{"id":6734,"date":"2022-09-02T10:25:27","date_gmt":"2022-09-02T13:25:27","guid":{"rendered":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/?page_id=6734"},"modified":"2022-12-14T09:30:47","modified_gmt":"2022-12-14T11:30:47","slug":"andrea-sampaio-dias-dr","status":"publish","type":"page","link":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/andrea-sampaio-dias-dr\/","title":{"rendered":"Andr\u00e9a Sampaio Dias – DR"},"content":{"rendered":"

\"faixapos6\"<\/a><\/h2>\n
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Andr\u00e9a Sampaio Dias<\/h2>\n
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No dia 20 de fevereiro de 2020 a aluna do programa de p\u00f3s-gradua\u00e7\u00e3o em Biodiversidade Vegetal e Meio Ambiente, Andr\u00e9a Sampaio Dias, realizou a defesa da tese de doutorado intitulada “Estrutura da comunidade fitoplanct\u00f4nica em reservat\u00f3rios com piscicultura no Estado de S\u00e3o Paulo”, orientada pela Dra. Andr\u00e9a Tucci, PqC\u00a0 do N\u00facleo de Pesquisa em Ficologia do Instituto de Bot\u00e2nica. Na ocasi\u00e3o estiveram presentes como membros da Banca examinadora os Professores doutores Andr\u00e9 Cordeiro Alves dos Santos, Cristina Souza Freire Nordi, Maria do Carmo Carvalho e Jo\u00e3o Alexandre Osti que aprovaram o exame de forma unanime.<\/p>\n

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Estrutura da comunidade fitoplanct\u00f4nica em reservat\u00f3rios com piscicultura no Estado de S\u00e3o Paulo<\/h3>\n
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ABSTRACT<\/strong><\/h4>\n

Fish farming is an economic activity widespread in Brazilian reservoirs due to the good conditions for cultivation, government incentives and low cost-benefit. The analysis of the phytoplankton community and the environmental variables in reservoirs with this practice is relevant to obtain an overview of the ecological characteristics of this environment and allows to monitor possible changes caused by the activity in addition to predicting the effects of environmental changes on the reservoir and its aquatic communities. Based on this, a study was carried out to evaluate the structure of the phytoplankton community and the limnological characteristics of three reservoirs with tilapiculture in net cages in the State of S\u00e3o Paulo. Six stations were sampled: one station in the Chavantes reservoir, three stations in the Nova Avanhandava reservoir and two in the Ilha Solteira reservoir, in two consecutive years, in the periods of March and October 2015 and March and October 2016. For this, the concentrations of total and dissolved nutrients, dissolved oxygen, temperature, pH, conductivity, suspended solids, \u03b1 chlorophyll, Trophic State Index (TSI), cyanotoxins, density, biomass, diversity, richness, composition and classification of the phytoplankton community in Morphology Based Functional Groups (MBFG) were determined. As for the degree of trophy, the three reservoirs were classified as mesotrophic according to the average of the TSIs. The richness in Chavantes was 56 taxa and the phytoplankton community showed low diversity (H ‘= 2 bits.ind-1) and was predominantly made up of Cryptomonas spp. and Rhodomonas lacustris (Cryptophyceae), which are among the five species that describe this system. The biological descriptors were classified in MBFG V and VII which were associated with higher values of water transparency, low water temperatures and the absence of complete mixing of the water column. In the Nova Avanhandava reservoir, the concentrations of total phosphorus and total nitrogen were high, and this result associated with the concentration of the other nutrients reflected in the phytoplankton community that showed a richness of 177 taxa, maximum diversity of H ‘= 3.6 bits.ind-1 and was made up mainly of Cyanobacteria species. The 22 species that describe this reservoir were classified into five MBFG III, IV, V, VI and VII, mainly associated with the highest values of electrical conductivity of the water, both in March 2015 and March 2016, regardless of the sampled points (amount, farm or downstream). Among the species of cyanobacteria, eight are producers of microcystins, a toxin found in high concentrations (above 1.60 \u03bcg L-1) in this reservoir. Is also noted for New Avanhandava, the first record of occurrence of the invading dinoflagellate, Ceratium furcoides, although this record was with low biomass values. In the Ilha Solteira reservoir, 114 taxa were recorded and the greatest diversity H ‘= 3.8 bits.ind-1, the largest contribution of Cryptophyceae and 11 descriptive species classified in five MBFG III, IV, V, VI and VII. The Principal Component and Canonical Correlation Analysis showed, in general, an annual time difference between the seasons, a great correlation of the concentration of nutrients and conductivity with the points and phytoplankton of Nova Avanhandava and correlation with transparency in Chavantes and Ilha Solteira. Despite the fact that the reservoirs have the same degree of trophy, different composition and abundances were registered regarding the phytoplankton community, most likely due to the characteristics of use and occupation of the basin, depth and intensity of the crops. Among the species of cyanobacteria recorded in the reservoirs Dolichospermum circinalis, D. planctonicum, Microcystis aeruginosa, M. protocystis, Planktothrix isothrix, Radiocystis fernandoi e Synechocystis aquatilis are mentioned in the literature as producers of microcystins. Microcystin-LR was detected in all sampled stations and warns of intoxication and bioaccumulation in the crop and the compromise of water quality with possible risks to public health, as they are reservoirs destined also for human supply. Based on the results obtained, we verified that the presence of fish farming activity in network tanks in the Chavantes, Nova Avanhandava and Ilha Solteira reservoirs is promoting changes both in the concentration of the physical and chemical variables of the water and in the phytoplankton community structure with substitution of Cryptophyceae species for Cyanobacteria, with a tendency to increase the biomass of cyanobacteria, especially of toxic species. The implication for this situation is the loss of water quality in these reservoirs and the compromise of fish farming, in addition to the risk to public health.<\/p>\n

