Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
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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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) |
repository.mail.fl_str_mv |
|
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1808128791525982208 |