Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir
ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis raciborskii, Pseudanabaena sp., and Geitlerinema sp.) and of colonial chlorophytes were favored after macrophyte removal, while the abundances of diatoms and flagellates decreased. Our results suggest that removing macrophytes causes dramatic changes in phytoplankton composition and biomass and selects for toxigenic species of cyanobacteria. These changes were probably associated with the disturbance caused by removing the macrophytes, which immediately created new environmental conditions prone to species competition. These findings indicate that the use of mechanical techniques to manage macrophytes should be carefully considered, along with monitoring of harmful species and changes of limnological parameters.
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Sociedade Botânica do Brasil
2018
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oai:scielo:S0102-330620180004005882018-09-05Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoirWojciechowski,JulianaBurda,Tamires MarcelaScheer,Mauricio BergaminiCosta,Elaine Aparecida Dias daFernandes,Luciano Felício chlorophytes cyanobacteria diatoms macrophytes mechanical removal phytoplankton reservoir management ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis raciborskii, Pseudanabaena sp., and Geitlerinema sp.) and of colonial chlorophytes were favored after macrophyte removal, while the abundances of diatoms and flagellates decreased. Our results suggest that removing macrophytes causes dramatic changes in phytoplankton composition and biomass and selects for toxigenic species of cyanobacteria. These changes were probably associated with the disturbance caused by removing the macrophytes, which immediately created new environmental conditions prone to species competition. These findings indicate that the use of mechanical techniques to manage macrophytes should be carefully considered, along with monitoring of harmful species and changes of limnological parameters.info:eu-repo/semantics/openAccessSociedade Botânica do BrasilActa Botanica Brasilica v.32 n.4 20182018-12-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400588en10.1590/0102-33062018abb0015 |
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Wojciechowski,Juliana Burda,Tamires Marcela Scheer,Mauricio Bergamini Costa,Elaine Aparecida Dias da Fernandes,Luciano Felício |
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Wojciechowski,Juliana Burda,Tamires Marcela Scheer,Mauricio Bergamini Costa,Elaine Aparecida Dias da Fernandes,Luciano Felício Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
author_facet |
Wojciechowski,Juliana Burda,Tamires Marcela Scheer,Mauricio Bergamini Costa,Elaine Aparecida Dias da Fernandes,Luciano Felício |
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Wojciechowski,Juliana |
title |
Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
title_short |
Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
title_full |
Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
title_fullStr |
Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
title_full_unstemmed |
Potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
title_sort |
potential effects of mechanically removing macrophytes on the phytoplankton community of a subtropical reservoir |
description |
ABSTRACT Intensive growth of aquatic macrophytes interferes with water quality and ecosystem dynamics worldwide. Although mechanically removing macrophytes is the most commonly used method for their eradication, it can also cause undesirable disturbances in aquatic reservoir communities. We performed laboratory incubations of phytoplankton sampled before and after macrophytes were mechanically removed from the Piraquara II reservoir, South Brazil. We analyzed changes in growth and composition of the main phytoplankton groups with respect to nutrient shifting. Prior to removing the macrophytes, the phytoplankton community was dominated by low cell abundances of diatoms and flagellates. In contrast, growth rates of cyanobacteria (mainly Cylindrospermopsis raciborskii, Pseudanabaena sp., and Geitlerinema sp.) and of colonial chlorophytes were favored after macrophyte removal, while the abundances of diatoms and flagellates decreased. Our results suggest that removing macrophytes causes dramatic changes in phytoplankton composition and biomass and selects for toxigenic species of cyanobacteria. These changes were probably associated with the disturbance caused by removing the macrophytes, which immediately created new environmental conditions prone to species competition. These findings indicate that the use of mechanical techniques to manage macrophytes should be carefully considered, along with monitoring of harmful species and changes of limnological parameters. |
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Sociedade Botânica do Brasil |
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2018 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400588 |
work_keys_str_mv |
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