Navegando por Autor "Diniz, Leidiane Pereira"
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Item Organochlorine pesticides in the sediment of lacustrine environments (Lower Rio Doce Basin, ES, Brazil).(2023) Kabir, Ibraheem; Sant'Anna, Eneida Maria Eskinazi; Pasa, Vânia; Sant'Anna, Eneida Maria Eskinazi; Almeida, Stéfabo Zorzal de; Diniz, Leidiane PereiraLevels of pesticide were assessed in the sediment of deep and shallow lakes from Lower Rio Doce Basin (ES) to evaluate the levels of selected organochlorine pesticides (OCPs) in the sediment of lacustrine environments (shallow lakes x deep lakes). The catchment area of the studied lacustrine environments is characterized by multiple agricultural activities and human occupations. Sediment samples were collected monthly from October/2018 to February/2020. Total pesticides were analyzed in gas chromatography coupled to mass spectrometry (GC-MS). There were detected five organic pesticides in the sediments, including banned OCPs in developed countries such as DDT and PCBs. Highest values of DDT and PCBs were detected in the sediment of the deep and shallow lakes. No seasonal difference was observed in the concentration of PCOs in lake and shallow lake sediments, indicating that these environments present signs of persistent and long-term contamination. Despite the absence of seasonal influence, the heterogeneity of PCOs in the sediment was different between lakes and shallow lakes, indicating the influence of surface drainage on the concentration of these contaminants in the environments. The presence of already banned organic contaminants were detected, thus raising concerns. More studies are necessary, since these lacustrine environments are used for recreational and water supply purposes.Item A review of 121 years of studies on the freshwater zooplankton of Brazil.(2023) Castilho Noll, Maria Stela Maioli; Meira, Bianca Ramos de; Silva, Edissa Emi Cortez; Sant'Anna, Eneida Maria Eskinazi; Diniz, Leidiane Pereira; Simões, Nadson RessyéA review was carried out on the freshwater zooplankton in Brazil, between 1900 and 2021, based on 1014 studies, and the main trends were pointed. There was an increase of studies from the 1990 s onwards, especially between 2016 and 2020. Most of them addressed ecological research, followed by taxonomical research in the past (mid-1970 s). Field studies were also more numerous than experimental and review ones, but the latter type also increased between 2016 and 2020. Most studies were developed in limnetic regions and in artificial and natural lakes, in contrast to littoral regions, streams and wetlands. Studies on cladocerans were the most numerous in all environments, followed by Copepoda and Rotifera. Protozooplankton was the least studied group, with a predominance of testate amoebae, followed by ciliates, flagellates and naked amoeba studies. We also discuss some aspects of the ecological traits, such as life cycles and life history, population and community dynamics, interactions with the environment, influence of environmental and anthropogenic factors and interspecific interactions. Studies on populations biomass, secondary production, functional ecology, long term duration and molecular analyzes were the main gaps and the next challenges. Finally, it is also necessary to understand the diversity and related variables in different environments that have few or never been studied.Item Towards a synthesis of the biodiversity of freshwater Protozoa, Rotifera, Cladocera, and Copepoda in Brazil.(2022) Loureiro, Lourdes Maria Abdu El-moor; Sant'Anna, Eneida Maria Eskinazi; Diniz, Leidiane Pereira; Simões, Nadson RessyéAlthough Brazil is considered a megadiverse country, its rich freshwater biodiversity is still poorly known. A general overview of to-date knowledge on Protozoa, Rotifera, Cladocera, and Copepoda species and distribution in Brazilian Hydrographic Regions is presented here, based on literature data since the 1890s. Ecological studies provided most of the occurrence records. The results show high richness for all studied biological groups and unequal distribution of the occurrence records, which are substantially influenced by research groups’ location. The data also revealed that Brazilian zooplankton biodiversity still needs to be better studied, taxonomically, although from the beginning of the last century until 1980 these kinds of studies were predominant.