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Registros recuperados: 8
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Comportamento alimentar aquático de Liophis jaegeri (Günther 1858) (Serpentes, Dipsadidae) em cativeiro Biota Neotropica
Santos,Maurício Beux dos; Huckembeck,Sônia; Bergmann,Fabiane Borba; Tozetti,Alexandro Marques.
Os itens que compõem a dieta das espécies são peças fundamentais na definição de sua dimensão de nicho e interferem, em última análise, em processos de estruturação das comunidades. As necessidades relacionadas à alimentação direcionam o modo pelo qual as espécies usam o ambiente. Apesar de se tratar de uma espécie com ampla distribuição geográfica, existem poucos estudos a respeito da biologia geral e do comportamento alimentar de Liophis jaegeri. Os estudos disponíveis indicam se tratar de uma espécie associada à ambientes alagados, porém, a importância de presas aquáticas na dieta desta serpente tem recebido pouca atenção. Em geral os estudos disponíveis sugerem que a presença de presas aquáticas (peixes e girinos) no trato digestivo de indivíduos...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Predação; Serpentes; Comportamento; Cheirodon.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400039
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Defensive repertoire of Xenodon dorbignyi (Serpentes, Dipsadidae) Biota Neotropica
Tozetti,Alexandro Marques; Oliveira,Roberto Baptista de; Pontes,Glaucia Maria Funk.
The ability of a species to defend itself against a predator is directly correlated with its survivorship. Thus, prey/predator interaction mechanisms are important elements of the natural history of species. In this study, we examined the defensive repertoire of the South-American hognose snake (Xenodon dorbignyi) through simulations of predator attacks in the field. Nine defensive displays were observed. The most frequently observed displays were erratic movements, body flattening, head triangulation and tail display. No differences were detected in the defensive strategies shown by males and females, regardless of their reproductive state. Our findings suggest that X. dorbignyi has the ability to evaluate the level of threat imposed by the aggressor,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Defensive behavior; Predation; Snake; Display.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000300016
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Diversity and habitat use by snakes and lizards in coastal environments of southernmost Brazil Biota Neotropica
Santos,Maurício Beux dos; Oliveira,Mauro Cesar Lamim Martins de; Tozetti,Alexandro Marques.
This study examined species composition differences among snake and lizard assemblages from coastal dunes and restinga habitats in southernmost Brazil. Animals were collected between April 2009 and March 2010 using pitfall traps, artificial shelters, and time-constrained searches in grasslands areas susceptible to flooding. Species richness was higher in the restinga, but lower than the observed in other Brazilian biomes, possibly associated with more unstable microclimate conditions and low habitat complexity (vertical and horizontal distribution of the vegetation) in this habitat. This hypothesis is supported by the fact that the most abundant species of both snakes and lizards have fossorial habits. The assemblage of snakes is apparently mainly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diversity; Lizards; Restinga; Sand dunes; Snakes.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000300008
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Does human influence on coastal grasslands habitats affect predation pressure on snakes? Biota Neotropica
Santos,Mauricio Beux dos; Oliveira,Mauro Cesar Lamim Martins de; Gonçalves,Tatiane Penteado; Almeida,Francis de Mattos; Loebmann,Daniel; Tozetti,Alexandro Marques.
The loss and modification of habitats by humans have been considered key factors in the decline of diversity of species worldwide. However, the real effect caused by these disturbances on the biota is still poorly understood. The assessment of the changes in the network of interspecific interactions, such as predation rates on the native fauna, can be an important tool to diagnose the functionality of disturbed ecosystems. In this study we evaluate the predation rate on snakes in coastal grasslands in South America under human influence. Predation rate of artificial snakes, unlike that obtained in other studies, was lower in human-altered areas than preserved ones. Our findings may be due to a reduction in the abundance and/or richness of species of native...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reptiles; Coastal dunes; Human impact; Predation; Brazil.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100039
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Head triangulation as anti-predatory mechanism in snakes Biota Neotropica
Dell'Aglio,Denise Dalbosco; Toma,Tiago Shizen Pacheco; Muelbert,Adriane Esquivel; Sacco,Anne Gomes; Tozetti,Alexandro Marques.
