2020-02-132020-02-132019-07-17REIS, Thayane Porto. Efeito do tamanho da malha de redes de plâncton sobre os parâmetros ecológicos de rotíferos do gênero KERATELLA. Orientador: José Eduardo Martinelli Filho. Coorientador: Alysson Antônio da Costa Leite. 2019. 36 f. Trabalho de Curso (Bacharelado em Oceanografia) - Faculdade de Oceanografia, Instituto de Geociências, Universidade Federal do Pará, Belém, 2019. Disponível em: https://bdm.ufpa.br:8443/jspui/handle/prefix/2923. Acesso em:.https://bdm.ufpa.br/handle/prefix/2923Zooplankton is one of the main ecological compartments of an aquatic community and is composed mainly by microcrustaceans and rotiferans. Between the zooplanktonic groups, the rotifers are highlighted due to its high diversity, abundance and richness, as well as its small size in relation to the microcrustaceans, which are larger and easily catch by conventional plankton nets. As a consequence, rotifers may have some ecological parameters underestimated due to inadequate plankton net mesh sizes. This study analyzed the effect of two plankton net mesh over the size, density and biomass of the dominant species from the Keratella genus in the Tucuruí reservoir (Pará state, Brazil). Sampling was performed during 2015, at the rainy and dry seasons and over 12 sampling stations along the reservoir, by concomitant vertical tows with 20 and 64 μm plankton nets. During the laboratory analysis, a minimum of 30 specimens were measured at each sample. Density was estimated through the analysis of sample aliquots and the biomass through the method described by Ruttner-Kolisko. The main statistical testes applied were the Mann-Whtiney test and the PERMANOVA. A total of 48 samples were analyzed. The highest density (1,861 ± 1,582 org.m-³) and biomass (7.026 ± 6.145 μgPS.m-³) values occurred during the rainy season for the 64 μm mesh, as possible consequence of continental nutrient input. For the 20 μm net, the highest density (2,346 ± 4,286 org.m-³) and biomass (8.021 ± 14.111 μgPS.m-³) values were described during the dry season. The upstream stations showed higher density and biomass in relation to the downstream stations, as a possible consequence of the lentic system attributes, or even eutrophication, since small cities without sewage treatment are located at the margins of the reservoirs. Smaller specimens of both K. americana and K. cochlearis occurred at the smaller mesh net. Thus, the 20 μm mesh net selected smaller organisms, and the 64 μm network selected larger organisms. However, seasonality and spatial variability were more important to explain the variations on density and biomass of the Keratella genus, than mesh nets.Acesso AbertoZooplânctonReservatório TropicalSeleçãoAmazôniaCNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA BIOLOGICATrabalho de Curso - Graduação - Monografia