Consulta: subjectFacets:"Mamirauá"
Registros recuperados: 4
Data/hora: 09/06/2024 02:57:38

Molecular discrimination of pouched four-eyed opossums from the Mamirauá Reserve in the Brazilian Amazon
Provedor de dados: 74
Autores: Nunes,Cláudia; Ayres,Jose Marcio; Sampaio,Iracilda; Schneider,Horacio.
Previous cytochrome B (CytB) mtDNA studies have suggested four species for the opossum genus Philander (four-eyed opossums), three (P. mcilhennyi, P. andersoni and P. opossum) from the Amazon and one (P. frenata) from the Brazilian Atlantic forest. During a faunal survey nine specimens of Philander sp. and four of Didelphis marsupialis were collected in the Mamirauá Sustainable Reserve, Amazonas State, Brazil. Preliminary analyses based on morphology and geographical distributions were not conclusive, suggesting that Philander specimens could belong to either P. andersoni or P. opossum. In order to elucidate the relationship of this taxon to the remaining Amazonian taxa, seven Philander and two Didelphis specimens animals were sequenced for the cytB mtDNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytochrome B; Mamirauá; Molecular phylogeny; MtDNA; Philander; Pouched four-eyed opossum.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200015

A new species of Atractus (Reptilia: Ophidia: Colubridae: Dipsadinae) from the Amazon forest region in Brazil
Provedor de dados: 16
Autores: Hoogmoed, M.S.; Prudente, A.L.C.
Three specimens of Atractus natans were found during fieldwork in the “Reserva Mamirauá”, Amazonas and a fourth one in the “Estação Científica Ferreira Penna”, Floresta de Caxiuanã, Pará, Brazil. The specimens from Mamirauá were all collected in floating logs in várzea forest during the period of flooding. The new species is small (maximum total length 308 mm) with a coniform head, has 17-17-17 smooth dorsals, without apical pits, male lacking pre-anal keels, ventrals 136-162, caudals 19-25, anal undivided. One or two postoculars, loreal 1.6 –2.8 times as long as high, frontal triangular, wider than long. Maxillary teeth 5-6. The hemipenis is bilobed, with bifurcated sulcus spematicus, capitulum with calyces covered by very small spines, body covered by...
Tipo: Article / Letter to the editor
Palavras-chave: Reptilia; Colubridae; Atractus; Spec. nov.; Brazil; Amazonia; Mamirauá; Caxiuanã; Habitat; Várzea; 42.82.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/216162

Population Dynamics Modeling of Arapaima gigas
Provedor de dados: 36
Autores: Coutinho,Eliane dos Santos de Souza; Bevilacqua,Luiz; Queiroz,Helder Lima de.
Pirarucu (Arapaima gigas) has been of the most important natural fishing resources of the Amazon region. Due to its economic importance, and the necessity to preserve the species hand, field research concerning the habits and behavior of the pirarucu has been increasing for the last 20 years. The aim of this paper is to present a mathematical model for the pirarucu population dynamics considering the species peculiarities, particularly the male parental care over the offspring. The solution of the dynamical systems indicates three possible equilibrium points for the population. The first corresponds to extinction; the third corresponds to a stable population close to the environmental carrying capacity. The second corresponds to an unstable equilibrium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pirarucu (Arapaima gigas); Population dynamics; Mamirauá; Mathematical Modeling.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000200012

Bottlenecks in the migration routes of Amazonian manatees and the threat of hydroelectric dams
Provedor de dados: 36
Autores: ARRAUT,Eduardo Moraes; ARRAUT,José Luis; MARMONTEL,Miriam; MANTOVANI,José Eduardo; NOVO,Evlyn Márcia Leão de Moraes.
ABSTRACT In a particular region within western Amazonia, Amazonian manatees (Trichechus inunguis) live in a floodplain environment that becomes inhospitable for them during the annual low-water season. To flee from it, they undergo a dangerous migration to a refuge while water levels are dropping fast. Our aim was to better understand the role of depth variation in this migratory process. We analyzed the sole tracking data on wild manatees (n=10 males), 30 years of Landsat images, a 14-year hydrograph and a 3-D bathymetric model. Migratory routes contained shallower segments, here called 'migratory bottlenecks', which dried out at the end of most lowering-water seasons, blocking the passage to the refuge. Manatees began migrating just in time to traverse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sirenia; Behavioral plasticity; Mamirauá; Amazon development.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000100007