Papers by Samuel Campos Gomides
en/abstract?inventory+bn00512032012 Abstract: The Atlantic Forest of the state of Minas Gerais, a... more en/abstract?inventory+bn00512032012 Abstract: The Atlantic Forest of the state of Minas Gerais, as well as the remnants of this domain in the rest of Brazil, suffers a marked reduction in size and anthropogenic alteration. This habitat degradation is directly reflected in the decrease of species richness within these natural environments. In this sense, the inventory of extant species is necessary to understand the species composition of regions under threat. Despite the great richness of existing reptile species in Minas Gerais, the level of knowledge about the fauna in this state is considered unsatisfactory and very fragmented. The aim of this study was to record the composition of the reptile fauna of the municipality of Juiz de Fora through the revision of specimens housed at the Herpetological Collection of the Federal University of Juiz de Fora (CHUFJF-Reptiles) and published papers. Better documentation of the reptilian
Por representar um importante remanescente de Mata Atlântica na Zona da Mata mineira, a Serra do ... more Por representar um importante remanescente de Mata Atlântica na Zona da Mata mineira, a Serra do Relogio e considerada de alta importância biologica para conservacao da herpetofauna de Minas Gerais. Portanto, o presente estudo visa apresentar a primeira lista de especies de anfibios e repteis da area estudada, e ampliar o conhecimento sobre a herpetofauna de Minas Gerais, contribuindo para o planejamento e o desenvolvimento futuro de projetos de conservacao da biodiversidade do Estado. As especies foram registradas atraves de busca ativa e tambem atraves de dados secundarios obtidos na area. A lista inclui 17 especies de anfibios de oito familias e 16 especies de repteis de dez familias. Entre essas especies, destaca-se a presenca de algumas que sao tipicamente de areas florestais bem preservadas, como o cagado Hydromedusa maximiliani que e considerado ameacado de extincao e Physalaemus feioi que e uma especie recem-descrita pela ciencia. Estes fatos indicam que a area possui potenc...
Animals partition environmental resources along three basic dimensions: temporal, spatial, and tr... more Animals partition environmental resources along three basic dimensions: temporal, spatial, and trophic. Therefore, species differ in their amount of time and/or period of activity, the places in which they explore preferential microhabitats, and the type of prey they eat. These differences in resource use commonly separate niches, reduce competition, and allow the coexistence of a variety of species. We evaluated the diet of a population of Enyalius bilineatus (Dumeril & Bibron, 1837) in the Cerrado biome of Brazil. We also tested the hypotheses of the existence of (1) variation in diet between males and females and (2) a relationship between prey and predator size. We captured lizards in pitfall traps and dissected them to assess the abundance, frequency and volume of prey items. The diet of males and females were similar with respect to abundance, frequency and volume of prey. Abundance, frequency, and volume of prey items were not related to morphological traits of females, altho...
Onychophora constitui um grupo raro de invertebrados terrestres, reunindo 197 especies descritas,... more Onychophora constitui um grupo raro de invertebrados terrestres, reunindo 197 especies descritas, de distribuicao bastante irregular ao redor do mundo. Em 2008 foi coletado casualmente um exemplar de onicoforo na mata do Parque Municipal da Lajinha, no municipio de Juiz de Fora, Minas Gerais, Brasil, que esta localizado a sudoeste da regiao central da cidade, com um fragmento florestal secundario, remanescente da Mata Atlântica. O exemplar foi identificado como pertencente ao genero Macroperipatus Clark, 1913 (Peripatidae). O registro dessa nova ocorrencia no estado de Minas Gerais amplia a area de distribuicao do grupo.
A maior parte dos remanescentes florestais, na regiao sudeste do Brasil, se encontra em forma de ... more A maior parte dos remanescentes florestais, na regiao sudeste do Brasil, se encontra em forma de fragmentos florestais, e por isso o interesse da comunidade cientifica em estuda-los e analisar as consequencias sobre a biodiversidade. Pretendeu-se, portanto, avaliar a diversidade da herpetofauna em fragmentos urbanos de Mata Atlântica em Juiz de Fora, no sudeste do Brasil e avaliar se certas caracteristicas do ambiente podem influenciar estas diversidades. A amostragem de repteis em campo ocorreu entre setembro de 2008 e abril de 2009 por procura ativa limitada por tempo, e coletas atraves de armadilhas de queda com cerca direcionadora e armadilhas de funil. A area com maior riqueza de especies foi a Fazenda Floresta, seguida pela ReBio Poco D’Anta, e em seguida o PM da Lajinha e a ReBio Santa Cândida. A equitabilidade da Fazenda Floresta foi superior a das demais areas. A diversidade variou significativamente para quase todas as areas, com excecao entre o PM da Lajinha e a ReBio San...
