Conrado A. B. Galdino
Pontifícia Universidade Católica de Minas Gerais
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Featured researches published by Conrado A. B. Galdino.
Revista Brasileira De Biologia | 2001
F. H. Hatano; Davor Vrcibradic; Conrado A. B. Galdino; M. Cunha-Barros; Carlos Frederico Duarte Rocha; M. Van Sluys
We analyzed the thermal ecology and activity patterns of the lizard community from the Restinga of Jurubatiba, Rio de Janeiro, Brazil. The broadest activity was that of Tropidurus torquatus, a sit-and-wait forager, while the active foraging teiid Cnemidophorus littoralis had the shortest activity. The nocturnal gekkonid Hemidactylus mabouia was found active during the day only during early morning and late afternoon, when environmental temperatures are low. Body temperature was highest for Cnemidophorus littoralis and lowest for the two Mabuya species. The patterns found here are discussed and compared to those of congeneric species in other habitats in Brazil.
Journal of Herpetology | 2003
Conrado A. B. Galdino; Vinícius B. Assis; Mara C. Kiefer; Monique Van Sluys
Abstract The reproductive cycle of the tropidurid lizard, Eurolophosaurus nanuzae, was studied at the montane habitat of Serra do Cipó, Minas Gerais State, Brazil, from June 1996 to June 1997. Reproductive activity of E. nanuzae was cyclic, occurring from the middle of the dry season to the end of the wet season. Female reproductive activity was influenced by photoperiod and by long term precipitation and temperature. Males exhibited sperm in their testes throughout the year, and their reproductive activity was not related with any of the climatic factors analyzed. Fat storage varied inversely with reproductive activity and was more accentuated in females. Mean clutch size was 2.06 (±0.36 eggs) and was not related to female body size. The effects of precipitation on the reproductive cycle of E. nanuzae could be related to the microclimatic conditions necessary for embryo development and hatchling survivorship, as well as to the greater food availability for hatchlings during the wet season.
Brazilian Journal of Biology | 2003
M. Cunha-Barros; M. Van Sluys; Davor Vrcibradic; Conrado A. B. Galdino; F. H. Hatano; Carlos Frederico Duarte Rocha
We studied the parasitism by larvae of the chigger mite Eutrombicula alfreddugesi on the lizard community of Restinga de Jurubatiba, Rio de Janeiro State, Southeastern Brazil. We investigated the patterns of infestation (prevalence and intensity) of chigger mites in four sympatric lizards: Tropidurus torquatus, Mabuya agilis, M. macrorhyncha and Cnemidophorus littoralis. All lizards collected were checked for the presence of mites, which were counted under stereomicroscope. We tested the relationship between intensity of infestation and lizard body size for each species using regression analysis. The prevalences and mean intensities (+ one standard deviation) of infestation on each host species were, respectively: 100%; 86.4 + 94.6 in T. torquatus (n = 62); 100%; 20.9 + 9.3 in M. agilis (n = 7); 100%; 11.1 + 13.1 in M. macrorhyncha (n = 12); and 95.2%; 19.1 + 16.8 in C. littoralis (n = 21). Only for C. littoralis did body size significantly affect the intensity of infestation (r = 0.27, p = 0.02). For all lizard species, the body parts where chiggers occurred with the highest intensity were those of skin folds and joint regions.
Journal of Parasitology | 2014
Conrado A. B. Galdino; Robson W. Ávila; Castiele Holanda Bezerra; Daniel Cunha Passos; Gabriela C. Melo; Djan Zanchi-Silva
Abstract: This study reports helminth infection patterns of the lizard Tropidurus hispidus from an area of semiarid caatinga in northeastern Brazil (Ceará state). The lizard population was parasitized by 8 helminth species, and the species composition of the component community resembles that found for other Neotropical lizards. The prevalence of parasites was higher for males compared with females, whereas no relation was found between intensity of infection of 2 parasites (Parapharyngodon alvarengai and Physaloptera lutzi) and the lizards body size. For reproductive females, parasite infection intensity was negatively correlated to reproductive investment.
