Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Acta Limnologica Brasiliensia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2018000100804 |
Resumo: | Abstract Aim: This study aimed to evaluate the carbon dioxide (CO2) dynamics in tropical semi-arid reservoirs during a prolonged drought period as well as to test if the trophic state affects the CO2 saturation. Methods This study was performed in four reservoirs located in the tropical semi-arid region in the northeast of Brazil. All samplings were performed between 9 and 12 am using a Van Dorn Bottle. Samples for partial pressure of carbon dioxide (pCO2 ) measurements were taken in the sub-surface as well as samples for total phosphorus and chlorophyll-a. Correlation analysis and linear regression were used to detect relations among the calculated pCO2, water volume and chlorophyll-a. Results The water level reduction due to atypical droughts caused chlorophyll-a concentrations to increase, which in turn, led to CO2 reduction in the water. However, CO2 concentrations were very variable and an alternation between CO2 sub-saturation and super-saturation conditions was observed. This paper showed that water volume and chlorophyll-a were important regulators of CO2 in the water, as well as important carbon balance predictors in the tropical semiarid reservoirs. Conclusions The results of this paper indicate that the eutrophication allied to drastic water level reductions lead to a tendency of autotrophic metabolism of these systems. |
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Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturationcarbon dioxide partial pressure (pCO2)carbon sinkcarbon sourceeutrophicationreservoirs Abstract Aim: This study aimed to evaluate the carbon dioxide (CO2) dynamics in tropical semi-arid reservoirs during a prolonged drought period as well as to test if the trophic state affects the CO2 saturation. Methods This study was performed in four reservoirs located in the tropical semi-arid region in the northeast of Brazil. All samplings were performed between 9 and 12 am using a Van Dorn Bottle. Samples for partial pressure of carbon dioxide (pCO2 ) measurements were taken in the sub-surface as well as samples for total phosphorus and chlorophyll-a. Correlation analysis and linear regression were used to detect relations among the calculated pCO2, water volume and chlorophyll-a. Results The water level reduction due to atypical droughts caused chlorophyll-a concentrations to increase, which in turn, led to CO2 reduction in the water. However, CO2 concentrations were very variable and an alternation between CO2 sub-saturation and super-saturation conditions was observed. This paper showed that water volume and chlorophyll-a were important regulators of CO2 in the water, as well as important carbon balance predictors in the tropical semiarid reservoirs. Conclusions The results of this paper indicate that the eutrophication allied to drastic water level reductions lead to a tendency of autotrophic metabolism of these systems.Associação Brasileira de Limnologia2018-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2018000100804Acta Limnologica Brasiliensia v.30 2018reponame:Acta Limnologica Brasiliensia (Online)instname:Associação Brasileira de Limnologia (ABL)instacron:ABL10.1590/s2179-975x1517info:eu-repo/semantics/openAccessMendonça Júnior,Jurandir Rodrigues deAmado,André MegaliVidal,Luciana de OliveiraMattos,ArthurBecker,Vanessaeng2018-03-29T00:00:00Zoai:scielo:S2179-975X2018000100804Revistahttp://www.ablimno.org.br/publiActa.phphttps://old.scielo.br/oai/scielo-oai.php||actalb@rc.unesp.br2179-975X0102-6712opendoar:2018-03-29T00:00Acta Limnologica Brasiliensia (Online) - Associação Brasileira de Limnologia (ABL)false |
dc.title.none.fl_str_mv |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
title |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
spellingShingle |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation Mendonça Júnior,Jurandir Rodrigues de carbon dioxide partial pressure (pCO2) carbon sink carbon source eutrophication reservoirs |
title_short |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
title_full |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
title_fullStr |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
title_full_unstemmed |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
title_sort |
Extreme droughts drive tropical semi-arid eutrophic reservoirs towards CO2 sub-saturation |
author |
Mendonça Júnior,Jurandir Rodrigues de |
author_facet |
Mendonça Júnior,Jurandir Rodrigues de Amado,André Megali Vidal,Luciana de Oliveira Mattos,Arthur Becker,Vanessa |
author_role |
author |
author2 |
Amado,André Megali Vidal,Luciana de Oliveira Mattos,Arthur Becker,Vanessa |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Mendonça Júnior,Jurandir Rodrigues de Amado,André Megali Vidal,Luciana de Oliveira Mattos,Arthur Becker,Vanessa |
dc.subject.por.fl_str_mv |
carbon dioxide partial pressure (pCO2) carbon sink carbon source eutrophication reservoirs |
topic |
carbon dioxide partial pressure (pCO2) carbon sink carbon source eutrophication reservoirs |
description |
Abstract Aim: This study aimed to evaluate the carbon dioxide (CO2) dynamics in tropical semi-arid reservoirs during a prolonged drought period as well as to test if the trophic state affects the CO2 saturation. Methods This study was performed in four reservoirs located in the tropical semi-arid region in the northeast of Brazil. All samplings were performed between 9 and 12 am using a Van Dorn Bottle. Samples for partial pressure of carbon dioxide (pCO2 ) measurements were taken in the sub-surface as well as samples for total phosphorus and chlorophyll-a. Correlation analysis and linear regression were used to detect relations among the calculated pCO2, water volume and chlorophyll-a. Results The water level reduction due to atypical droughts caused chlorophyll-a concentrations to increase, which in turn, led to CO2 reduction in the water. However, CO2 concentrations were very variable and an alternation between CO2 sub-saturation and super-saturation conditions was observed. This paper showed that water volume and chlorophyll-a were important regulators of CO2 in the water, as well as important carbon balance predictors in the tropical semiarid reservoirs. Conclusions The results of this paper indicate that the eutrophication allied to drastic water level reductions lead to a tendency of autotrophic metabolism of these systems. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2018000100804 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2018000100804 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/s2179-975x1517 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Limnologia |
publisher.none.fl_str_mv |
Associação Brasileira de Limnologia |
dc.source.none.fl_str_mv |
Acta Limnologica Brasiliensia v.30 2018 reponame:Acta Limnologica Brasiliensia (Online) instname:Associação Brasileira de Limnologia (ABL) instacron:ABL |
instname_str |
Associação Brasileira de Limnologia (ABL) |
instacron_str |
ABL |
institution |
ABL |
reponame_str |
Acta Limnologica Brasiliensia (Online) |
collection |
Acta Limnologica Brasiliensia (Online) |
repository.name.fl_str_mv |
Acta Limnologica Brasiliensia (Online) - Associação Brasileira de Limnologia (ABL) |
repository.mail.fl_str_mv |
||actalb@rc.unesp.br |
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1754212637268246528 |