Estudo comparativo da taxocenose de anuros de quatro municípios do Lagamar Paulista

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Estrutura da comunidade de anfíbios da região de Bauru, SP

Pós-graduação em Ciências Biológicas (Zoologia) - IBB

Helmintofauna associativa à anfíbios da Ilha Anchieta, litoral norte do estado de São Paulo, Brasil

Pós-graduação em Ciências Biológicas (Zoologia) - IBB

Chromosome Evolution in Dendropsophini (Amphibia, Anura, Hylinae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Levantamento da anurofauna da Escola do Meio Ambiente, Botucatu-SP

O objetivo do presente estudo foi realizar o inventário da anurofauna, assim como investigar a distribuição espacial, temporal e a abundância relativa das espécies localizadas em um mosaico vegetacional na região de Botucatu, SP (22 º55’ 23’’S e 45 º27’ 28’’W). A área estudada situa-se na Escola do Meio Ambiente, possui aproximadamente 12 hectares e uma grande heterogeneidade de habitats. Os dados foram obtidos entre outubro de 2006 a outubro de 2007 e entre setembro de 2009 e setembro de 2010, totalizando 29 dias de campo. Os métodos utilizados foram busca ativa e armadilhas de interceptação e queda. Foram identificadas 26 espécies de anfíbios de cinco famílias: Bufonidae (2 sp), Hylidae (15), Leptodactylidae (6), Leiuperidae (2) e Microhylidae (1), distribuídas em três grandes áreas: área aberta, mata e borda de mata. Os ambientes de área aberta foram utilizados pela maioria dos anfíbios (n=21), enquanto a borda de mata apresentou a menor riqueza (n=5). Treze espécies foram observadas na mata. As espécies Physalaemus cuvieri, e Leptodacylus furnarius foram as mais generalistas, sendo encontradas em seis e cinco dos sete ambientes estudados, respectivamente. Entre as espécies estudadas, Leptodactylus bokermanni, foi a única registrada em apenas um dos ambientes (borda da mata). As espécies mais abundantes na comunidade foram Dendropsophus nanus representando 13%, seguida de Dendropsophus sanborni e Scinax fuscomarginatus ambas com 12 % dos indivíduos. As menos abundantes foram: Rhinella icterica, Leptodactylus mystacinus e Eupemphix nattereri onde cada uma contribuiu com 0,2% dos indivíduos registrados. A grande maioria das espécies foi registrada no período quente e chuvoso (setembro a março), com exceção da espécie Scinax hiemalis que esteve presente na época fria e seca. Já Hypsiboas ...(Resumo completo, clicar acesso eletrônico abaixo)

Water balance and spatial distribution of an anuran community from Brazil

Terrestrial amphibians may dehydrate when exposed to low humidity, representing an important factor affecting spatial distribution and community composition. In this study we investigated whether rates of dehydration and rehydration are able to explain the spatial distribution of an anuran community in a Restinga environment at the northern coast of the State of Bahia, Brazil, represented by 11 species distributed in 27 sample units. The environmental data set containing 20 variables was reduced to a few synthetic axes by principal component analysis (PCA). Physiological variables measured were rates of dehydration, rehydration from water, and rehydration from a neutral substrate. Multiple regression analyses were used to test the null hypothesis of no association between the environmental data set (synthetic axes of PCA) and each axis representative of a physiological variable, which was rejected (P < 0.001). Of 15 possible partial regressions only rehydration rate from neutral substrate vs. PC1. and PC2, rehydration rate from water vs. PC1, and dehydration rate vs. PC2 were significant. Our analysis was influenced by a gradient between two different groups of sample units: a beach area with high density of bromeliads and an environment without bodies of water with low density of bromeliads. Species of very specific natural history and morphological characters occur in these environments: Phyllodytes melanomystax and Scinax auratus, species frequently occurring in terrestrial bromeliads, and Ischnocnema paulodutrai, common along the northern coast of Bahia and usually found in forest remnants within environments with low number of bodies of water. In dry environments species with lower rates of dehydration were dominant, whereas species showing greater rates of dehydration were found predominantly in microhabitats with greater moisture or abundance of bodies of water.

Ecologia de comunidades e comportamento reprodutivo de anfíbios anuros em savana amazônica

The Amazon savannas occur as isolated patches throughout extensive areas of forest in the states of Amapá, Amazonas, Pará, and Roraima. There is a considerable variation in the composition of anuran assemblages in the localities and phytophysiognomies of Amazon savannas and given the absence of studies on reproductive behavior, a systematic and geographically wide sampling has been carried out in the Amapá savanna, located in the Eastern Amazon. The study was conducted in a savanna area in the state of Amapá to examine the composition, ecology, and reproductive behavior of anuran amphibians. We carried out 24 field trips in each phytophysiognomy (gramineous-woody savana, gramineous-herbaceous-woody savana, park savana, and arboreal savanna); for analysis of reproductive behavior observations were made during the period January to December 2013, lasting four consecutive days. Samples were collected by active and acoustic search along 20 plots of 100x50 meters. Twenty-one anuran species were recorded, of which four are new records for the state of Amapá: Dendropsophus walfordi, Scinax fuscomarginatus, Pseudopaludicola boliviana e Elachistocleis helianneae. The KruskalWallis ANOVA revealed significant differences between richness and species diversity in the phytophysiognomies (p < 0.05). The Bray-Curtis similarity coefficient divided the phytophysiognomies into three groups: arboreal savana, gramineous-woody savanna and gramineous-herbaceous-woody savanna, and park savanna. According to the non-metric multidimensional scaling, the structure of the anuran community resulted in a separation into three phytophysiognomies, with significant differences in the structure of communities (ANOSIM, R = 0.823; p < 0.001). In the study of community ecology, the results obtained for spatial, temporal, and trophic niche breadth suggest that the assemblage of anurans of the Amapá savanna is not composed of predominantly generalist species. Also, the presence of other specialist anurans may explain the processes of speciation associated with the isolation of habitats, resulting in heterogeneity and spatial discontinuity in the phytophysiognomies with open formations. The null model analysis revealed that the community is structured based on temporal and trophic niche, indicating a significant influence of contemporary ecological factors on the assemblage. The absence of structure based on spatial niche might be explained by the spatial segregation in the distribution and occupation of anurans in the different phytophysiognomies of the Amapá savanna. Regarding the reproductive behavior of anurans, 11 species were classified as having a long breeding season, intrinsically associated with the rainy season and the reproductive mode of most species that lay egg clutches in lentic water bodies. Six reproductive modes were recorded and parental care was observed in Leptodactylus macrosternum and L. podicipinus, whose reproductive mode is characterized by foam nests. Regarding behavioral reproductive strategies, calling males were observed in all species of anurans, satellite males were recorded only for D. walfordi, Hypsiboas multifasciatus, S. nebulosus and S. fuscomarginatus; active search for females was observed for Phyllomedusa hypochondrialis and L. fuscus, and male displacement was recorded only for Rhinella major and R. margaritifera. Of the reproductive behaviors observed, throat and vocal sac display is associated with courtship and territorial behavior exhibited by males. In addition to courtship behavior, visual signals associated with courtship strategies were recorded for the anurans of the Amapá savanna.