Navegando por Assunto "Mico argentatus"

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Ecologia de dois grupos de sagüis-brancos, mico argentatus (Linnaeus 1771) em um fragmento florestal natural, Santarém-Pará
(Universidade Federal do Pará, 2006) CORRÊA, Honorly Kátia Mestre; FERRARI, Stephen Francis; http://lattes.cnpq.br/3447608036151352
This monograph presents the results of a long-term study of the behaviour and ecology of two free-ranging groups of Mico argentatus in a natural fragment of forest isolated within a matrix of savanna vegetation in the region of Alter do Chão, in central Amazonia. The groups, denominated Cm1 and Cm2, were habituated and then monitored during 12 months in 2000 and four months in 2001 (Cm1), and seven and three months, respectively, in the two years (Cm2). Analyses of temporal variation were based on three distinct seasons (early wet, late wet, and dry seasons) of 2000, and the longitudinal comparison of July and September in 2000 and 2001. Relationships between ecological variables (abundance of principal resources: fruit and insects) and the ecological and behavioural characteristics of the group were evaluated. The two groups presented distinct composition and sizes, varying from 4-8 and 8-11 members in Cm1 and Cm2, respectively. Quantitative data were collected using scan sampling, with a scan of one minute duration conducted at five-minute intervals throughout the daily activity period of the group. The results show that both groups dedicate more than half their time to foraging and feeding. Diet was composed of fruit, nectar, gum, and animal prey (invertebrates – primarily orthopterans, formicids, and coleopterans – as well as lizards and amphibians). In 2000, groups Cm1 and Cm2 occupied home ranges of 11.5 ha and 14.6 ha, respectively. The seasonal analysis showed a similarity between groups in the systematic allocation of increasing time to foraging and feeding as non-gum resources became scarcer. In addition to a 30% decline in precipitation between years, the longitudinal analysis revealed considerable changes in the composition and spatial distribution of the study groups. These changes appear to have had the main influence on behaviour patterns, resulting in contrasting trends in the two groups. Overall, despite important similarities, the marked differences in many aspects of the ecology of two groups occupying the same fragment constituted one of the principal results of the study, in addition to the considerably variation among seasons and between years. The behavioural strategies records in the study appear to reflect not only the typical variability and flexibility of the callitrichids, but also the ecological conditions imposed by the fluctuations in the availability of resources within a fragment of reduced size.