CECAV
URI permanente desta comunidadehttps://bdc.icmbio.gov.br/handle/cecav/1
Centro Nacional de Pesquisa e Conservação de Cavernas
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Item 3D geoelectric modeling to characterize ferruginous caves in Brazil, using numerical and physical simulation(2024-03) Cardoso, Luiz Henrique; Bacellar, Luis de Almeida Prado; Oliveira, Nilciléia Cristina de Magalhães; Maciel, Álvaro SimõesIn Brazil, the discovery of ferruginous pseudokarst caves in laterite profiles on iron mining areas has been significant. As a result, speleological legislation has restricted mining activity to protect caves considered to be most relevant, however, with subjective criteria. This requires the collection of precise data to better guide them. The application of techniques for the identification and characterization of caves is still limited, due to the irregular topography, vegetation and the obstruction of conduits and saloons by material that fell from the ceiling and walls, and it was also mobilized by miners. A relatively cheap and quick alternative to mapping the caves, compared to classical methods such as boreholes, is Electrical Resistivity (ER). Literature data are apparently controversial, as caves filled with air sometimes have high resistivity (tens to hundreds of thousands of ohms. meter), and sometimes low (up to a few thousand ohms. meter). Thus, the objectives were to investigate the electrical resistivity duality that can be observed in these caves, and present a non-invasive cave mapping methodology and a 3D geoelectric model (inverted), to be used as a reference in future field research. To this end, direct and inverse 3D geoelectrical numerical modeling was carried out to predict the electrical resistivity of typical elements in the ferruginous pseudokarst system of the Quadrilátero Ferrífero (QF), southeast region, where hundreds of caves were cataloged. Field surveys, laboratory analysis of collected material and simulations in a reduced physical model validated the predictions. The results showed that moisture around ferruginous caves can attenuate the electrical signal or even mask the high resistivity of conduits and saloons filled with air. Therefore, it was the main factor considered in the geoelectric model.Item A New Attempt to Estimate Underground Soil Leakage through High-Density, Fixed-Point Monitoring in a Typical Karst Rocky Desertification Region(2024-05-01) Dayun Zhu; Qian Yang; Hua Xiao; Yingshan ZhaoUnderstanding soil loss pathways in karst regions is crucial for erosion control. Combining high-density measurements of grid points with runoff plot monitoring, we attempt to use a new indirect method to study the characteristics of soil loss in karst rocky desertification areas of Salaxi Town, Guizhou province. One cycle year monitoring data of 12640 grid points were applied in the soil loss analysis. This study identifies underground leakage as the primary pathway of soil loss, with an mean soil leakage of 21.51 kg in potential areas, accounting for 83.12%, and an average leakage of 22.69 kg in in mild karst rocky desertification areas accounting for 81.48%. Mixed vegetation types (forest, shrub, and grass) were better at preventing surface soil loss but increased underground leakage compared to single vegetation types. The rainy season significantly influences soil erosion, accounting for 67.88% of total loss, with slight variations among different karst rocky desertification grades and vegetation types. Mean underground leakage rates during the rainy and dry seasons are 63.34% and 36.66%, respectively. Although this method still has certain limitations, it plays a positive role in revealing the mechanism of soil erosion processes in karst regions.Item A New Genus of Prodidominae Cave Spider from a Paleoburrow and Ferruginous Caves in Brazil (Araneae: Prodidomidae)(2024-08-05) Cizauskas, Igor; Zampaulo, Robson de A.; Brescovit, Antonio D.A new monotypic genus of Prodidominae, Paleotoca gen. n., is proposed to include one cave species collected in a paleoburrow and ferruginous caves from Quadrilátero Ferrífero, Minas Gerais, Brazil: Paleotoca diminas sp. n. (♂♀). The new genus is closely related to other Neotropical Prodidominae by sharing the classic claw tuft clasper. Paleotoca gen. n. is diagnosed by the absence of a dorsal abdominal scutum, a ventral parallel rows of strong spines on the tibia and metatarsus I–II, a lack of a conductor, a discrete median apophysis on the bulb and a bifid retrolateral tibial apophysis in the male palp, a posterior extension that is beak-shaped, and folds of a copulatory duct ventrally visible in the female epigyne. Like other Prodidominae species from caves, P. diminas sp. n. is a troglobitic spider with morphological characteristics that indicate specialization to live in