CECAV
URI permanente desta comunidadehttps://bdc.icmbio.gov.br/handle/cecav/1
Centro Nacional de Pesquisa e Conservação de Cavernas
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6 resultados
Resultados da Pesquisa
Item Low-Cost 3D Reconstruction of Caves(2023) Teixeira, Joao Marcelo; Pimentel, Narjara; Barbier, Eder; Bernard, Enrico; Teichrieb, Veronica; Chaves, GimenaCaves are spatially complex environments, frequently formed by different shapes and structures. Capturing cave’s spatial complexity is often necessary for different purposes – from geological to biological aspects – but difficult due to the challenging logistics, frequent absence of light, and because the necessary equipment is prohibitively expensive. Efficient and low-cost mapping systems could produce direct and indirect benefits for cave users and policy-makers, enabling from non-invasive research of fragile structures (like speleothems) to new forms of interactive experiences in tourism, for example. Here we present a low-cost solution that combines hardware and software to allow capturing cave spatial information through RGB-D sensors and the later interpretation of the processed data. Our solution allows the navigation in a 3D reconstructed cave, and may be used to estimate volume and area information, frequently necessary for conservation or environmental licensing. We validated the proposed solution by partially reconstructing one cave in Northeastern Brazil. Although some challenges have to be overcome, our approach showed that it was possible to retrieve relevant information despite using low-cost RGB-D sensors.Item Predation of a mustached bat, Pteronotus sp. (Mormoopidae), by an Amazon tree boa, Corallus hortulanus (Boidae), in the Brazilian Amazon(2023) Barbier, Eder; Pimentel, Narjara Tércia; Bernard, EnricoSeveral bat species use caves as roosts and some of these caves can harbor high concentrations of individuals. Such caves may represent opportunities for certain predators, benefiting from the concentration of potential prey. Here, we report the predation of a Pteronotus bat by a Corallus hortulanus in the Brazilian Amazon. On three occasions over a year, individuals of C. hortulanus were observed around a cave that harbors populations containing tens of thousands of bats. On one occasion, an individual of this snake species was observed preying on a Pteronotus sp. as it left the cave. Our record extends the known diet for C. hortulanus, documenting the predation of a mormoopid bat by this snake species for the first time. This record reinforces the need for longitudinal studies at sites with exceptional bat populations to gain a deeper understanding of the ecological predator-prey relationships involving this diverse group of mammals.Item Ticket to ride: fungi from bat ectoparasites in a tropical cave and the description of two new species(2022-12-01) Carvalho, João Lucas Vitório; Lima, Joenny ; Barbier, Eder; Bernard, Enrico; Bezerra, Jadson Diogo Pereira ; Souza-Motta, CristinaBat flies are obligate ectoparasitic dipterans that are highly specialised to bats and have apomorphic characteristics, such as absent or reduced wings, and specialised legs and claws, which contribute to their survival. They are often associated with fungi and harbour a fungal diversity that is still poorly understood. Fungi were found in association with the bat flies in a cave of the Caatinga dry forest in Brazil. In total, 43% of the captured bat flies were associated with fungi. Seventy-six flies were collected. DNA sequence analyses of 39 isolates showed that the isolates belonged to 13 species within nine genera, with 38 isolates belonging to Ascomycota and one isolate to Basidiomycota, and Aspergillus was the most frequently isolated genus. Most of the genera found have also been isolated from bat bodies and other substrates/hosts in caves in different regions of the world. Based on morphological and multi-locus phylogenetic analyses, two new species of Ascomycota were described: Allophoma brasiliensis sp. nov. and Pyrenochaetopsis cecavii sp. nov.Item Life post-death: Colonization of a bat carcass by Microcerella halli (Engel, 1931) (Diptera: Sarcophagidae) in a Neotropical cave(2022-11-01) Vasconcelos, Simão Dias; Barbier, Eder; Barbosa, Taciano MouraCaves are habitats characterized by low light or total darkness, whose fauna is largely composed of animals that adapt to dark environments, such as bats and many arthropods. Here, we present the first record of bat carcass colonization by Diptera larvae in a cave in the Neotropics. Twenty-one adult specimens of Microcerella halli (Sarcophagidae), seven males and 14 females, emerged from larvae collected in a carcass of Pteronotus gymnonotus (Mormoopidae) found in a twilight zone, about 15m from the cave entrance. The mean time between carcass collection and adult emergence was 17.99±0.44 days. As colonization by M.halli only occurs after death, we estimated the mean duration of the pupal stage – by recording daily pupation and emergence data – and attempted a preliminary estimate of the post-mortem interval, which indicated that larviposition occurred at least 24h before carcass collection. Furthermore, we discussed the fact that M.halli females can find and colonize carcasses in low light environments, reinforcing the forensic potential of the species.Item Two new cave-dwelling pseudoscorpion species (Arachnida: Pseudoscorpiones) from Northeastern Brazil(2023-05-22) Bedoya-Roqueme, Edwin ; Tizo-Pedroso, Everton ; Barbier, Eder ; Lira, André Felipe de AraújoIn a study of pseudoscorpions in caves from the northeastern Brazil, eight species of Pseudoscorpiones were identified. The known distribution of the species Pseudochthonius biseriatus Mahnert, 2001, Cryptoditha aff. elegans, Parachernes (P.) nitidimanus (Ellingsen, 1905), Petterchernes brasiliensis Heurtault, 1986, Ceriochernes foliaceosetosus Beier, 1974, and Progarypus setifer Mahnert, 2001 is extended to include the State of Pernambuco. Additionally, Geogarypus gollumi sp. nov. (Geogarypidae) and Progarypus smaugi sp. nov. (Hesperolpiidae) are described as new species.Item Streblid flies parasitizing cave bats in Carajás, Amazonia, with a new record for Brazil(2023) Barbier, Eder; Bernard, EnricoStreblid flies (Diptera: Streblidae) are hematophagous and highly specialized parasitic insects, found only on bats (Chiroptera). Caves are important roosts for bats but, despite harboring high bat richness, relatively few studies exist on the ecology and biology of streblid flies in cave environments, especially in Amazonia, the largest domain in northern Brazil, with >140 bat species and thousands of caves. To fill some of the gaps in the geographical distribution and interspecific relationships for streblid flies in the region, we sampled bats in six caves in Carajás National Forest, a protected area in Pará state (Brazil). Thirteen of the 14 streblid species found are new records for Carajás, with three new records for Pará state and two for the northern region of Brazil. Nycterophilia fairchildi was recorded for the first time in Brazil. Most streblids had host-specific behavior, however, N. fairchildi, Trichobius caecus, and T. johnsonae were less host-specific, parasitizing different Pteronotus bat species. The gregarious behavior of Pteronotus species and the spatial distribution of their colonies within the caves may be important factors in the flies’ exchange among congener hosts and deserve special attention in future studies. Furthermore, studies on ecological interaction networks between bats and their ectoparasitic flies in caves will be useful for a broader understanding of how this relationship is structured over time and space, as well as its impact on both bats and flies.