RI INPA :: Início

Coleções

Boletim Info.LBA

Boletim Informativo: Núcleo de Roraima

Livros

Revista Amazoniana

Teses & Dissertações

Submissões Recentes

Dissertação
Efeitos da exposição ao glifosato em concentrações ambientalmente relevantes sobre biomarcadores morfológicos, neurotóxicos e de mutagenicidade em filhotes de tartaruga-da-Amazônia
(Instituto Nacional de Pesquisas da Amazônia - INPA, 2025)
Martins, Victor Hugo Cunha
;
Moreira, Fabíola Xochilt Valdez Domingos
;
Magalhães, Marcela dos Santos
;
Martins Formiga, Kyara
;
Souza, Flávia Kelly Siqueira de
Brazil is one of the countries that uses the most pesticides due to its wide variety of agricultural production. In the state of Amazonas, with the population growth and high demand for food, many of these pesticides were used in the region in order to increase local productivity to supply the trade. One of the most widely used pesticides in the region is glyphosate, a broad-spectrum herbicide used to combat weeds in plantations. The effects of these pesticides often end up affecting non-target species, due to contamination in aquatic environments caused by surface runoff from plantations. In this sense, this study aimed to evaluate the cytotoxic, mutagenic, hepatotoxic, nephrotoxic and biochemical effects that the pesticide glyphosate, in environmentally relevant concentrations of 32 μg/L and 65 μg/L, exerts on hatchlings of the Amazon turtle, Podocnemis expansa. The concentration defined as safe by CONAMA was capable of inducing histopathological damage in the liver tissue of P. expansa, but was not sufficient to cause changes in the frequency of mininuclei, Erythrocytic Nuclear Anomalies (ENAs), kidney histopathology or alter acetylcholinesterase activity. Our results indicate that glyphosate is capable of causing damage to the liver histopathology of Amazon turtle hatchlings at environmentally relevant concentrations.
Dissertação
Partição de recursos em assembleias de primatas neotropicais: uma comparação entre dois tipos vegetacionais da Amazônia
(Instituto Nacional de Pesquisas da Amazônia - INPA, 2011)
Brum, Marlos Daniel Cid
;
Spironello, Wilson Roberto
Species coexistence is determined in part by the ways species partition resources. Sympatric species use different areas of niche space in several different ways. Primate species are thought to coexist primarily due to differences in daily activity patterns, the use of space, vertical stratification, and diet. The existence of many sympatric primate species in Amazonia suggests that the niche they occupy is partitioned in more than one dimension. In order to examine the mechanisms of coexistence among Neotropical primates, we carried out the first-ever comparison of primate community structure between two areas with the same primate species composition but different vegetation types. We found no evidence for partitioning of habitat use, daily activity patterns, or vertical stratification. All species showed similar daily activity patterns. While species in the REBIO Uatumã assemblage showed preferences for certain forest strata, there was significant overlap in the use of intermediate strata, making vertical stratification an inefficient mechanism for niche separation. We did not detect structural differences between habitats, but we did detect differences in the productivity of habitats and vegetation types during the rainy season. Primates were found to prefer more productive habitats, but only during the rainy season. Habitat preferences are thus driven by habitat productivity, and do not contribute to niche differentiation. Our results suggest no partitioning of the principal niche axes of the primate assemblages we studied. Our hypothesis is that differences in diet during the dry season may be the leading mechanism of resource partitioning among these primates, since food availability is not limiting during the rainy season.
Dissertação
Fauna de artrópodes associada a ninhos de aves e mamíferos em uma floresta de terra firme na Amazônia Central, Brasil.
(Instituto Nacional de Pesquisas da Amazônia - INPA, 2001)
Torres, Waldenira Mercedes Pereira
;
Barrett, Toby Vincent