subterranean environments, including reduction in cuticular pigments, eye loss, heavy spination and trichobothria.Item Abismo "ponta de flecha" um projeto arqueológico, paleontológico e geológico no médio curso do Ribeira de Iguape, SP(Espeleo-Tema, 1984) Lino, Clayton Ferreira; Barreto, Cristiana N Barros; Blasiis, Paulo A. D; Robrahn, Erika M.; Karmann, Ivo; Dias Neto, Coriolano M.Item Abrigo da Metamorfose: impressionantes registros de pinturas rupestres nos Campos Gerais do Paraná, Sul do Brasil(2022) Pontes, Henrique Simão; Massuqueto, Laís Luana; Silva, Alessandro Giulliano Chagas; Oliveira, Karla EduardaEste artigo caracteriza e detalha o Abrigo da Metamorfose, um registro inédito da riqueza arqueológica paranaense. Situado no município de Piraí do Sul, região dos Campos Gerais do Paraná, este sítio arqueológico surpreende não apenas pela quantidade de painéis e pinturas, mas também pelo bom estado de conservação de alguns conjuntos e pela diversidade de representações e estilísticas utilizadas. Todos os painéis com pinturas rupestres foram registrados fotograficamente e produzidos decalques digitais a partir do tratamento das imagens filtradas no programa DStretchcom o uso da técnica de matriz de correlação em programa de edição de imagens em três fases - automática, semiautomática e manual. Os painéis rupestres foram mapeados e geoespacializados por topografia espeleológica com base no método de graduação e convenções espeleométricas da Union Internationale de Spéléologie(UIS). Foram documentados 32 painéis, que somam 887 representações zoomórficas, antropomórficas, geométricas, estruturas construídas, formas enigmáticas e vestígios. Apesar de o local estar razoavelmente conservado, são necessárias ações urgentes para a efetiva proteção deste sítio e evitar a degradação do conteúdo arqueológico por queimadas, circulação livre do gado, recobrimento de vegetação e visitação descontrolada.Item Abrigo diurnos, composição de colônias, dimorfismo sexual e reprodução do morcego hematófago Desmodus rotundus(E.Geoffroy) (Chiroptera, Phyllostomidae) no Estado de São Paulo(Revista Brasileira de Zoologia, 2004-09) Gomes, Murilo Novaes; Uieda, WilsonSão apresentadas informações obtidas de colônias de Desmodus rotundus encontradas em 12 abrigos diurnos no Estado de São Paulo, em 1999 e 2000Item Abundância de Lophostoma SPP. (Chiroptera: Phyllostomidae) em área de cerrado do nordeste Maranhense(Sociedade de Ecologia do Brasil, 2011-09) Nascimento Pereira, A.C; Bastos, V.J.C; Brito, G.A; Castro, M.C; Moraes, L.S; Silva, J.A; Silva, M.A.M; Moraes, J.L.P; Rebêlo, J.M.MRegistro da ocorrência de morcegos do gênero Lophostoma em área de cerrado do Estado do MaranhãoItem Ácaros cavernícolas do Brasil: uma observação preliminar sobre a ocorrência e distribuição das famílias(Mundos Subterráneos, 2009) Bernardi, Leopoldo Ferreira de Oliveira; Zacarias, Maurício Sergio; Silva, Marconi Souza; Ferreira, Rodrigo LopesItem Activity cycle, feeding and reproduction of Molossus ater (Chiroptera: Molossidae) in Brazil(Boletim do Museu Paraense Emílio - Zoologia, 1986) Marques, Suely AparecidaItem Activity Rhythms And Behavioral Characterization Of Two Epigean And One Cavernicolous Harvestmen (Arachnida, Opiliones, Gonyleptidae)(The Journal of Arachnology, 1999) Hoenen, Sonia; Gnaspini, PedroItem Alguns problemas envolvidos na classificação Ecológica dos cavernícolas(Espeleo-Tema, 1986) Trajano, EleonoraItem Alimentação de Tadarida Brasiliensis(Geoffroy, 1824) na região urbana de Porto Alegre, RS, Brasil(Chiroptera, Molossidae(Revista Brasileira de Biologia, 1990-05) Fabián, Marta E.; Hartz, Sandra M.; Arigony, Tânia H. A.Item O ambiente das grutas(1974) Temperini, Maria ThrezaArtigo de informações sobre o conjunto de seres vivos dentro das grutas, e demais informações de vários autores sobre o temaItem Amblypygi, Opiliones, Schizomida, Scorpiones and Chilopoda, Tocantins, Brazil(Check List, 2010) Kury, Adriano B.; Chagas-Jr, Amazonas; Giupponi, Alessandro P.L.; González, Abel PérezItem Amphibious Shelter-Builder Oniscidea Species from the New World with Description of a New Subfamily, a New Genus and a New Species from Brazilian Cave (Isopoda, Synocheta, Styloniscidae)(Plos One, 2015) Souza, Leila A.; Ferreira, Rodrigo Lopes; Senna, André R.Item An Exceptionally High Bat Species Richness in a Cave Conservation Hotspot in Central Brazil(2021-07-09) Barros, Jennifer de Sousa; Bernard, Enrico; Ferreira, Rodrigo LopesCaves are among the most used and important roosts for hundreds of bat species worldwide. However, caves remain some of the least known and most threatened environments globally. Documenting the richness of bat species in caves is important not only to draw attention to the uniqueness and relevance of these roosts, but it also contributes to the identification of priority sites