Dissertações em Zoologia (Mestrado) - PPGZOOL/ICB
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2344
O Mestrado Acadêmico foi criado em 1985 e pertence ao Programa de Pós-Graduação em Zoologia (PPGZOOL) do Instituto de Ciências Biológicas (ICB) foi consolidado como um convênio entre Universidade Federal do Pará (UFPA) e Museu Paraense Emílio Goeldi (MPEG).
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Navegando Dissertações em Zoologia (Mestrado) - PPGZOOL/ICB por Assunto "Alouatta belzebul"
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Item Acesso aberto (Open Access) Comportamento alimentar e dispersão de sementes por guaribas (Alouatta belzebul) na Estação Científica Ferreira Penna (Caxiuanã / Melgaço / Pará)(Universidade Federal do Pará, 1999-04-13) SOUZA, Luciane Lopes de; FERRARI, Stephen Francis; http://lattes.cnpq.br/3447608036151352The behaviour of two free-ranging groups of red-handed howler monkeys (Alouatta belzebul) was monitored at the Ferreira Penna Research Station (Pará) over' a thirteen-month period in 1997/98, in order to record their ecological characteristics, especially their diet and seed dispersal. Quantitative behavioural data were obtained using instantaneous scan sampling. Invariably, the howler monkeys were relatively inactive, dedicating more than half their activity time to resting, and much smaller proportions to locomotion, feeding and social behaviour. Use of the home range was strongly influenced by the distribution of food patches, in particular fruiting trees. The diet was basically folivorous-frugivorous, although fruit was the item consumed most frequently (54.1 % of feeding records for the principal group, denominated "L") in the "winter" months (November-April), whereas leaves were consumed far more frequently (84.5 %, group L) in the "summer" (May-August). Seeds took 22:49±6:12 h, on average, to pass through the digestive tract, and ingested seeds were dispersed a mean distance of 172,0±113,8 m, although this distance was significantly greater in the winter. Germination rates recorded in tests in both field and laboratory were inconclusive on the effects of ingestion on viability. The germination rate of ingested seeds was significantly greater than the control (uningested) in only a few cases, such as that of Ficus guianensis, the principal source of fruit. Even so, ingestion did not have a marked negative effect on viability in any case. Overall, the present study reforces the view of A. belzebul as a typical howler monkey, ecologically, albeit relatively frugivorous, and playing a important role as a seed disperser in the Amazon Forest.Item Acesso aberto (Open Access) Ecologia comportamental de Alouatta belzebul (Linnaeus, 1766) na Amazônia Oriental sob alteração antrópica de hábitat(Universidade Federal do Pará, 2005-03-14) CAMARGO, Carolina Cigerza de; FERRARI, Stephen Francis; http://lattes.cnpq.br/3447608036151352The behavioural ecology of two groups of red-handed howler monkeys (Alouatta belzbul) was monitored ou Gennoplasma island (Tucuruí, in the Brazilian state of Pará), between April and September 2004. The two study groups were of similar size and composition, but inhabited different forest types: native forest (group P) and a plantation of native tree species (group Q). Quantitative behavioural data were collected in three-minute scan samples conducted at ten-minute intervals. "AH events" sampling was used to record rare activities such as social and interspecific interactions. Resting was the predominant activity in both groups (P: 67.3%; Q: 61.9%), followed by feeding (P: 15.7%; Q: 21.4%), and locomotion (P: 15.8%; Q: 15.5%). The proportions of the first two categories were significantly different. The diet of both groups was folivorous-frugivorous, supplemented mainly by flowers. No significant seasonal variation was recorded in the diet of either group. The groups occupied home ranges of similar size (P: 5.25 ha; Q: 5.50 ha), although group P travelled 612 m ou average per day, as against 541 m for group Q. Both groups used preferentially their "original" habitat (group P: native forest; group Q: plantation), and the uppermost forest strata. Interspecific interactions were pacific, and social interactions were rare. The results of the present study present greater similarities with those of A. belzebul studies carried out in fragments of Atlantic Forest than at other Amazonian sites (continuous forest). This suggests that habitat disturbance may be a more important determinant of behaviour patterns than the characteristics of the biome. Overall, the results of the present study conicide with the typical Alouatta patterns of behaviour described in the literature.Item Acesso aberto (Open Access) Efeitos de fragmentação de hábitat sobre a prevalência de parasitoses intestinais em alouatta belzebul (Primates, Platyrrhini) na Amazônia Oriental(Universidade Federal do Pará, 2002-05-17) MARTINS, Simone de Souza; FERRARI, Stephen Francis; http://lattes.cnpq.br/3447608036151352Parasitological studies of natural populations of neotropical primates are relatively rare, and few data were available previously for the red-handed howler monkey, Alouatta belzebul. In the present study, populations of A. belzebul were sampled at five sites in the area of the reservoir of the Tucuruí hydro-electric dam in southeastem Brazilian Amazonia, corresponding to the right bank of the Rio Tocantins. Sites included continuous forest and fragments of habitat on islands varying in area from 180 to 484 hectares. A primary aim of the study was the evaluation of the effects of habitat perturbation on patterns of infestation for endoparasites. Population density was estimated at each site using standard line transect surveys of 100-108 km per site. Fecal samples were collected from six to fourteen groups at each site, with a total of 40- 46 individual samples per site (n = 212). Samples were fixed in MIF (Mercury Chromed, Iodine and Formaldehyde), and observed under a 400x optic microscope. Population density varied between 66,4 and 191,5 individuals per square kilometer. Overall, 76,4% of the samples were positive for at least one species of endoparasite, and a total of thirteen species were identified, including eight species of heiminthes and five protozoans. Individual samples contained as many as five different species of endoparasites. At a given site, the number of species identified varied between seven and twelve, and infection rates between 67,5% and 86%. No systematic pattern of parasite diversity or infection rates was found in relation to variables such as population size or density, or habitat fragmentation. Diversity and infection rates varied as much between the two continuous forest sites as among the forest fragments, and were lowest overall at the site with the lowest population density. The only exception was Trypanoxyuris minutus, a common oxyurid transmitted through direct contact, for which a strong correlation was found between infection rates and population density. Overall, little evidence was found to support the hypothesis that habitat fragmentation has a systematic effect on infestation patterns in A. belzebul, although more detailed studies will be recommend before more definitive conclusions can be drawn.