Seventy-one samples of arthropods extracted from 62 birds' nests, six rodents' nests and three unidentifíed nests, in a terra-firme forest north of the River Amazon in the municipal districts of Silves and Itacoatiara, Amazonas State, Brazil, were analyzed. The 21.109 specimens were divided among 14 Orders and 58 identified Families of Hexapoda and five Orders of Arachnida, in addition to occasional specimens of Malacostraca, Diplopoda and Chilopoda. The nest fauna was dominated numerically by mites (82%) which made up 98% of the arachnids. The 84 spiders belonged to 13 Families, mainly of cursorial species, among which Salticidae (38%) were the most frequent. Two species of pseudoscorpions of the Family Withiidae were associated with rodents nests, and seven species of six other Families were found in the nests of passeriform birds. Among the insects and Collembola, the most abundant groups were Hymenoptera, with seven Families, including five subfamilies of Formicidae accounting for 22% of the Hexapoda; Collembola (21%) especially Entomobryidae which were present in nearly ali nests; Psocoptera (20%), mainly nymphs, present in 51 nests and represented by six Families of which Archipsocidae was the most frequentiy found; Blattaria (6%) with six Families; and Thysanoptera (4%) with two Families. Muscidae predominated among the 10 Families of Diptera extracted, due to 41 coprophagous larvae of Philornis aitkeni associated with a fledgling Chelidoptera tenebrosa (Bucconidae) in its underground nest. Among the categories of nests with the most dintinctive faunas, the pendant nests of the crested oropendola Psarocolius decumanus (Icterinae) contained relatively low numbers of individual arthropods considering the weight of the nest, but were associated with seven of the 14 Families of Coleoptera recorded. Schultesia lampyridiformis (Blattaria: Blaberidae) and an undescribed species of Rhopalochernes (Pseudoscorpionida: Chernetidae) were found only in the nests of P.decumanus, the pseudoscorpion having a phoretic association with this cockroach.
Dissertação
Propagação de Piper marginatum Jacq.: qualidade de luz na germinação in vitro de sementes e níveis de iluminação na estaquia
(Instituto Nacional de Pesquisas da Amazônia - INPA, 2017)
Cabral, Lorena de Paula
;
Ferreira, Sidney Alberto do Nascimento
;
Atroch, Eva Maria Alves Cavalcanti
;
Chaves, Francisco Celio Maia
Piper marginatum Jacq. is an Amazonian Piperaceae, popularly known as capeba, malvarisco, pimenta-do-mato, capeba-cheirosa and nhandi. It is used mainly in the region as a remedy against liver diseases, vesicular diseases, muscular spasms, snake and insect bites and for the relief of intestinal gases; in cooking is used to replace the black pepper; and there are scientific reports that leaf extract and essential oil have biological activities such as cercaricida, insecticide, acaricide and fungicide. Its collection is done indiscriminately through the ripening of its vegetative and reproductive parts, which in the long run can exert negative effects on the natural populations. In the literature, there are reports that the propagation of this species has some limitations. In general, seeds have low germination rates, both in the field and in vitro, and low rooting rates in vegetative propagation, via cuttings. Therefore, this work aimed to investigate more efficient methods of reproduction. The influence of the light quality on germination in vitro was evaluated through a DIC experiment, using five light filters: red, far-red, green, blue and transparent and evaluated the germination (%), germination speed index (GSI) and mean germination time (MGT). The germination was not significantly influenced by the light filters, unlike the GSI and MGT that presented the best performances under the red light. In the vegetative propagation, the experiment was installed in DIC, with a factorial scheme of 2 x 3, two types of shading of the mother plant (full sun and shaded to 50%) and three types of cuttings (apical, median and basal). The variables analyzed were: survival (%), rooting (%), number of shoots, number of leaves, length of the highest root, root dry mass and shoot dry mass. The apical cuttings of Piper marginatum presented better performance in the propagation by cutting, followed by the basal and, finally, medium, which, in general, are independent of the shading of the matrix plant.
Cézar, Kelve Franklimara Sousa