Keywords:<\/strong> Ceratium furcoides, phytoplankton, functional groups, mesotrophic, eutrophication, microcistins, pisciculture, net cages<\/p>\n

RESUMO<\/strong><\/h4>\n

A Piscicultura \u00e9 uma atividade econ\u00f4mica difundida nos reservat\u00f3rios brasileiros por conta das boas condi\u00e7\u00f5es para cultivo, incentivo governamental e baixo custo-benef\u00edcio. A an\u00e1lise da comunidade fitoplanct\u00f4nica e das vari\u00e1veis ambientais em reservat\u00f3rios com esta pr\u00e1tica, \u00e9 relevante para se obter uma vis\u00e3o geral das caracter\u00edsticas ecol\u00f3gicas deste ambiente e permite acompanhar poss\u00edveis mudan\u00e7as causadas pela atividade al\u00e9m de, prever os efeitos das mudan\u00e7as ambientais sobre o reservat\u00f3rio e suas comunidades aqu\u00e1ticas. Com base nisso, foi realizado um estudo para avaliar a estrutura da comunidade fitoplanct\u00f4nica e as caracter\u00edsticas limnol\u00f3gicas de tr\u00eas reservat\u00f3rios com tilapicultura em tanques-rede no Estado de S\u00e3o Paulo. Foram amostradas seis esta\u00e7\u00f5es: uma esta\u00e7\u00e3o no reservat\u00f3rio Chavantes, tr\u00eas esta\u00e7\u00f5es no reservat\u00f3rio Nova Avanhandava e duas no reservat\u00f3rio Ilha Solteira, em dois anos consecutivos, nos per\u00edodos de mar\u00e7o e outubro de 2015 e mar\u00e7o e outubro de 2016. Para tanto, foram determinadas as concentra\u00e7\u00f5es de nutrientes totais e dissolvidos, oxig\u00eanio dissolvido, temperatura, pH, condutividade, s\u00f3lidos suspensos, clorofila \u03b1, \u00cdndice de Estado Tr\u00f3fico (IET), cianotoxinas, densidade, biomassa, Diversidade, Riqueza, composi\u00e7\u00e3o e classifica\u00e7\u00e3o da comunidade fitoplanct\u00f4nica em Grupos Funcionais Baseados na Morfologia (GFBM). Quanto ao grau de trofia, os tr\u00eas reservat\u00f3rios foram classificados como mesotr\u00f3ficos de acordo com a m\u00e9dia dos IETs. A riqueza em Chavantes foi de 56 t\u00e1xons e a comunidade fitoplanct\u00f4nica apresentou baixa diversidade (H\u2019=2 bits.ind-1) e foi constitu\u00edda predominantemente por Cryptomonas spp. e Rhodomonas lacustris (Cryptophyceae), que est\u00e3o entre as cinco esp\u00e9cies descritoras deste sistema. As descritoras biol\u00f3gicas foram classificadas nos GFBM V e VII que estiveram associados aos maiores valores de transpar\u00eancia de \u00e1gua, baixas temperaturas de \u00e1gua e a aus\u00eancia de mistura completa da coluna d\u2019\u00e1gua. No reservat\u00f3rio Nova Avanhandava as concentra\u00e7\u00f5es de f\u00f3sforo total e nitrog\u00eanio total estiveram elevadas, e tal resultado associado \u00e0 concentra\u00e7\u00e3o dos demais nutrientes refletiu na comunidade fitoplanct\u00f4nica que apresentou riqueza de 177 t\u00e1xons, diversidade m\u00e1xima de H\u2019=3,6 bits.ind-1 e foi constitu\u00edda principalmente por esp\u00e9cies de Cyanobacteria. As 22 esp\u00e9cies descritoras deste reservat\u00f3rio foram classificadas em cinco GFBM III, IV, V, VI e VII, associadas principalmente aos maiores valores de condutividade el\u00e9trica da \u00e1gua, tanto em mar\u00e7o de 2015 como mar\u00e7o de 2016, independente dos pontos amostrados (montante, fazenda ou jusante). Dentre as esp\u00e9cies de cianobact\u00e9rias, oito s\u00e3o produtoras de microcistinas, toxina encontrada em concentra\u00e7\u00f5es elevadas (acima de 1,60 \u03bcg L-1) neste reservat\u00f3rio. Destaca-se ainda para Nova Avanhandava, o primeiro registro de ocorr\u00eancia do dinoflagelado invasor, Ceratium furcoides, muito embora, esse registro foi com baixos valores de biomassa. No reservat\u00f3rio de Ilha Solteira foi registrada riqueza de 114 t\u00e1xons e a maior diversidade H\u2019=3,8 bits.ind-1, registrou-se a maior contribui\u00e7\u00e3o de Cryptophyceae e 11 esp\u00e9cies descritoras classificadas em cinco GFBM III, IV, V, VI e VII. As An\u00e1lises de Componentes Principais e de Correla\u00e7\u00e3o Can\u00f4nica evidenciaram de forma geral uma diferen\u00e7a temporal anual entre as esta\u00e7\u00f5es, grande correla\u00e7\u00e3o da concentra\u00e7\u00e3o de nutrientes e condutividade com os pontos e fitopl\u00e2ncton de Nova Avanhandava e correla\u00e7\u00e3o com a transpar\u00eancia.\u00a0 Apesar dos reservat\u00f3rios terem o mesmo grau de trofia, registrou-se composi\u00e7\u00e3o e abundancias distintas quanto \u00e0 comunidade fitoplanct\u00f4nica, muito provavelmente em fun\u00e7\u00e3o das caracter\u00edsticas de uso e ocupa\u00e7\u00e3o da bacia, profundidade e intensidade dos cultivos. Dentre as esp\u00e9cies de cianobact\u00e9rias registradas nos reservat\u00f3rios Dolichospermum circinalis, D. planctonicum, Microcystis aeruginosa, M. protocystis, Planktothrix isothrix, Radiocystis fernandoi e Synechocystis aquatilis s\u00e3o citadas na literatura como produtoras de microcistinas. A microcistina-LR foi detectada em todas as esta\u00e7\u00f5es amostradas e alerta para a intoxica\u00e7\u00e3o e bioacumula\u00e7\u00e3o no cultivo e para o comprometimento da qualidade da \u00e1gua com poss\u00edveis riscos \u00e0 sa\u00fade-p\u00fablica, por serem reservat\u00f3rios destinados tamb\u00e9m ao abastecimento humano. Com base nos resultados obtidos, verificamos que a presen\u00e7a da atividade de piscicultura em tanques-rede nos reservat\u00f3rios Chavantes, Nova Avanhandava e Ilha Solteira, est\u00e1 promovendo altera\u00e7\u00f5es tanto na concentra\u00e7\u00e3o das vari\u00e1veis f\u00edsicas e qu\u00edmicas da \u00e1gua, quanto na estrutura comunidade fitoplanct\u00f4nica com substitui\u00e7\u00e3o de esp\u00e9cies de Cryptophyceae para Cyanobacteria, com tend\u00eancia ao aumento da biomassa de cianobact\u00e9rias, em especial de esp\u00e9cies t\u00f3xicas. A implica\u00e7\u00e3o para esta situa\u00e7\u00e3o \u00e9 a perda da qualidade da \u00e1gua nestes reservat\u00f3rios e o comprometimento da piscicultura, al\u00e9m do risco \u00e0 sa\u00fade p\u00fablica.<\/p>\n

