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O equilíbrio dos ecossistemas aquáticos ocorre devido as funções desempenhadas pelo por diferentes comunidades aquáticas, dentre elas o zooplâncton. Neste sentido, o presente estudo objetivou avaliar a riqueza e a densidade da comunidade zooplanctônica do lago urbano do Parque do Ingá. Foi realizada uma amostragem à subsuperfície do lago utilizando-se uma rede de plâncton com 68 µm de abertura de malha. Foram filtrados 100 litros de água. Verificou-se uma maior riqueza de protozoários testáceos e maior densidade de copépodes. Concluiu-se que o fluxo de corrente e a presença de cianobactérias foram determinantes sobre a estrutura da comunidade zooplanctônica.
Este estudo teve por objetivo realizar uma prática de manejo de flora em um Parque urbano, com finalidade de ampliar o conhecimento na área da Ecologia. A prática de manejo foi realizada a partir de levantamento florístico, medidas, dados de densidade e diversidade de uma área delimitada. A maioria das espécies foram identificadas como jovens, com seu estado de conservação entre médio e ruim. Foi identificada uma baixa diversidade. Os alunos vivenciaram um momento de estudo de ecologia de comunidades com técnicas de manejo, importante para formação como futuros biólogos, essencial para a atuação profissional.
One of the major goals in microbial ecology is to understand whether the empirical biogeographic patterns of macroorganisms also apply to microorganisms. Here, we used morphological data from live organisms, along with molecular data, to investigate the importance of spatial factors and environmental variables in influencing ciliate composition from floodplain lakes. Our main goal was to use 2 different approaches (morphological and molecular) to compare ciliate diversity and distribution patterns as well as to compare how these methods differ in their ability to detect distribution patterns and the roles of spatial and environmental factors that shape ciliate assemblages in the 4 largest floodplains in Brazil. Planktonic water samples were gathered from 33 lakes associated with 4 different river floodplain systems in Brazil. We analyzed ciliates in vivo and sequenced surface water DNA using a metabarcoding approach with general eukaryotic primers. We showed that the diversity of operational taxonomic units was much higher than that of morphospecies. Regardless of the method of identification, we found a consistent spatial assembly pattern of ciliate assemblages across the 4 floodplain systems. We also found that environmental filters had a stronger association with the morphological than with the molecular site-by-site dissimilarities. Meanwhile, biogeographic factors and the distance among sites limited the distribution of molecular-based composition, resulting in strong differences among the floodplain lakes analyzed. This finding suggests that ecological research and biomonitoring activities should find an equilibrium between morphological and molecular approaches because each approach provides unique insights.
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