Hydromedusa maximiliani is endemic to mountainous regions, with distribution in the Atlantic Fore... more Hydromedusa maximiliani is endemic to mountainous regions, with distribution in the Atlantic Forest region along mountain ranges in Southeastern and part of northeastern Brazil. This work aimed at studying the feeding habits of a H. maximiliani population from Minas Gerais state, Southeastern Brazil. Specimens were captured, marked, measured and submitted to stomach washing. Pitfall traps were used to capture prey in terrestrial environments, and nets were used to collect macroinvertebrates in the aquatic environmental. We captured and recaptured a total of 33 individuals. From 16 samples of stomach content, we recorded aquatic insect larvae, crabs, and terrestrial invertebrates. In total, 16 categories of prey items were identified. These belonged to 16 orders and 70 families of Insecta, 3 families of Diplopoda, 2 families of Crustacea, and 13 families of Arachnida. Lepidoptera, Baetidae and Diplopoda reached maximum electivity. The most representative group in the diet was Insecta...
Anais do(a) Anais do III Encontro Regional Sobre Biodiversidade e Biologia de Organismos Neotropicais, 2017
Agradeço primeiramente a Deus por sempre guiar meus caminhos. Aos meus pais, Miriam e João, agrad... more Agradeço primeiramente a Deus por sempre guiar meus caminhos. Aos meus pais, Miriam e João, agradeço por todo amor, dedicação e por todas as vezes que mesmo sem compreender sobre o tema do trabalho, tentaram me auxiliar de alguma forma. Aos meus familiares e amigos, obrigada por todo, amor, compreensão, por todos os momentos de alegria e imenso companheirismo. Ao meu orientador, Prof. Dr. Luiz Ricardo Goulart Filho, obrigada pela oportunidade concedida e pelo aprendizado proporcionado. A minha co-orientadora, Dra. Natássia Caroline Resende Corrêa, agradeço por todo carinho, paciência, convívio, por toda ajuda com os experimentos e por todos os conhecimentos compartilhados. Ao Laboratório de Nanobiotecnologia e toda sua equipe, obrigada por terem me acolhido e possibilitado a realização deste trabalho. A fim de investigar a associação de células com um scaffold de colágeno produzido por nosso grupo, ensaios de viabilidade foram realizados para avaliar o potencial citotóxico desse scaffold sobre células A549. Além disso, avaliou-se a morfologia dessas células em contato com o mesmo. Para atingir tal objetivo foi realizado o ensaio de viabilidade Alamar Blue e a análise morfológica foi realizada por meio de análise de micrografias. Nossos resultados mostraram que o scaffold não teve influência significativa sobre a viabilidade das células A549 com 24 e 72 horas de contato, e causou uma moderada diminuição de viabilidade com 48 horas de contato, quando comparado com seus controles. Alterações morfológicas relevantes foram observadas ao se comparar células cultivadas em monocamada e células cultivadas sobre o scaffold. Nossos resultados mostram que o scaffold de colágeno avaliado nesse estudo é biocompatível com células da linhagem A549 e que as alterações morfológicas observadas são condizentes com outros resultados da literatura.
Journal of Herpetology, 2018
BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.
