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Batistuzzo S, Marcon A, Navoni J, Galvão M, Do Amaral V, Panosso R. Micronucleus and nuclear abnormality frequency in oral mucosa cells from a population exposed to natural radioactivity. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.06.1805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Eskinazi-Sant'Anna EM, Menezes R, Costa IS, Araújo M, Panosso R, Attayde JL. Zooplankton assemblages in eutrophic reservoirs of the Brazilian semi-arid. BRAZ J BIOL 2013; 73:37-52. [PMID: 23644787 DOI: 10.1590/s1519-69842013000100006] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 04/10/2012] [Indexed: 11/22/2022] Open
Abstract
Species composition, density, and temporal dynamics of zooplankton were studied in six reservoirs in a semi-arid region in tropical northeastern Brazil (Rio Grande do Norte state). All the reservoirs are highly eutrophic, with high contents of total nitrogen (minimum of 1200 µg.L-1) and total phosphorus (minimum of 10 µg.L-1), and extremely high algal biomass was registered (surpassing 20 µg Chl a.L-1). All the reservoirs showed an enduring condition of high turbidity and phytoplankton assemblages dominated by cyanobacteria. Zooplankton also showed quantitative patterns suggestive of eutrophic conditions, expressed by high densities, mainly in Passagem das Traíras and Sabugi reservoirs. A spatial differentiation in the composition of the zooplankton community was registered. Rotifers (especially Keratella tropica, Brachionus havanensis, and Keratella americana) were the dominant forms in the zooplankton community of Itans, Passagem das Traíras, and Sabugi reservoirs, while calanoid copepods (mainly Notodiaptomus cearensis) dominated in the Armando Ribeiro, Gargalheiras, and Parelhas systems. The existence of novel relationships in zooplankton community composition in eutrophic reservoirs in this tropical semi-arid region must be considered in designating zooplankton indicators of eutrophic conditions.
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Affiliation(s)
- EM. Eskinazi-Sant'Anna
- Universidade Federal do Rio Grande do Norte, Brazil; Universidade Federal de Ouro Preto, Brazil
| | - R. Menezes
- Universidade Federal de Ouro Preto, Brazil
| | - IS. Costa
- Universidade Federal do Rio Grande do Norte, Brazil
| | - M. Araújo
- Universidade Federal do Rio Grande do Norte, Brazil
| | - R. Panosso
- Universidade Federal do Rio Grande do Norte, Brazil
| | - JL. Attayde
- Universidade Federal do Rio Grande do Norte, Brazil
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