Anti-predator mechanisms in snakes are diverse and complex, including mimetic behavior. Some snakes triangulate their head, probably mimicking other more dangerous snakes. However, there is a lack of studies that demonstrate the effectiveness of this behavior with natural predators. The aim of this study was to verify, using artificial snakes, if snakes with triangular heads are less susceptible to attack by predators, and if predatory attack is targeted to the head of serpents. Artificial snakes were systematically arranged on a road border. The rate of attacked models was 48.71%. Number of attacks on models with rounded head was significantly higher than in models with triangular head. There was a significant difference between the places of attack on...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Artificial models; Defensive behavior; Mimicry; Predation rate; Reptiles.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000300031
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Pequenos mamíferos não-voadores (Didelphimorphia, Rodentia) em campos litorâneos do extremo sul do Brasil Biota Neotropica
Quintela,Fernando Marques; Gonçalves,Bruno Igure; Trindade,Gabriel Eberts; Santos,Maurício Beux dos; Tozetti,Alexandro Marques.
Non-volant small mammals are key elements in natural environments due its importance as food resource. This study aimed to investigate the species composition and habitat occupancy by non-volant small mammals (Didelphimorphia, Rodentia) in a coastal grassland area in southern Rio Grande do Sul coastal plain. Between April 2009 and March 2010 pitffal traps were used to capture small mammals in coastal grasslands associated to sand dunes and arbustive Restinga. We sampled 180 individuals including two marsupials (Cryptonanus guahybae and Didelphis albiventris) and seven rodent species (Calomys laucha, Cavia aperea, Ctenomys flamarioni, Deltamys kempi, Oligoryzomys flavescens, Oxymycterus nasutus and Scapteromys tumidus). Cryptonanus guahybae, D. albiventris...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal environments; Marsupials; Rodents; Calomys laucha; Oligoryzomys flavescens; Assemblage.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000400284
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Playing dead to stay alive: death-feigning in Liolaemus occipitalis (Squamata: Liolaemidae) Biota Neotropica
Santos,Maurício Beux dos; Oliveira,Mauro Cesar Lamim Martins de; Verrastro,Laura; Tozetti,Alexandro Marques.
Predation is the major selective force that drives the development of a series of defense mechanisms by the species. These mechanisms are efficient in that it limits the ability of predators to detect, recognize and subdue their prey. In lizards for example, the tail loss and locomotor escape are the most common defensive behavior reported on the literature. Additionally, in response to external stimuli, some lizards exhibit a peculiar defensive behavior: death-feigning or thanatosis. Here we describe the first record of death-feigning in a population of Liolaemus occipitalis in a coastal sand dune habitat in Southernmost Brazil. A total of 86 individuals were tested. During handling 75.6% of lizards feigned death. The duration of this behavior was longer...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Thanatosis; Behavior; Sand-dune lizard; Pampa; Restinga.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000400043
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Reptile diversity of Sinos River Basin Biota Neotropica
Moser,Camila Fernanda; Avila,Fernanda Rodrigues de; Oliveira,Roberto Baptista de; Oliveira,Juliano Morales de; Borges-Martins,Márcio; Tozetti,Alexandro Marques.
Abstract This work aimed to catalog the species of reptiles of the Sinos River Basin based on records from scientific collections and data collected in the field. We recorded 65 species, including 46 snakes, nine lizards, five turtles, four amphisbaenians and one caiman. Snakes composed most of the recorded specimens (91.3%), and the three most representative are venomous and of medical importance. The most urban region of the basin (Lowland) has the highest number of records. This fact may be a reflection of the high human population density in this region, which would have favored the encounter of specimens and their sending to scientific collections and research centers. It is worth highlighting that most species with few specimens in the collections...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chelonia; Crocodilia; Squamata; Vale dos Sinos; Atlantic Forest; Pampa.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000300307
Registros recuperados: 8
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