for the conservation of bats and the cave fauna dependent upon them. Here, we assessed and described an exceptionally high bat richness in a group of caves in southeastern Tocantins, central Brazil. Inventories carried out in 19 caves resulted in seven families and 31 bat species, of which three were new regional records. Twelve caves were used by threatened and endangered bat species, eight had high diversity indices, and seven caves had high species richness, including one cave that may hold a world record with 26 bat species found inside. The variation in beta diversity is mainly due to species turnover, which indicates that protecting the largest possible number of caves would be ideal for the most efficient conservation of local bat assemblages. The sampled region stands out for its high potential for the conservation of endangered species, and we strongly recommend the full protection of 15 caves classified as a priority for conservation.Item An exceptionally high bat species richness in a cave conservation hotspot in Central Brazil(2021-06) Ferreira, Rodrigo Lopes; de Sousa Barros, Jennifer; Bernard, EnricoCaves are among the most used and important roosts for hundreds of bat species worldwide. However, caves remain some of the least known and most threatened environments globally. Documenting the richness of bat species in caves is important not only to draw attention to the uniqueness and relevance of these roosts, but it also contributes to the identification of priority sites for the conservation of bats and the cave fauna dependent upon them. Here, we assessed and described an exceptionally high bat richness in a group of caves in southeastern Tocantins, central Brazil. Inventories carried out in 19 caves resulted in seven families and 31 bat species, of which three were new regional records. Twelve caves were used by threatened and endangered bat species, eight had high diversity indices, and seven caves had high species richness, including one cave that may hold a world record with 26 bat species found inside. The variation in beta diversity is mainly due to species turnover, which indicates that protecting the largest possible number of caves would be ideal for the most efficient conservation of local bat assemblages. The sampled region stands out for its high potential for the conservation of endangered species, and we strongly recommend the full protection of 15 caves classified as a priority for conservation.Item An integrated 3D digital model of stratigraphy, petrophysics and karstified fracture network for the Cristal Cave, NE-Brazil(2024-01) Pereira, João Victor F.; Medeiros, Walter E.; Dantas, Renato R.S.; Bezerra, Francisco H.R.; Bruna, Vincenzo La; Xavier Jr., Milton M.; Maia, Rubson P.; Gomes, Daniel D.M.; Silva, Danielle C.C.; Maciel, Ingrid B.Digital Outcrop Models (DOMs) are virtual representations of geological features. Although DOMs are widely used tools in geosciences, their integration with other datasets remains relatively underexplored. We combined a DOM, derived from a photogrammetric survey of a carbonate sequence, with lithostratigraphic, petrophysical (porosity, permeability and uniaxial compressive strength), fracture distribution, and karst dissolution information to compose a single integrated three-dimensional digital model. The study site is one of the entrances of the Cristal Cave (São Francisco Craton, Northeastern Brazil), which has been used as a structural and diagenetic outcrop analog for the Brazilian pre-salt carbonate reservoirs. Data from fracture distributions, measured on the exposed surfaces of the cave, were used to build a Discrete Fracture Network, based on the solution of the stereology inverse problem. Fracture apertures were then modified to generate different scenarios of karstification, thus composing Discrete Fracture and Karst Networks. This integrative approach brought relevant insights into the cave development due to dissolution along fracture clusters. Our methodology offers better geological data handling to build static models to be used in a fluid flow modeling environment, contributing to bridge the gap between geophysics/geology and engineering approaches.Item An update on the distribution of the Brazilian funneleared bat, Natalus macrourus (Gervais, 1856) (Mammalia, Chiroptera), with new records from the Brazilian Northeastern(Check List, 2013) Rocha, Patrício Adriano; Mikalauskas, Jefferson Simanas; Bocchiglieri, Adriana; Feijó, José Anderson; Ferrari, Stephen F.Item Análise comparativa da fauna associada a depósitos de guano de morcegos cavernícolas no Brasil - primeira aproximação(Revista Brasileira de Entomologia, 1989) Gnaspini-Netto, PedroNeste estudo foi observada uma estreita relação entre o tipo de morcego guano e sua fauna associada, especialmente quando se analisam alguns táxons