Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs

Detalhes bibliográficos
Autor(a) principal: Zorzal-Almeida, Stéfano
Data de Publicação: 2021
Outros Autores: Bartozek, Elaine C. Rodrigues [UNESP], Bicudo, Denise C. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.envpol.2021.117778
http://hdl.handle.net/11449/221980
Resumo: Eutrophication 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.
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spelling Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirsBeta diversityBiodiversityNestednessTrophic gradientEutrophication 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univesidade Federal do Espírito Santo – UFES, Av. Fernando Ferrari, 519Instituto de Botânica Department of Ecology, Av. Miguel Estéfano 3687Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Av. 24A, 1515, Rio Claro, SP, campusUniversidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Av. 24A, 1515, Rio Claro, SP, campusFAPESP: 2009/53898-9FAPESP: 2013/14337-7FAPESP: 2013/23703-7CNPq: 310176/2019-0Univesidade Federal do Espírito Santo – UFESInstituto de BotânicaUniversidade Estadual Paulista (UNESP)Zorzal-Almeida, StéfanoBartozek, Elaine C. Rodrigues [UNESP]Bicudo, Denise C. [UNESP]2022-04-28T19:41:38Z2022-04-28T19:41:38Z2021-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.envpol.2021.117778Environmental Pollution, v. 288.1873-64240269-7491http://hdl.handle.net/11449/22198010.1016/j.envpol.2021.1177782-s2.0-85110464656Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEnvironmental Pollutioninfo:eu-repo/semantics/openAccess2022-04-28T19:41:38Zoai:repositorio.unesp.br:11449/221980Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:19:43.385761Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
title Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
spellingShingle Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
Zorzal-Almeida, Stéfano
Beta diversity
Biodiversity
Nestedness
Trophic gradient
title_short Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
title_full Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
title_fullStr Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
title_full_unstemmed Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
title_sort Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
author Zorzal-Almeida, Stéfano
author_facet Zorzal-Almeida, Stéfano
Bartozek, Elaine C. Rodrigues [UNESP]
Bicudo, Denise C. [UNESP]
author_role author
author2 Bartozek, Elaine C. Rodrigues [UNESP]
Bicudo, Denise C. [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Univesidade Federal do Espírito Santo – UFES
Instituto de Botânica
Universidade Estadual Paulista (UNESP)
dc.contributor.author.fl_str_mv Zorzal-Almeida, Stéfano
Bartozek, Elaine C. Rodrigues [UNESP]
Bicudo, Denise C. [UNESP]
dc.subject.por.fl_str_mv Beta diversity
Biodiversity
Nestedness
Trophic gradient
topic Beta diversity
Biodiversity
Nestedness
Trophic gradient
description Eutrophication 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.
publishDate 2021
dc.date.none.fl_str_mv 2021-11-01
2022-04-28T19:41:38Z
2022-04-28T19:41:38Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.envpol.2021.117778
Environmental Pollution, v. 288.
1873-6424
0269-7491
http://hdl.handle.net/11449/221980
10.1016/j.envpol.2021.117778
2-s2.0-85110464656
url http://dx.doi.org/10.1016/j.envpol.2021.117778
http://hdl.handle.net/11449/221980
identifier_str_mv Environmental Pollution, v. 288.
1873-6424
0269-7491
10.1016/j.envpol.2021.117778
2-s2.0-85110464656
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Environmental Pollution
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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