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So, cyanobacteria have found propitious conditions for proliferation, provoking significant ecological imbalances. Cyanobacteria produce cyanotoxins, which are harmful to life, and compounds like 2-methylisoborneol and geosmin that affect water's taste and odor. This study analyzed a long-term database of important environmental parameters from a tropical reservoir in S\u00e3o Paulo State, Brazil. The statistical methods of correlation matrices and principal component analysis were used. Data analysis revealed a significant relationship between cyanobacteria growth and high levels of phosphate and nitrogen. Furthermore, positive correlations were found among concentrations of biocidal elements like antimony, arsenic, and selenium related to cyanobacterial bloomings. These correlations can be attributed to agricultural wastewaters and\/or possible algicide used to control these microorganisms.<\/jats:p>","DOI":"10.2166\/wst.2024.039","type":"journal-article","created":{"date-parts":[[2024,2,8]],"date-time":"2024-02-08T15:26:00Z","timestamp":1707405960000},"page":"1240-1251","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":0,"title":["Statistical evaluation of trends of water quality monitoring parameters relevant to cyanobacterial blooms in the urban tropical reservoir"],"prefix":"10.2166","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-4587-3477","authenticated-orcid":false,"given":"Antonio Francisco","family":"Francisco da Silva Junior","sequence":"first","affiliation":[{"name":"1 Instituto de Ci\u00eancias Ambientais, Qu\u00edmicas e Farmac\u00eauticas, Universidade Federal de S\u00e3o Paulo, Rua S\u00e3o Nicolau, 210 \u2013 bairro centro, Diadema, SP 09913-030, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8600-7622","authenticated-orcid":false,"given":"Katia","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"1 Instituto de Ci\u00eancias Ambientais, Qu\u00edmicas e Farmac\u00eauticas, Universidade Federal de S\u00e3o Paulo, Rua S\u00e3o Nicolau, 210 \u2013 bairro centro, Diadema, SP 09913-030, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6132-4397","authenticated-orcid":false,"given":"Jos\u00e9 Erm\u00edrio Ferreira de","family":"Moraes","sequence":"additional","affiliation":[{"name":"1 Instituto de Ci\u00eancias Ambientais, Qu\u00edmicas e Farmac\u00eauticas, Universidade Federal de S\u00e3o Paulo, Rua S\u00e3o Nicolau, 210 \u2013 bairro centro, Diadema, SP 09913-030, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1105-5440","authenticated-orcid":false,"given":"Werner Siegfried","family":"Hanisch","sequence":"additional","affiliation":[{"name":"1 Instituto de Ci\u00eancias Ambientais, Qu\u00edmicas e Farmac\u00eauticas, Universidade Federal de S\u00e3o Paulo, Rua S\u00e3o Nicolau, 210 \u2013 bairro centro, Diadema, SP 09913-030, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"945","published-online":{"date-parts":[[2024,2,8]]},"reference":[{"key":"key-10.2166\/wst.2024.039-1","unstructured":"ANA 2021 Reservoir operation data SIN. 2021. 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