Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity

Autores
Antoni, Julieta S.; Almandoz, Gastón Osvaldo; Ferrario, Martha E.; Hernando, Marcelo Pablo; Varela, Diana E.; Rozema, Patrick D.; Buma, Anita G. J.; Paparazzo, Flavio E.; Schloss, Irene R.
Año de publicación
2020
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The climate around the Western Antarctic Peninsula (WAP) is rapidly changing and dramatically affecting marine coastal waters. Increases in air and seawater temperatures, not matter how small, can alter coastal biological communities due to both temperature increases as well as salinity reduction from glacier melting. The aim of this study was to evaluate the individual and combined effects of elevated sea surface temperature (+4 °C) and decreased salinity (−4) on growth and assemblage composition of natural summer phytoplankton from Potter Cove (King George Island, South Shetlands, northern WAP), using an outdoor microcosm experi-ment. Pigment composition was analyzed by high performance liquid chromatography (HPLC/Chemtax) and species composition by light and electron microscopy. Increases in phytoplankton biomass during the first 3 days at elevated-temperatures coincided with an increase in the abundance and the specific growth rate of small centric diatoms (Chaetoceros socialis and Shionodiscus gaarderae, mostly observed in temperate waters) and unidentified small phytoflagellates < 5 μm. In contrast, pennate diatoms significantly decreased. At the end of the experiment on day 7, under nitrate and phosphate limitation, chlorophytes abundances increased under low salinity whereas prasinophytes decreased in all treatments. This study suggests that climate change could notably affect Antarctic phytoplankton composition by favouring temperate-water species previously undetected in Antarctic waters, such us S. gaarderae. Moreover, the observed changes in phytoplankton structure, associated with an increase of nano- over micro-size taxa, could have important implications for future Antarctic food webs.
Facultad de Ciencias Naturales y Museo
Materia
Biología
Climate change
Antarctic phytoplankton assemblages
Chaetoceros socialis
Shionodiscus gaarderae
Chlorophytes
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/137596
Acceder
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repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinityAntoni, Julieta S.Almandoz, Gastón OsvaldoFerrario, Martha E.Hernando, Marcelo PabloVarela, Diana E.Rozema, Patrick D.Buma, Anita G. J.Paparazzo, Flavio E.Schloss, Irene R.BiologíaClimate changeAntarctic phytoplankton assemblagesChaetoceros socialisShionodiscus gaarderaeChlorophytesThe climate around the Western Antarctic Peninsula (WAP) is rapidly changing and dramatically affecting marine coastal waters. Increases in air and seawater temperatures, not matter how small, can alter coastal biological communities due to both temperature increases as well as salinity reduction from glacier melting. The aim of this study was to evaluate the individual and combined effects of elevated sea surface temperature (+4 °C) and decreased salinity (−4) on growth and assemblage composition of natural summer phytoplankton from Potter Cove (King George Island, South Shetlands, northern WAP), using an outdoor microcosm experi-ment. Pigment composition was analyzed by high performance liquid chromatography (HPLC/Chemtax) and species composition by light and electron microscopy. Increases in phytoplankton biomass during the first 3 days at elevated-temperatures coincided with an increase in the abundance and the specific growth rate of small centric diatoms (Chaetoceros socialis and Shionodiscus gaarderae, mostly observed in temperate waters) and unidentified small phytoflagellates &lt; 5 μm. In contrast, pennate diatoms significantly decreased. At the end of the experiment on day 7, under nitrate and phosphate limitation, chlorophytes abundances increased under low salinity whereas prasinophytes decreased in all treatments. This study suggests that climate change could notably affect Antarctic phytoplankton composition by favouring temperate-water species previously undetected in Antarctic waters, such us S. gaarderae. Moreover, the observed changes in phytoplankton structure, associated with an increase of nano- over micro-size taxa, could have important implications for future Antarctic food webs.Facultad de Ciencias Naturales y Museo2020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/137596enginfo:eu-repo/semantics/altIdentifier/issn/0022-0981info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2020.151444info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:31:03Zoai:sedici.unlp.edu.ar:10915/137596Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:31:03.949SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
title Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
spellingShingle Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
Antoni, Julieta S.
Biología
Climate change
Antarctic phytoplankton assemblages
Chaetoceros socialis
Shionodiscus gaarderae
Chlorophytes
title_short Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
title_full Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
title_fullStr Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
title_full_unstemmed Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
title_sort Response of a natural Antarctic phytoplankton assemblage to changes in temperature and salinity
dc.creator.none.fl_str_mv Antoni, Julieta S.
