O funcionamento da barragem dos reservatorios e resultado das grandes flutuacoes do nivel da agua determinada pelas variacoes sazonais e pela acao antropica. Estas alteracoes provocam mudancas na estrutura e no funcionamento da comunidade zooplanctonica. Os objetivos desse estudo foram comparar a composicao e riqueza de especies da comunidade zooplanctonica ativa e presente no sedimento, e verificar a possivel influencia de variaveis limnologicas na estruturacao da comunidade zooplanctonica ativa e dos ovos de resistencia no reservatorio de Furnas (MG). As coletas foram realizadas mensalmente no periodo de julho de 2013 a fevereiro de 2014. As amostras de zooplancton foram coletadas ao longo da coluna d fagua com uma motobomba (400 litros) e rede de plancton 68 ƒÊm e as variaveis limnologicas foram medidas com um multisensor Horiba U-50. A coleta de sedimento (Kajak) ocorreu de dezembro de 2013 a fevereiro de 2014. Testes de eclosao dos ovos de resistencia foram realizados em laboratorio mantendo-se a temperatura a 25 } 2 ‹C e fotoperiodo de 12/12 horas em camara de incubacao. Houve uma reducao no volume de agua do reservatorio de Furnas devido a menor precipitacao na area de estudo nos ultimos anos. Essa reducao do volume de agua e o aumento das acoes antropicas resultaram no aumento do grau de trofia no reservatorio (mesotrofico), o que pode ter contribuido para a formacao dos ovos de resistencia pelo zooplancton. No local com maior grau de trofia, maior quantidade de macrofitas e onde anteriormente era lancado o esgoto sanitario do municipio de Alfenas, foi observado maior numero de ovos no sedimento do reservatorio e maior riqueza de especies da comunidade zooplanctonica. Comparando a comunidade zooplanctonica ativa e os ovos de resistencia observou-se maior riqueza de especies na coluna d fagua, porem algumas especies foram registradas somente no sedimento o que reforca a importancia da estrategia de dormencia para a manutencao da riqueza de especies da comunidade zooplanctonica ativa do reservatorio, podendo o sedimento ser considerado um repositorio de organismos. / The operation of the dam reservoirs is result of large fluctuations of the water level determined by seasonal variations and by human action. These alterations cause changes in the structure and functioning of zooplanktonic community. The objectives of this study were to compare the composition and species richness of the zooplanktonic community both active and present in the sediment, and verify the possible influence of limnological variables in the structuring of the active zooplanktonic community in the Furnas reservoir (MG). The samples were collected monthly from July 2013 to February 2014. The zooplankton samples were collected along the water column with a suction motor pump (400 liters) and plankton net of 68 μm and the limnological variables were measured with a multisensor Horiba U-50. The samples of sediment (Kajak) occurred from December 2013 to February 2014. Hatching tests of resting eggs were performed in the laboratory maintaining the temperature at 25 ± 2 ° C and photoperiod of 12/12 hours in germination chambers. There was a reduction in the volume of water Furnas reservoir due to lower rainfall in the study area in recent years. This reduction of water volume and the increase in human activities resulted in an increase of the trophic level in the reservoir (mesotrophic), which may have contributed to the formation of resting eggs by zooplankton. On site with higher trophic level, the greater amount of weeds and where it was previously launched the domestic and industrial sewage in the city of Alfenas, there was a higher number of eggs in the reservoir sediment and richest in species of zooplanktonic community. Comparing the active zooplankton community and resting eggs observed richest in species in the water column, but some species were recorded only in the sediment which reinforces the importance of dormancy strategy for the maintenance of species richness of active zooplanktonic community of the reservoir, the sediment being considered a repository of organisms.