![]() ![]() It has an arboreal habit, often found in the understory of forests and only occasionally on the ground with an insectivorous–omnivorous feeding habit ( 2– 4). The marsupial Marmosa constantiae Thomas, 1904 has a geographic distribution restricted to the central region of South America, occurring in the regions of Bolivia, Argentina, Paraguay, and west-central Brazil ( 1). This study describes the parasite species fifth of marsupials in the Neotropical region. Additionally, male species possess three ventral precloacal fans, and in female species, the cuticular processes are divided into 41 pairs of comb-like and 24 pairs of spine-like processes the vulva opens approximately in pair 41. The new species is characterized by the presence of 23 small denticles and by the presence of 38–40 and 65 pairs of the cuticular processes in male and female species, respectively. ![]() The genus Pterygodermatites has 21 species described in mammals worldwide, and to date, only two species have been described for marsupials in Brazil. is described based on specimens recovered from the intestine of the white-bellied woolly mice opossum, Marmosa constantiae, trapped in the municipality of Sinop, Mato Grosso state, Brazil. 4Instituto de Biociências, Universidade Federal Do Mato Grosso, Cuiabá, BrazilĪ new species of nematode, Pterygodermatites ( Paucipectines) sinopiensis n.3Laboratório de Parasitologia Veterinária e Doenças Parasitárias, Faculdade de MedicinaVeterinária, Universidade Federal de Mato Grosso, Cuiabá, Brazil.2Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil.1Programa de Pós-graduação em Biologia Parasitária, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil.As unusually high ratio of shrub leaf litter to tree leaf litter in the 10 to 20 m area reflects the displacement of canopy species by successional shrubs.Beatriz Elise de Andrade-Silva 1,2 *, Natália Alves Costa 1,2, Richard de Campos Pacheco 3, Rogério Vieira Rossi 4 and Arnaldo Junior Maldonado 2 ![]() Even that area, however, is still less than half preirradiation levels with respect to seedling densities. In this regard, only the aspen area has shown any signs of recovering, having experienced an influx of red maple seedlings in 1978. In all three areas competition from successional ground vegetation has continued to delay re-establishment of tree seedlings under the opened canopy at 10 m. To date, redevelopment of forest vegetation at up to 20 m from the radiation source has been slowed significantly by the vigorous colonization of heliophytes. Succession in the radiation areas is presently under study. ![]() Estimates of leaf area index and leaf litter production, by species, have also been obtained. Information available includes population densities by size class, importance values, and diversity values. Belt transects concentric to the radiation source ( 137Cs) are being used to measure compositional changes in the ecotone from aspen to maple-birch forest types. Relatively distinct ecotones constitute a spatially significant portion of many second-growth forest ecosystems. The primary objectives of this study are to determine the effects of ionizing radiation on the tree species composition of the ecotone between two forest types in northern Wisconsin and to compare the postirradiation recovery of the tree flora in the ecotone with that in the bordering forest types. ![]()
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