The Bryologist, 2012
The gymnophthalmid genus Anotosaura currently comprises two named species: Anotosaura collaris Am... more The gymnophthalmid genus Anotosaura currently comprises two named species: Anotosaura collaris Amaral, 1933 and Anotosaura vanzolinia Dixon, 1974. Anotosaura vanzolinia (Figure 1) was described as A. collaris vanzolinia by Dixon (1974) based on specimens from the municipality of Agrestina, in the Agreste region of the state of Pernambuco, Brazil. Two years later, Vanzolini (1976a) elevated A. c. vanzolinia to specific rank. It is an insectivorous species that feeds mainly on ants and termites, as well as other arthropods of the edaphic microfauna (Oliveira and Pessanha, 2013). It has a cryptic and semifossorial habit, and it inhabits microhabitats with warmer temperatures, abundant leaf litter, and no incidence of direct sunlight (Delfim and Freire, 2007; Freire et al., 2009). The species has a disjunct and relictual distribution within the Caatinga Domain, where it is found only in mesic areas (Rodrigues, 1986, 2003). The geographical distribution of the species has been based on 12 different locations reported in the literature for the states of Bahia,
Conservation Biology, 2021
The reintroduction of a species that is extinct in the wild demands caution because reintroductio... more The reintroduction of a species that is extinct in the wild demands caution because reintroduction locations may be associated with threats, such as hunting, poor-quality habitat, and climate change. This is the case for Cyanopsitta spixii (Spix's Macaw), which has been extinct in the wild since 2000. The few living individuals were created in captivity and will be used in a reintroduction project within the species' original distribution area, the Caatinga domain (Brazil). Because the occurrence records for this bird are old and inaccurate, we investigated the current and future environmental suitability of the 14 plant species used by C. spixii as resource. These plants are key elements for the long-term reestablishment of the species in the wild, so the use of models helps in the assessment of the effects of climate change on the availability of these resources for the species and informs selection of the best places for reintroduction. We based our models of environmental suitability on 19 bioclimatic variables and nine physical soil and topography variables. Climate projections were created for the present and for the year 2070 with an optimistic (SSP2-4.5) and a pessimistic (SSP5-8.5) climate scenario. Both future climate scenarios lead to a reduction in area of environmental suitability that overlapped for all the plant species: 33% reduction for SSP2-4.5 and 63% reduction for SSP5-8.5. If our projections materialize, climate change could thus affect the distribution of key resources, and the maintenance of C. spixii would depend on restoration of degraded areas, especially riparian forests, and the preservation of already existing natural areas. The Caatinga domain is very threatened by habitat loss and, for the success of this reintroduction project, the parties involved must act to protect the species and the resources it uses.
Revista Neurociências
This study aimed to evaluate the effect of the number of animals per cage behaviour of anxiety in... more This study aimed to evaluate the effect of the number of animals per cage behaviour of anxiety in mice exposed to elevated plus-maze. Thirty Swiss mice were divided into 2 groups: group 1 (G1) and group 2 (G2) with 10 and 20 animals respectively in each cage. Upon reaching 90 days of age, each animal was submitted to the elevated plus-maze, only once in the period of 5 minutes. The parameters evaluated in both groups were: percentage of the number of entries in open arm (% nBA) and percentage of time spent in open arms (% tBA). The statistical analyis did not yield significant difference between the two groups in regarding %nBA (p = 0.87) nor with respect to tBA% (p = 0.98). Our work concluded that the maintenance of 10 or 20 mice per cage did not cause any significant alteration in the anxiety levels of the animals, thus it suggests being indifferent to maintain 10 or 20 mice per cage.
Phyllomedusa: Journal of Herpetology, 2015
Genetic diversity and structure of two species of Enyalius (Squamata: Leiosauridae) from neotropi... more Genetic diversity and structure of two species of Enyalius (Squamata: Leiosauridae) from neotropical biodiversity hotspots. Enyalius, a lizard genus endemic to South America, is mostly distributed in the remains of the Atlantic Forest and in the Cerrado. The genus has been the topic of a few studies but none has quantified the genetic diversity and structure within and among populations of Enyalius. The genetic diversity and structure of populations of E. bilineatus (N = 20) and E. perditus (N = 28) are examined using a 234-bp fragment of the cytochrome b gene and compared with the sequences reported in other published data. Nineteen distinct haplotypes (eleven for E. perditus and eight for E. bilineatus) were found, eight of which were recorded for the first time. The haplotype diversities are highly similar for both species (0.684 for E. perditus and 0.647 for E. bilineatus). The genetic distance between the two species is 20.3% and the distance within species is 2.0% and 5.6% for...
Phyllomedusa: Journal of Herpetology, 2015
Genetic diversity and structure of two species of Enyalius (Squamata: Leiosauridae) from neotropi... more Genetic diversity and structure of two species of Enyalius (Squamata: Leiosauridae) from neotropical biodiversity hotspots. Enyalius, a lizard genus endemic to South America, is mostly distributed in the remains of the Atlantic Forest and in the Cerrado. The genus has been the topic of a few studies but none has quantified the genetic diversity and structure within and among populations of Enyalius. The genetic diversity and structure of populations of E. bilineatus (N = 20) and E. perditus (N = 28) are examined using a 234-bp fragment of the cytochrome b gene and compared with the sequences reported in other published data. Nineteen distinct haplotypes (eleven for E. perditus and eight for E. bilineatus) were found, eight of which were recorded for the first time. The haplotype diversities are highly similar for both species (0.684 for E. perditus and 0.647 for E. bilineatus). The genetic distance between the two species is 20.3% and the distance within species is 2.0% and 5.6% for...
