Navegando por Autor "BECKMAN, Ruana Aretha Farias Santiago"

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Riqueza e dinâmica espaço-temporal de minhocas (Annelida, Oligochaeta) em um fragmento florestal.
(Universidade Federal do Pará, 2019-07-02) BECKMAN, Ruana Aretha Farias Santiago; LAVELLE, Patrick Marie; http://lattes.cnpq.br/5850683517396587; MARTINS, Marlúcia Bonifácio; http://lattes.cnpq.br/8882047165338427
The richness, distribution and abundance of Oligochaeta species were analyzed in relation to environmental parameters (internal forest precipitation, litter quantity, texture, pH and soil moisture) during 15 months in an area located in the peri-urban region of the municipality of Belém, state of Pará, Brazil, that belongs to Embrapa Eastern Amazon state company with a reserve area that corresponds to 2,706 hectares. In this study were found eight species: Pontoscolex corethrurus, Muller 1857, four species not been described yet and another 3 not determined due to the lack of characters required for identification. Species richness approached that found in other Amazon forest sites, however, most species occured in low abundance and with sparse distribution. It was also noted low functional diversity with all species belonging to the endogenous ecological category. In the study, the predominant species was Pontoscolex corethrurus, which represented 96.94% of the total density while the others summed up 3.06%. P. coretrhurus was dominant in all points in the site and in all periods. Because of this, it was the only species studied in relation to soil and climate attributes. In this study their abundance responded significantly to the internal precipitation while litter quantity, soil texture, pH and soil moisture did not show considerable effects. Demographics showed that this is an Oligochaeta species that can remain on the soil all year long. It also mantains continued population development with their cocoons producing in three months of year. Although the number of species detected did not show drastic reduction, the high dominance of P. corethrurus, the low functional diversity, the rarity and dispersion of native species spatio-temporal distributions offer clear indications for biodiversity loss in soil fauna in this forest remnant. Possibly this is accompanied by loss of soil ecosystem functions, because of isolation and surrounding urbanization.