Now showing items 1-10 of 24
Effects of temperature on lung and blood gases in the South American rattlesnake Crotalus durissus terrificus
(Comparative Biochemistry and Physiology A-molecular & Integrative Physiology, 1998-09-01) [Artigo]
The effects of temperature on lung and blood gases were measured in the South American rattlesnake (Crotalus durissus terrificus). Arterial blood and lung gas samples were obtained from chronically cannulated animals at ...
Torpor in three species of Brazilian hummingbirds under semi-natural conditions
(Condor, 1997-08-01) [Artigo]
We measured body temperatures in three species of Brazilian hummingbirds, the Versicolored Emerald (Amazilia versicolor; body mass 4.1 g), the Black Jacobin (Me lantrochilus fuscus; body mass 7.7 g) and the Swallow-tailed ...
DIET COMPOSITION OF 2 SYNTOPIC SPECIES OF NEOTROPICAL AMPHISBAENIANS, CERCOLOPHIA-ROBERTI AND AMPHISBAENA-MERTENSII
(Journal of Herpetology, 1993-06-01) [Artigo]
Foam nest production in the armoured catfish
(Journal of Fish Biology, 1997-03-01) [Artigo]
Foam nest production in Hoplosternum littorale is described in detail. This fish produces foam, while swimming belly-up, by pumping water over the gills and using their pelvic fins to mix water and mucus. The bubbles ...
Tolerance to high temperatures in tadpoles of Leptodactylus fuscus and Hyla fuscovaria in temporary ponds (Amphibia, Leptodactylidae, Hylidae)
(Zoologischer Anzeiger, 1991-12-01) [Artigo]
In temporary ponds tadpoles of the frogs Leptodactylus fuscus and Hyla fuscovaria may be exposed to temperatures up to 40-44°C. Experimental exposure to high temperature revealed survivals after 30 min at 42°C for H. ...
Relationship of venom ontogeny and diet in Bothrops
(Herpetologica, 1999-06-01) [Artigo]
We studied ontogenetic changes in venom toxicity of the pitvipers Bothrops jararaca and B. alternatus in order to evaluate the relationship between venom action and diet. Toxicity tests (LD50) were performed for the venoms ...
AN ELECTROPHORETIC APPROACH TO THE RELATIONSHIPS AMONG THE SUBSPECIES OF THE LANCEHEAD BOTHROPS-NEUWIEDI (SERPENTES, VIPERIDAE)
(Zoologischer Anzeiger, 1991-01-01) [Artigo]
Bothrops neuwiedi is a lancehead with twelve recognized subspecies and a wide geographic distribution through South America. The relationships among six subspecies of B. neuwiedi were studied by means of plasma electrophoresis. ...
RESPONSE TO TEMPERATURE IN THE OXYGEN-UPTAKE OF AWAKE AND DORMANT FROGS (AMPHIBIA, LEPTODACTYLIDAE)
(Studies on Neotropical Fauna and Environment, 1991-01-01) [Artigo]
In southeastern Brazil the leptodactylid frogs Leptodactylus fuscus and Physalaemus fuscomaculatus enter dormancy during the dry season. Oxygen uptake was measured in awake and dormant groups of both species in a temperature ...
Allometry and morphological integration in the skull of Tupinambis merianae (Lacertilia: Teiidae)
(Amphibia Reptilia, 1997-11-01) [Artigo]
The morphogenetic processes acting in the skull of the lizard Tupinambis merianae were investigated by geometric morphometric techniques. The observed ontogenetic shape change involved a widening of the anterior extremity, ...