2019-09-242019-09-242019-07-11SIMI, Bruno. Biomassa e produção secundária de Cladocera (crustácea: branchiopoda) no rio Curuá-una, Pará. Orientador: José Eduardo Martinelli Filho. Coorientadora: Brenda Natasha Souza Costa. 2019. 35 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/jspui/handle/prefix/2100. Acesso em:.https://bdm.ufpa.br/jspui/handle/prefix/2100Zooplankton from freshwater environments have a high adaptation capacity to environmental changes due to its fast Community dynamics as a consequence for the accelerated death and reproduction rates. A great effort on the study of zooplanktonic communities was carried to understand its important roles, since it is presented in different trophic compartments. Density, biomass and yield were estimated to understand the importance of cladocerans in Amazonian continental ecosystems in order to understand the importance of cladocerans in Amazonian aquatic ecosystems, several ecological variables were analyzed. Sampling was performed during 2015, at both dry and rainy seasons, at eight sampling stations distributed upstream and downstream the Curuá-Una reservoir, located at Santarém municipality, Pará state. Plankton samples were collected by vertical tows by 60 μm mesh net and preserved by a neutralized 4% formaldehyde solution. For the quantitative analysis, a minimum of 150 individuals were counted. Biomass and secondary production were indirectly calculated, through length/weight regressions available at the literature. Univariate and multivariate statistical analysis were performed in order to verify the importance of seasonality, sampling station location and other variables for the biomass and production of cladocerans. A total of 19 taxa were identified: the rainy period was dominated by Bosmina hagmanni, Bosminopsis deitersi, Ceriodaphnia cornuta, Diaphanosoma birgei and Holopedium, while the dry season was dominated by Alona yara, Bosmina hagmanni, Bosminopsis deitersi, Ceriodaphnia cornuta, Diaphanosoma birgei and Moina micrura. Cladocerans density was between 0.1 and 4972.7 org/m³ with a mean of 509.7 ± 1285.9 org/m³ and was correlated with depth, temperature, concentrations of phosphorus, clorophyll-a, dissolved oxygen while biomass and production were correlated with 4 variables. The cladoceran Community is probably already adapted to the reservoir and river compartmentation, since only H. amazonicum and D. birgei were considered ecological indicators of seasonality and compartmentation.Acesso AbertoReservatórioUsina HidroelétricaZooplânctonAmazôniaCNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA BIOLOGICA::INTERACAO ENTRE OS ORGANISMOS MARINHOS E OS PARAMETROS AMBIENTAISTrabalho de Curso - Graduação - Monografia