Almandoz, Gastón Osvaldo
Ferrario, Martha E.
Hernando, Marcelo Pablo
Varela, Diana E.
Rozema, Patrick D.
Buma, Anita G. J.
Paparazzo, Flavio E.
Schloss, Irene R.
author Antoni, Julieta S.
author_facet Antoni, Julieta S.
Almandoz, Gastón Osvaldo
Ferrario, Martha E.
Hernando, Marcelo Pablo
Varela, Diana E.
Rozema, Patrick D.
Buma, Anita G. J.
Paparazzo, Flavio E.
Schloss, Irene R.
author_role author
author2 Almandoz, Gastón Osvaldo
Ferrario, Martha E.
Hernando, Marcelo Pablo
Varela, Diana E.
Rozema, Patrick D.
Buma, Anita G. J.
Paparazzo, Flavio E.
Schloss, Irene R.
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Biología
Climate change
Antarctic phytoplankton assemblages
Chaetoceros socialis
Shionodiscus gaarderae
Chlorophytes
topic Biología
Climate change
Antarctic phytoplankton assemblages
Chaetoceros socialis
Shionodiscus gaarderae
Chlorophytes
dc.description.none.fl_txt_mv The climate around the Western Antarctic Peninsula (WAP) is rapidly changing and dramatically affecting marine coastal waters. Increases in air and seawater temperatures, not matter how small, can alter coastal biological communities due to both temperature increases as well as salinity reduction from glacier melting. The aim of this study was to evaluate the individual and combined effects of elevated sea surface temperature (+4 °C) and decreased salinity (−4) on growth and assemblage composition of natural summer phytoplankton from Potter Cove (King George Island, South Shetlands, northern WAP), using an outdoor microcosm experi-ment. Pigment composition was analyzed by high performance liquid chromatography (HPLC/Chemtax) and species composition by light and electron microscopy. Increases in phytoplankton biomass during the first 3 days at elevated-temperatures coincided with an increase in the abundance and the specific growth rate of small centric diatoms (Chaetoceros socialis and Shionodiscus gaarderae, mostly observed in temperate waters) and unidentified small phytoflagellates &lt; 5 μm. In contrast, pennate diatoms significantly decreased. At the end of the experiment on day 7, under nitrate and phosphate limitation, chlorophytes abundances increased under low salinity whereas prasinophytes decreased in all treatments. This study suggests that climate change could notably affect Antarctic phytoplankton composition by favouring temperate-water species previously undetected in Antarctic waters, such us S. gaarderae. Moreover, the observed changes in phytoplankton structure, associated with an increase of nano- over micro-size taxa, could have important implications for future Antarctic food webs.
Facultad de Ciencias Naturales y Museo
description The climate around the Western Antarctic Peninsula (WAP) is rapidly changing and dramatically affecting marine coastal waters. Increases in air and seawater temperatures, not matter how small, can alter coastal biological communities due to both temperature increases as well as salinity reduction from glacier melting. The aim of this study was to evaluate the individual and combined effects of elevated sea surface temperature (+4 °C) and decreased salinity (−4) on growth and assemblage composition of natural summer phytoplankton from Potter Cove (King George Island, South Shetlands, northern WAP), using an outdoor microcosm experi-ment. Pigment composition was analyzed by high performance liquid chromatography (HPLC/Chemtax) and species composition by light and electron microscopy. Increases in phytoplankton biomass during the first 3 days at elevated-temperatures coincided with an increase in the abundance and the specific growth rate of small centric diatoms (Chaetoceros socialis and Shionodiscus gaarderae, mostly observed in temperate waters) and unidentified small phytoflagellates &lt; 5 μm. In contrast, pennate diatoms significantly decreased. At the end of the experiment on day 7, under nitrate and phosphate limitation, chlorophytes abundances increased under low salinity whereas prasinophytes decreased in all treatments. This study suggests that climate change could notably affect Antarctic phytoplankton composition by favouring temperate-water species previously undetected in Antarctic waters, such us S. gaarderae. Moreover, the observed changes in phytoplankton structure, associated with an increase of nano- over micro-size taxa, could have important implications for future Antarctic food webs.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/137596
url http://sedici.unlp.edu.ar/handle/10915/137596
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0022-0981
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2020.151444
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
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institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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