Avaliação dos efeitos genotóxicos e contagem diferencial da série branca em indivíduos de Astyanax bimaculatus (Pices: Characidae) expostos a diferentes condições ambientais

Oliveira, Fernando Alves de; Morais, Tobias Pereira de; Grassi, Luiz Eduardo Aparecido

doi:10.5935/ambiencia.2018.03.13

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“…The genotoxicity indices of the bioassay with A. lacustris observed in the Vitória and Rosário streams were signi cantly different from the negative control, con rming a higher number of genotoxic damage from the waters of these two streams. In the evaluation of sh species in situ, nuclear invagination was the most evident alteration in all sh species; this being the rst response of the organism when detecting chromosomal imperfections, initiating a process of repair and/or elimination of the affected area, resulting in imperfections in the membrane before nishing the process and characterized by nuclear anomalies (Thomé et al 2016;Oliveira et al 2018). Thus, different land uses associated with agricultural activities such as pastures and sugarcane cultivation may variably affect the environmental integrity of water bodies, and later the biota of streams.…”

Section: Discussionmentioning

confidence: 99%

Environmental diagnosis of water quality in situ and ex situ in streams in Upper Paraná River Basin, Brazil

Meira

Silva

Viana

et al. 2021

Preprint

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The aim of this study was to (i) evaluate water quality using limnological parameters in three streams belonging to the Ivinhema River basin, (ii) investigate the composition and structure of the landscape around the locations sampled and their possible contribution to changes in water quality, (iii) investigate genotoxicity in fish in situ as environmental bioindicators, and (iv) evaluate the cytotoxic and genotoxic potential of water through bioassays in animal and plant models. A total of seven fish species were sampled in situ as bioindicators of environmental toxicogenetic damage: Astyanax fasciatus, Astyanax lacustris, Cyphocharax modestus, Moenkhausia forestii, Piabina argentea, Psellogrammus kennedyi, and Hypostomus ancistroides. Four types of nuclear and one cytoplasmic alteration were observed, with nuclear invagination being the most frequent. Animal bioassays showed five types of nuclear and one cytoplasmic alteration. In the plant bioassay, a reduction in germination and cell division was observed, indicating the cytotoxic and genotoxic effects of the water for Allium cepa cells. Thus, genotoxic alterations in fish and plant bioassays may reflect the different types of land use and cover around streams and the conversion of forest fragments into agricultural areas, mainly due to the expansion of sugarcane crops. The evaluation of the toxicogenetic status of the three streams is essential to emphasize the need to create projects to recover the native vegetation cover, which would improve the quality of the habitat and ensure the permanence of native species.

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Section: Discussionmentioning

confidence: 99%