Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord

Autores
Jack Pan, B.; Vernet, Maria; Manck, Lauren; Forsch, Kiefer; Ekern, Lindsey; Mascioni, Martina; Barbeau, Katherine; Almandoz, Gaston Osvaldo; Orona, Alexander James
Año de publicación
2020
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The influence of glacial discharge on phytoplankton community composition remains an open question. The Antarctic Peninsula fjords offer an ideal system to understand the effect of ice-ocean forcing on phytoplankton community, providing an extreme in the spatial gradient from the glacio-marine boundary to the Western Antarctic Peninsula (WAP) continental shelf. In Andvord Bay, we found that glacial meltwater input altered surface salinity and was enriched in dissolved iron and nitrate, supporting phytoplankton biomass. The three major groups of phytoplankton fueled by glacial input were: cryptophytes, diatoms, and a group of unidentified small flagellates. In December, cryptophytes dominated the phytoplankton community and were correlated with relatively warmer temperatures in the surface layer; in addition, contrary to our hypothesis, no diatom bloom was observed in the fjord in spite of dissolved iron concentration >1 nM. By April, after the growth season, the overall phytoplankton abundance had decreased by an order of magnitude. Phytoplankton, in particular diatoms, were then limited by daytime length despite abundant macro-nutrient and iron concentrations. Mixed flagellates emerged as the dominant group during April due to the decline of other major taxa. Deep-learning algorithms for predicting the abundance of each major phytoplankton group captured the effects of these environmental factors on the phytoplankton community. Our results show that the fjord, under the influence of glacial meltwater, has relatively high phytoplankton biomass combined with high macro- and trace nutrient concentrations when compared to other WAP regions influenced by sea ice melting. Based on this study, we confirm that flagellates can be the dominant taxon in Antarctic fjords and we propose that iron concentration alone is insufficient to predict diatom growth. Furthermore, buoyant meltwater plumes can enrich the fjord with nitrate even if the main circulation is not driven by glacier meltwater discharge. As glacial meltwater continues to alter the phytoplankton taxonomic composition, it will have an important implication for higher trophic levels and add significant uncertainties to the prediction of regional ecosystem dynamics and biogeochemistry.
Fil: Jack Pan, B.. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Vernet, Maria. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Manck, Lauren. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Forsch, Kiefer. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Ekern, Lindsey. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Mascioni, