de escavação do que a de adultos e/ou para evitar os riscos de dessecação devido à sua relativa maior relação superfície/volume. Este estudo em Vila Dois Rios reforça a ocorrência da construção de tocas próximas à vegetação por indivíduos maiores O. quadrata.(AU)


Assuntos
Animais , Decápodes , Distribuição Animal
4.
Revista Brasileira de Zoociências (Online) ; 15(1/3): 91-96, 2013. tab, graf
Artigo em Inglês | VETINDEX | ID: biblio-1494595

Resumo

Ocypode quadrata is a crab species distributed from United States of America to Brazil which is frequently found in supratidal zones of sandy beaches, where they built burrows. The counting of the number of burrows allows sample of both population densities and spatial distribution of individuals. To study these parameters of O. quadrata in Vila Dois Rios, southeastern Brazil, were delimited plots (3.14 m2) to distances from nearest backshore vegetation that varied from 1 to 10 m (60 plots = 188.4 m2). Burrows’ density in Vila Dois Rios was 0.67 burrows/m2 (126 burrows). The density of burrows of this species might vary influenced by local environmental factors (e.g. tides). The distances of the burrows from the vegetation and the diameter of its openings averaged 357.1 ± 272.7 cm (N = 83) and 15.1 ± 8.3 mm (N = 83), respectively. Larger burrow openings were built near thevegetation. It is possible that larger-sized individuals might exclude smaller ones from this region which may have more protection against energy of tides and flooding and a potential higher availability of food resources. Moreover, smaller-sized crabs might occupy areas near the sea due to lesser capacity of excavation than adults and/or to avoid the risk of desiccation due to their high surface/volume ratio. This study in Vila Dois Rios reinforces the occurrence of the construction of burrows near to the vegetation by larger O. quadrata.


Ocypode quadrata é uma espécie de caranguejo distribuída desde os Estados Unidos da América até o Brasil frequentemente encontrada em zonas supratidais de praias arenosas, onde constroem tocas. A contagem do número de tocas permite amostrar densidades populacionais e a distribuição espacial dos indivíduos. Para estudar estes parâmetros de O. quadrata em Vila Dois Rios, sudeste do Brasil, foram delimitadas parcelas (3.14 m2) a distâncias a partir davegetação pós-praia que variaram de 1 a 10 m (60 plots = 188.4 m2). A densidade de tocas em Vila Dois Rios foi de 0.67 tocas/m2(126 tocas). A densidade de tocas desta espécie pode variar influenciada por fatores ambientais locais (e.g. marés). A distância dos abrigos a partir da vegetação pós-praia e a largura das aberturas dos abrigos mediram 357,1 ± 272,7 cm (N = 83) e 15,1 ± 8,3mm (N = 83), respectivamente. Tocas com aberturas maiores foram construídas próximas à vegetação. É possível que indivíduos maiores possam excluir aqueles menores desta região que oferece maior proteção contra a energia das marés e inundações e uma potencial maior disponibilidade de recursos alimentares. Além disso, caranguejos menores podem ocupar áreas mais próximas ao mar devido à sua menor capacidade de escavação do que a de adultos e/ou para evitar os riscos de dessecação devido à sua relativa maior relação superfície/volume. Este estudo em Vila Dois Rios reforça a ocorrência da construção de tocas próximas à vegetação por indivíduos maiores O. quadrata.


Assuntos
Animais , Decápodes , Distribuição Animal
5.
Artigo em Inglês | VETINDEX | ID: vti-690373

Resumo

We analyzed the feeding habits, microhabitat use, and daily activity period of the anuran species Cycloramphus brasiliensis (Steindachner, 1864), endemic to the Atlantic Rainforest biome. The only previous studies on this species focused on the systematics and new altitudinal records. This study was conducted in a large forest remnant located in the municipalities of Guapimirim and Cachoeiras de Macacu. We captured frogs through visual encounter surveys and recorded the frequency of microhabitat types used by them, and the time of capture. Diet was analyzed in terms of number, volume and frequency of occurrence of items. Individuals of C. brasiliensis occurred in association with fast-moving rocky portions of clear freshwater rivers, indicating a rheophilic habit, and were active mainly at night. Such as most anuran species, the diet of Cycloramphus brasiliensis was mainly based on arthropods, and included Blattodea, Formicidae, and Coleoptera as most important prey items.

6.
Artigo em Inglês | LILACS-Express | VETINDEX | ID: biblio-1504083

Resumo

We analyzed the feeding habits, microhabitat use, and daily activity period of the anuran species Cycloramphus brasiliensis (Steindachner, 1864), endemic to the Atlantic Rainforest biome. The only previous studies on this species focused on the systematics and new altitudinal records. This study was conducted in a large forest remnant located in the municipalities of Guapimirim and Cachoeiras de Macacu. We captured frogs through visual encounter surveys and recorded the frequency of microhabitat types used by them, and the time of capture. Diet was analyzed in terms of number, volume and frequency of occurrence of items. Individuals of C. brasiliensis occurred in association with fast-moving rocky portions of clear freshwater rivers, indicating a rheophilic habit, and were active mainly at night. Such as most anuran species, the diet of Cycloramphus brasiliensis was mainly based on arthropods, and included Blattodea, Formicidae, and Coleoptera as most important prey items.

7.
Artigo em Inglês | VETINDEX | ID: vti-441365

Resumo

We analyzed the feeding habits, microhabitat use, and daily activity period of the anuran species Cycloramphus brasiliensis (Steindachner, 1864), endemic to the Atlantic Rainforest biome. The only previous studies on this species focused on the systematics and new altitudinal records. This study was conducted in a large forest remnant located in the municipalities of Guapimirim and Cachoeiras de Macacu. We captured frogs through visual encounter surveys and recorded the frequency of microhabitat types used by them, and the time of capture. Diet was analyzed in terms of number, volume and frequency of occurrence of items. Individuals of C. brasiliensis occurred in association with fast-moving rocky portions of clear freshwater rivers, indicating a rheophilic habit, and were active mainly at night. Such as most anuran species, the diet of Cycloramphus brasiliensis was mainly based on arthropods, and included Blattodea, Formicidae, and Coleoptera as most important prey items.

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