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EnglishMarginal lagoons in wetlands, which differ from artificial reservoirs, are subject to water level significant variations and can provide a high diversity of zooplankton. This study sought to determine whether communities of cladocerans and copepods differ in terms of richness, density and food preferences in small artificial reservoirs andmarginal lagoons,which have different hydrological regimes and connections with other aquatic environments. During the dry and rainy seasons, samples were taken from a set of 12 small artificial reservoirs in the northwestern region of the Sao Paulo state (Brazil) and in six marginal lagoons of the Paranapanema River wetland in the southeastern region of the Sao Paulo state (Brazil). We found a greater richness of zooplankton species (observed and estimated) in lagoons than in reservoirs. The species composition was significantly different in both ecosystems, and only cladocerans were more abundant in the lagoons. Although lagoons presented higher gamma diversity than reservoirs, the lagoons had lower beta diversity, reflecting the environment connections in wetlands to organisms’ dispersion. Filter feeders were the most abundant group in both type of environment, but significant differences were observed in omnivores capturing prey, which were denser in reservoirs than in lagoons. The comparison between both kinds of ecosystem showed that zooplanktonic community differs in relation to the richness, density and trophic guild. We suggest that the influence of the hydrodynamics in lagoons, provided by lateral river connections, represents an important force in the aquatic community structuration, resulting in higher species diversity. This study evidences that ecosystems that are subject to connections with other aquatic environments and to water level variations can provide a higher diversity of aquatic communities, and that this kind of ecosystem are important to preserve the aquatic biodiversity. portuguesLagoas marginais em areas alagadas, diferentemente de represas artificiais, estao sujeitas a variacoes significativas de nivel de agua e podem abrigar alta diversidade de especies zooplanctonicas. Este estudo tem como objetivo verificar se em pequenos acudes artificiais e em lagoas marginais, que diferem em seu regime hidrologico e na conexao com outros ambientes aquaticos, as comunidades de cladoceros e de copepodos diferem no que se refere a riqueza, densidade e preferencias alimentares. Durante as estacoes seca e chuvosa, foram obtidas amostras em 12 pequenos acudes artificiais, na regiao noroeste do Estado de Sao Paulo (Brasil), e em seis lagoas marginais ao Rio Paranapanema, na regiao sudeste do Estado de Sao Paulo (Brasil). Encontramos maior riqueza (tanto observada quanto estimada) de especies zooplanctonicas nas lagoas do que nos acudes. A composicao em especies foi estatisticam ente diferente em ambos ecossistemas e apenas os cladoceros foram mais abundantes nas lagoas. Embora tenham apresentado maior diversidade gama, as lagoas apresentaram menor diversidade beta, refletindo o efeito das conexoes entre os ambientes nas areas alagaveis para a dispersao dos organismos.A guilda mais abundante em ambos os ambientes foifiltradores, entretanto, diferenca estatistica foi observada em onivoros que capturam presas, que foram mais abundantes nos acudes do que nas lagoas. A comparacao dos dois tipos de ecosistema mostrou que a comunidade zooplanctonica se deferencia no que se refere a riqueza, densidade e guildas tro ficas. Sugerimos que a influencia na hidrodinâmica das lagoas, proporcionada principalmente pela conexao com o rio lateral, constitui umaforca importante na estruturacao das comunidades aquaticas como a zooplanctonica, promovendo maior diversidade de especies. Este trabalho evidencia que os ecossistemas sujeitos a conexoes com outros ecosistemas aquaticos e a variacoes de nivel de agua apresentam maior diversidade de especies aquaticas, sendo importantes para a manutencao da biodiversidade aquatica.

Comparison among zooplankton communities in hydrologically different lentic ecosystems