Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUnivesidade Federal do Espírito Santo – UFES-
Autor(es): dc.contributorInstituto de Botânica-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorZorzal-Almeida, Stéfano-
Autor(es): dc.creatorBartozek, Elaine C. Rodrigues [UNESP]-
Autor(es): dc.creatorBicudo, Denise C. [UNESP]-
Data de aceite: dc.date.accessioned2022-08-04T22:10:28Z-
Data de disponibilização: dc.date.available2022-08-04T22:10:28Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2021-10-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.envpol.2021.117778-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/221980-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/221980-
Descrição: dc.descriptionEutrophication is one of the most widespread causes of biotic homogenization in freshwater ecosystems. Biotic homogenization can be characterized as reductions in local diversity (alpha) and occupation of available niches by more generalist species. Beta diversity is expected to decrease in more homogeneous communities, however, there is no consensus on how it responds to eutrophication. We used a space-for-time approach to analyze the process of biotic homogenization on diatom assemblages in response to eutrophication in tropical reservoirs ranging from oligotrophic to hypereutrophic conditions. Diatom assemblages were analyzed in phytoplankton and surface sediment from 12 reservoirs with different trophic levels. We calculated total beta diversity and turnover and nestedness components and used regressions to analyze their relationships with productivity differences (without distance effects). Total beta diversity had a positive influence of the trophic gradient, whereas turnover was not related to eutrophication. However, we found that eutrophication and lower species richness (alpha diversity) led to increasing rates of the nestedness component. We also observed that the homogenization process was not characterized by invasion of new species, but, on the contrary, by filtering nutrient-rich tolerant species also present in oligo-mesotrophic reservoirs and able to occupy available niches in the eutrophic reservoirs. These findings (increase in nestedness, decrease in alpha diversity, and development of tolerant species) suggest that biotic homogenization is leading to a simplification of diatom assemblages in tropical reservoirs, making assemblages from eutrophic and hypereutrophic reservoirs a subset of assemblages from oligotrophic and mesotrophic ones.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionUnivesidade Federal do Espírito Santo – UFES, Av. Fernando Ferrari, 519-
Descrição: dc.descriptionInstituto de Botânica Department of Ecology, Av. Miguel Estéfano 3687-
Descrição: dc.descriptionUniversidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Av. 24A, 1515, Rio Claro, SP, campus-
Descrição: dc.descriptionUniversidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Av. 24A, 1515, Rio Claro, SP, campus-
Descrição: dc.descriptionFAPESP: 2009/53898-9-
Descrição: dc.descriptionFAPESP: 2013/14337-7-
Descrição: dc.descriptionFAPESP: 2013/23703-7-
Descrição: dc.descriptionCNPq: 310176/2019-0-
Idioma: dc.languageen-
Relação: dc.relationEnvironmental Pollution-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBeta diversity-
Palavras-chave: dc.subjectBiodiversity-
Palavras-chave: dc.subjectNestedness-
Palavras-chave: dc.subjectTrophic gradient-
Título: dc.titleHomogenization of diatom assemblages is driven by eutrophication in tropical reservoirs-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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