Artigos Científicos - FCB/CALTA

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/5323

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    Abundância, composição e diversidade de Arctiinae (Lepidoptera, Arctiidae) em um fragmento de floresta na Amazônia Oriental em Altamira, PA, Brasil
    (Instituto Nacional de Pesquisas da Amazônia, 2012-03) TESTON, José Augusto; NOVAES, Jessé Bucioli; ALMEIDA JÚNIOR, José Otávio Barros
    This study evaluated the Arctiinae fauna in a fragment of primary forest in Altamira, Pará, Eastern Amazonia, Brazil. The moths were sampled during two years (from August 2007 to July 2009) with a light trap. The following parameters were measured: richness, abundance, constancy, diversity and evenness indices (Shannon H ‘and E') and Brillouin (H and E), and dominance index of Berger-Parker (BP). The richness estimatives were made by nonparametric procedures, Bootstrap, Chao 1, Chao 2, Jackknife 1, Jackknife2 and Michaelis-Mentem. Four hundred and sixty-six individuals of 78 species of Arctiinae were captured, of which twelve are new records for Pará State. Values of parameters analyzed for the entire period were: H ‘= 3.08, E' = 0.708, H = 2.86, E = 0.705, and Sp = 0.294. Communities of the less rainy months were more diverse. Estimators predicted an increase between 17 to 253 in species richness.
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    Arctiinae (Lepidoptera, Arctiidae) ocorrentes em uma área de pastagem na Amazônia Oriental em Altamira, Pará, Brasil
    (Instituto Nacional de Pesquisas da Amazônia, 2013-03) DELFINA, Márcia Cristina; TESTON, José Augusto
    This study evaluated the Arctiinae fauna of a pasture area in Altamira, Pará, eastern Amazon, using light traps. The moths were captured at every new moon phase, two nights per phase, from December 2008 to November 2010. We evaluated the following parameters: richness, abundance, dominance, constancy, diversity indexes and evenness (Shannon H' and E'; Brillouin H and E), and Berger-Parker dominance (BP). Richness estimates were made by nonparametric procedures: Bootstrap, Chao1, Chao2, Jackknife1, Jackknife2 and Michaelis-Mentem. We captured a total of 910 specimens belonging to 85 species of Arctiinae. Values of parameters for the total period were: H' = 2.58, E' = 0.581, H = 2.45, E = 0.576 and BP = 0.433. Both richness and abundance were higher in 2009-2010, while diversity and Shannon and Brillouin evenness were higher for the year 2008-2009. Estimators predicted an increase between 18.8% to 85.9% in species richness.
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    Palm community transitions along a topographic gradient from floodplain to terra firme in the eastern Amazon
    (Instituto Nacional de Pesquisas da Amazônia, 2015-03) SALM, Rodolfo Aureliano; PRATES, Anderson Sousa; SIMÕES, Nadson Ressyé; FEDER, Lisa
    Palms show clear niche segregation patterns along topographic gradients in tropical forests, with some species associated to terra firme and others to seasonally flooded areas. The aim of this study was to quantitatively describe the fine-scale spatial variation within a palm community, tracking the changes in species' abundance along environmental gradients associated with a perennial stream the eastern Amazon. The study of palm communities was based on 60 forest plots in which all adult palms were counted. We found a total of 566 palms in a community containing 11 species. Furthermore, we found a significant separation in the palm community between seasonally-flooded and terra firme forests. We found a gradient with various densities of the three most abundant palm species within the first 100 m away from the flooded area. Other species were located exclusively in the terra firme forest. The abundance of the six most common species were distributed in relation to humidity gradients from floodplains to terra firme, with palm distribution from the most flood-tolerant to the least flood-tolerant palm species as follows: Euterpe oleracea, Attalea phalerata and Socratea exorrhiza (species with floodplain affinity), Astrocaryum gynacanthum, Astrocaryum aculeatum, Attalea maripa (species with terra firme affinity).
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