Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10451/45307 |
Resumo: | We hypothesize that the thalli of the green-algal, CO2-sensitive lichen Usnea rubicunda (Stirton) undergo significant structural alterations as a biological response indicating increased CO2 emissions. To test that, U. rubicunda thalli were transplanted from a reference site with no volcanism into 36 sites distributed within the volcanically active Furnas caldera, encompassing the gradient of soil diffuse CO2 degassing areas (700 t d−1 of hydrothermal CO2). After 6 months of exposure in similar macroclimatic conditions, both Furnas transplants and samples kept at the reference site were retrieved for histology to assess thalli structure and the proportion between the symbionts. On average, cross-sections of Furnas thalli were significantly thicker than reference, owing mostly to the fungal layers of medulla and central cord. The latter occupied a significantly greater than reference relative volumetric density despite a smaller than reference relative percentage of algal occupation on Furnas thalli. These results reveal a positive and time-integrated response of U. rubicunda to the greater availability of CO2 from hydrothermal emissions in the volcanic environment, translated in greater efficiency of the algae in sustaining the fungal biomass. Histomorphometric structural alterations in the heteromerous thalli of U. rubicunda are suitable response biomarkers with potential to indicate a global rise of CO2 levels in natural environments. |
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Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic areaUsnea rubicundavolcanismhydrothermal emissionscarbon dioxidehistologybiomarkersWe hypothesize that the thalli of the green-algal, CO2-sensitive lichen Usnea rubicunda (Stirton) undergo significant structural alterations as a biological response indicating increased CO2 emissions. To test that, U. rubicunda thalli were transplanted from a reference site with no volcanism into 36 sites distributed within the volcanically active Furnas caldera, encompassing the gradient of soil diffuse CO2 degassing areas (700 t d−1 of hydrothermal CO2). After 6 months of exposure in similar macroclimatic conditions, both Furnas transplants and samples kept at the reference site were retrieved for histology to assess thalli structure and the proportion between the symbionts. On average, cross-sections of Furnas thalli were significantly thicker than reference, owing mostly to the fungal layers of medulla and central cord. The latter occupied a significantly greater than reference relative volumetric density despite a smaller than reference relative percentage of algal occupation on Furnas thalli. These results reveal a positive and time-integrated response of U. rubicunda to the greater availability of CO2 from hydrothermal emissions in the volcanic environment, translated in greater efficiency of the algae in sustaining the fungal biomass. Histomorphometric structural alterations in the heteromerous thalli of U. rubicunda are suitable response biomarkers with potential to indicate a global rise of CO2 levels in natural environments.ElsevierRepositório da Universidade de LisboaBernardo, FilipeRocha, TâniaBranquinho, CristinaGarcia, PatríciaRodrigues, Armindo2022-07-01T00:30:26Z2020-072020-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/45307engF.Bernardo; T.Rocha; C.Branquinho; P.Garcia; A.Rodrigues.2020Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area. https://doi.org/10.1016/j.ecolind.2020.10632610.1016/j.ecolind.2020.106326info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:47:00Zoai:repositorio.ul.pt:10451/45307Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:57:45.966252Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
title |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
spellingShingle |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area Bernardo, Filipe Usnea rubicunda volcanism hydrothermal emissions carbon dioxide histology biomarkers |
title_short |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
title_full |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
title_fullStr |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
title_full_unstemmed |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
title_sort |
Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area |
author |
Bernardo, Filipe |
author_facet |
Bernardo, Filipe Rocha, Tânia Branquinho, Cristina Garcia, Patrícia Rodrigues, Armindo |
author_role |
author |
author2 |
Rocha, Tânia Branquinho, Cristina Garcia, Patrícia Rodrigues, Armindo |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Bernardo, Filipe Rocha, Tânia Branquinho, Cristina Garcia, Patrícia Rodrigues, Armindo |
dc.subject.por.fl_str_mv |
Usnea rubicunda volcanism hydrothermal emissions carbon dioxide histology biomarkers |
topic |
Usnea rubicunda volcanism hydrothermal emissions carbon dioxide histology biomarkers |
description |
We hypothesize that the thalli of the green-algal, CO2-sensitive lichen Usnea rubicunda (Stirton) undergo significant structural alterations as a biological response indicating increased CO2 emissions. To test that, U. rubicunda thalli were transplanted from a reference site with no volcanism into 36 sites distributed within the volcanically active Furnas caldera, encompassing the gradient of soil diffuse CO2 degassing areas (700 t d−1 of hydrothermal CO2). After 6 months of exposure in similar macroclimatic conditions, both Furnas transplants and samples kept at the reference site were retrieved for histology to assess thalli structure and the proportion between the symbionts. On average, cross-sections of Furnas thalli were significantly thicker than reference, owing mostly to the fungal layers of medulla and central cord. The latter occupied a significantly greater than reference relative volumetric density despite a smaller than reference relative percentage of algal occupation on Furnas thalli. These results reveal a positive and time-integrated response of U. rubicunda to the greater availability of CO2 from hydrothermal emissions in the volcanic environment, translated in greater efficiency of the algae in sustaining the fungal biomass. Histomorphometric structural alterations in the heteromerous thalli of U. rubicunda are suitable response biomarkers with potential to indicate a global rise of CO2 levels in natural environments. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-07 2020-07-01T00:00:00Z 2022-07-01T00:30:26Z |
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://hdl.handle.net/10451/45307 |
url |
http://hdl.handle.net/10451/45307 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
F.Bernardo; T.Rocha; C.Branquinho; P.Garcia; A.Rodrigues.2020Thallus structural alterations in green-algal lichens as indicators of elevated CO2 in a degassing volcanic area. https://doi.org/10.1016/j.ecolind.2020.106326 10.1016/j.ecolind.2020.106326 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799134522551304192 |