Phyllomedusa: Journal of Herpetology, 2015
Genetic diversity and structure of two species of Enyalius (Squamata: Leiosauridae) from neotropi... more Genetic diversity and structure of two species of Enyalius (Squamata: Leiosauridae) from neotropical biodiversity hotspots. Enyalius, a lizard genus endemic to South America, is mostly distributed in the remains of the Atlantic Forest and in the Cerrado. The genus has been the topic of a few studies but none has quantified the genetic diversity and structure within and among populations of Enyalius. The genetic diversity and structure of populations of E. bilineatus (N = 20) and E. perditus (N = 28) are examined using a 234-bp fragment of the cytochrome b gene and compared with the sequences reported in other published data. Nineteen distinct haplotypes (eleven for E. perditus and eight for E. bilineatus) were found, eight of which were recorded for the first time. The haplotype diversities are highly similar for both species (0.684 for E. perditus and 0.647 for E. bilineatus). The genetic distance between the two species is 20.3% and the distance within species is 2.0% and 5.6% for...
Journal of Helminthology, 2013
The aim of the present study was to investigate the relationship between nematode infection and t... more The aim of the present study was to investigate the relationship between nematode infection and the ontogeny and diet of the lizard Tropidurus torquatus from a rocky outcrop in the state of Minas Gerais, south-eastern Brazil. Eighty-nine of 110 lizards examined (81.9%) harboured nematodes. Two nematode species were identified, namely, Physaloptera lutzi in the stomach and Parapharyngodon bainae in the intestine, with prevalence values of 67.3 and 60.0%, respectively. The lizard diet was composed mainly of ants, other hymenopterans, beetles and flowers of the species Centrosema coriaceum (Fabaceae). Host body size was positively correlated with nematode abundance, with adults more heavily parasitized than juveniles. The consumption of C. coriaceum had a negative effect on the abundance of both nematode species, suggesting that this plant may possess anthelmintic properties. The probability of a higher worm burden in adult hosts is likely linked with a longer exposure time to infective stages. Beetles, ants and hymenopterans appear to be the main intermediate hosts for P. lutzi. In general, ontogeny and diet composition determine the structure of the helminth community in this species of lizard. penetrating the skin . Thus, the structure of helminth communities may be influenced by both the ecosystem and attributes of the host, such as diet, foraging strategy, behaviour, immunocompetence, sex, age and body size
Herpetological Conservation and Biology
We studied the body temperature of the Saxicolous Lizard (Tropidurus torquatus) in a rocky outcro... more We studied the body temperature of the Saxicolous Lizard (Tropidurus torquatus) in a rocky outcrop of Minas Gerais State, Brazil. The influence of seasonality and the importance of microhabitat temperatures (substrate and air) for T. torquatus body temperature regulation were investigated. The mean body temperature of active T. torquatus was 31.2 ± 3.1ºC (21.0-37.0ºC) and was subject to seasonal variation probably resulting from the adjustment of lizards to changes in the local thermal environment.
Herpetology Notes
Hydromedusa maximiliani is endemic to mountainous regions, with distribution in the Atlantic Fore... more Hydromedusa maximiliani is endemic to mountainous regions, with distribution in the Atlantic Forest region along mountain ranges in Southeastern and part of northeastern Brazil. This work aimed at studying the feeding habits of a H. maximiliani population from Minas Gerais state, Southeastern Brazil. Specimens were captured, marked, measured and submitted to stomach washing. Pitfall traps were used to capture prey in terrestrial environments, and nets were used to collect macroinvertebrates in the aquatic environmental. We captured and recaptured a total of 33 individuals. From 16 samples of stomach content, we recorded aquatic insect larvae, crabs, and terrestrial invertebrates. In total, 16 categories of prey items were identified. These belonged to 16 orders and 70 families of Insecta, 3 families of Diplopoda, 2 families of Crustacea, and 13 families of Arachnida. Lepidoptera, Baetidae and Diplopoda reached maximum electivity. The most representative group in the diet was Insecta, especially those with aquatic larval phase. The information obtained in this study about the diet of H. maximiliani indicates this vertebrate as a potential predator for regulating the density of benthic macroinvertebrates, and our data corroborate other studies which also showed the importance of H. maximiliani as a predator essential to aquatic food web dynamics. These data will be useful in future studies dealing with the biomonitoring of H. maximiliani, and contributing to its preservation as well as to the preservation of habitats where this species lives.
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Papers by Samuel Campos Gomides