The study was conducted to assess the community structure of planktonic rotifers and their relation to the environmental impact of Nile tilapia, Oreochromis niloticus (Linaeus, 1758), aquaculture activities (ponds and net-tanks), associated with a Neotropical semiarid reservoir in Brazil. Our hypothesis was that the ecological attributes of the rotifer community were different when considering the influence of fish aquaculture activities. We identified 28 species, with 10 species from the Brachionidae family. The average density and diversity index of rotifers were higher in reservoir stations, with mean values in the ponds approximately 50% lower than those of the reservoir. The microphagous species dominated during all the time, while the raptorial species were accidental in all studied environments. The ponds were represented by four significant indicator species: Brachionus caudatus, B. leydigi, Dicranophoroides caudatus and Testudinella patina and the reservoir by three: B. falcatus, B. havanaensis and Conochilus dossuarius. In general, nine species were significantly associated with some categories of environmental conditions, such as high or low turbidity and low values of conductivity and TDS. Four of the five best bioindicator species belonged to the microphagous genus Brachionus. B. havanaensis indicated five environmental conditions (IndVal > 93.1%), and it appeared to be a key species in this Neotropical semiarid reservoir influenced by aquaculture activities. The dominance of microphagous rotifers suggests a functional redundancy of species in the studied environments. We found that these systems and their management affected the planktonic rotifer community in this region of Brazil by increasing the species richness.
Nas últimas décadas do século XX ocorreu a “inflação do patrimônio” e seexpandiu a noção de sustentabilidade, surgindo o patrimônio natural como uma das respostas à percepção de que a natureza estaria em risco por conta das atividades humanas. Neste artigo tentamos responder, com a ajuda da história ambiental, três indagações decorrentes desses eventos, ou dessas ideias: 1) O que sustentaria a natureza do patrimônio?; 2) O patrimônio natural seria sustentável?; 3) A naturezado patrimônio natural seria sustentável?
Urbanização e o abastecimento de água potável em Londrina-PR no contexto da "era da ecologia" (1970-1980) Urbanization and the supply of potable water in Londrina-PR context of the "age of ecology" (1970-1980) La urbanización y el suministro de agua potable en Londrina-PR en el contexto de la "Era de la Ecología" (1970-1980
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.