Journal of Herpetology | 2012
Laura Rodrigues Vieira De Alencar; Conrado A. B. Galdino; Luciana B. Nascimento
Abstract We studied the reproduction, sexual dimorphism, and diet of Oxyrhopus trigeminus from two sites in southeastern Brazil. Oxyrhopus trigeminus from Irapé Power Plant (IPP) contained vitellogenic follicles and eggs in both rainy and dry seasons and clutch size was not correlated with female snout–vent length (SVL). Sexual dimorphism was evident. Females attain larger SVL but males have longer tails. We found three females from Santa Clara Power Plant (SPP) with vitellogenic follicles, all of them collected in the dry season. Mean SVLs of adult females from IPP and SPP were 717.7 mm and 786 mm, respectively. Mean SVL of adult males from IPP was 553.4 mm and the single adult male from SPP was 507 mm. The diet of O. trigeminus from IPP included rodents (46.7%), lizards (33.3%), and birds (20%). The volume of individual prey items was not correlated with snake SVL. The diet of O. trigeminus from SPP included rodents (37.5%), lizards (37.5%), birds (12.5%), and marsupials (12.5%). It seemed that an ontogenetic shift may occur in individuals of this snake species from IPP.
Iheringia Serie Zoologia | 2011
Conrado A. B. Galdino; Monique Van Sluys
We studied life history traits of females of the lizard Eurolophosaurus nanuzae (Rodrigues, 1981), an endemic species of rock outcrop habitats in southeastern Brazil. During October 2002 and 2003 we sampled three populations in sites that encompass the meridional portion of the geographic range of the species. Clutch size varied from one to three eggs, with most females carrying two eggs. Clutch size did not vary among populations, but was correlated to female body size. Only larger females produced clutches of three eggs. Females of the small-sized E. nanuzae produce eggs as large as those of medium-sized tropidurids, thus investing a considerable amount of energy to produce clutches resulting in high values of relative clutch mass.
Acta Ethologica | 2017
Stefânia Ventura; Daniel C. Passos; Leonardo L. Machado; Guydo Horta; Conrado A. B. Galdino
Prey must judge the level of threat related to a given predator attack to employ the most efficient escape strategy at a low cost. In this context, the capacity of prey to correctly assess the threat from predators might optimise their decision on the strategy employed to flee. We examined the escape behaviour of the montane lizard Tropidurus montanus in response to different types of predatory stimuli. Lizards stimulated by a model of a natural predator ran shorter distances straight towards shelter and spent less time in flight. On the other hand, when exposed to a model of a nonnatural predator, T. montanus performed longer flights in distance and time, running across open and exposed substrates in the view of predators. These results showed that the lizard T. montanus made different escape decisions according to the type of predatory stimulus.
Journal of Helminthology | 2016
Castiele Holanda Bezerra; R.W. Ávila; Daniel Cunha Passos; Djan Zanchi-Silva; Conrado A. B. Galdino
Parasites represent a great, unknown component of animal biodiversity. Recent efforts have begun to uncover patterns of infection by helminth parasites in several Neotropical lizards. The present study reports, for the first time, levels of helminth infection in a population of the flat lizard Tropidurus semitaeniatus. One hundred and thirty-nine lizards were examined and evidence of five intestinal helminth species was found, comprising four species of nematodes, one species of cestode and an unidentified encysted larval nematode. The most frequently occurring species was the intestinal nematode Parapharyngodon alvarengai, which did not exhibit differences in prevalence and intensity of infection relative to host sex or age/body size. Furthermore, helminth species richness was not related to host body size.
Anais Da Academia Brasileira De Ciencias | 2014
Djan Zanchi-Silva; Diva Maria Borges-Nojosa; Conrado A. B. Galdino
The reproductive ecology of Ameivula ocellifera was studied from September 2009 to August 2010 in a coastal area of the state of Ceará, Brazil. Females reproduced continuously throughout the year, with a peak at the end of the rainy season. Even though there was a predominance of pre-reproductive individuals in the sample, gonadal activity of males peaked synchronously to female reproduction. Mean clutch size was 1.98 ± 0.56 and positively associated with female body size, while mean egg volume was 510.54 ± 84.29 mm3 and unrelated to female body size. We did not find any association between clutch size and average egg volume.
South American Journal of Herpetology | 2007
Leonardo L. Machado; Conrado A. B. Galdino; Bernadete M. Sousa
Abstract The defensive behavior of the endemic tropidurid lizard Tropidurus montanus was studied from January to March 2004 at the Serra do Cipó, State of Minas Gerais, southeastern Brazil. This lizards relied on crypsis associated with immobility as the primary strategy of defense to avoid predators. When attacked, locomotor escape was the tactic employed by all recorded individuals. We analyzed the effects of sex on the maximum flight distance and the effects of body size and social context on maximum flight distance and time of flight for males. Males and females did not differ in maximum flight distance. Males with or without a nearby neighbor did not differ in maximum flight distance, but males close to neighbors increased time spent in flight. We found no effect of male body size on maximum flight distance or on the duration of flight. During capture, lizards exhibited threat display, bite, tail waving, tail breakage, thanatosis, forced freeing, body inflation, and cloacal discharge.