Zooplankton composition and density in the Tucuruí hydroelectric plant reservoir (Pará, Brazil)

• Published in: Research, Society and Development
• Main Authors: Morais, João Vitor de Mota, Pinheiro, Samara Cristina Campelo, Ahndrew, Lisbethe Melo Sckyr, Sousa, Eliane Brabo de, Paes, Eduardo Tavares
• Format: Article in Journal/Newspaper
• Language: Portuguese
• Published: Research, Society and Development 2020
• Subjects: Reservatório amazônico; Rotifera; Copepoda; Reservorio amazónico; Amazonian reservoir; Copepods; Rotifer
• Online Access: https://rsdjournal.org/index.php/rsd/article/view/10766; https://doi.org/10.33448/rsd-v9i12.10766

The study of zooplankton in reservoirs has been increasingly performed due to the role and characteristics of organisms. The Tucuruí reservoir presents few and widely spaced studies generating a gap in the knowledge of the composition and density of zooplankton in that region. Therefore, the objective was to describe the composition and density of the zooplankton in the Tucuruí reservoir in the months of february, july and december 2011. Samples were performed in 10 collection stations along the reservoir. The samples were collected with 64 µm plankton nets. With 156 taxa of zooplanktonic organisms identified, the rotifers had the highest species richness (88), followed by cladocerans (24) and copepods (13). Testaceous amoebae occurred sporadically. The richness varied significantly in relation to the months, and the Simpson index was significantly higher in February, while the density of organisms did not show significant variation. The density was dominated by the species of rotifer Keratella americana and nauplii throughout the study, contributing about 50% of the abundance. Thus, the zooplankton community showed typical composition and density for Amazonian ecosystems, with the rate domain like Rotifera and Copepoda being frequent during sampling. El estudio del zooplancton en reservorios se ha realizado cada vez más debido al papel y las características de los organismos. El embalse de Tucuruí presenta pocos y muy espaciados estudios que generan un vacío en el conocimiento de la composición y densidad del zooplancton en esa región. Por lo tanto, el objetivo fue describir la composición y densidad del zooplancton en el embalse Tucuruí en los meses de febrero, julio y diciembre de 2011. Se realizaron muestreos en 10 estaciones de recolección a lo largo del embalse. Las muestras se recolectaron con redes de plancton de 64 µm. Con 156 taxones de organismos zooplanctónicos identificados, los rotíferos tuvieron la mayor riqueza de especies (88), seguidos de los cladóceros (24) y copépodos (13). Las amebas ...