Palavras-chave:<\/strong> Ceratium furcoides, fitopl\u00e2ncton, grupos funcionais, mesotr\u00f3fico, eutrofiza\u00e7\u00e3o, microcistinas, piscicultura, tanques-rede<\/p>\n

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\"pdf_grande\"<\/a>Andr\u00e9a Sampaio Dias
\nEstrutura da comunidade fitoplanct\u00f4nica em reservat\u00f3rios com piscicultura no Estado de S\u00e3o Paulo<\/a><\/p>\n

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\u00a0VOLTAR AS DISSERTA\u00c7\u00d5ES E TESES<\/a><\/strong><\/p>\n

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Andr\u00e9a Sampaio Dias No dia 20 de fevereiro de 2020 a aluna do programa de p\u00f3s-gradua\u00e7\u00e3o em Biodiversidade Vegetal e Meio Ambiente, Andr\u00e9a Sampaio Dias, realizou a defesa da tese de doutorado intitulada “Estrutura da comunidade fitoplanct\u00f4nica em reservat\u00f3rios com piscicultura no Estado de S\u00e3o Paulo”, orientada pela Dra. Andr\u00e9a Tucci, PqC\u00a0 do N\u00facleo de […]<\/p>\n","protected":false},"author":95,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/pages\/6734"}],"collection":[{"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/users\/95"}],"replies":[{"embeddable":true,"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/comments?post=6734"}],"version-history":[{"count":4,"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/pages\/6734\/revisions"}],"predecessor-version":[{"id":8234,"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/pages\/6734\/revisions\/8234"}],"wp:attachment":[{"href":"https:\/\/www.infraestruturameioambiente.sp.gov.br\/pgibt\/wp-json\/wp\/v2\/media?parent=6734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}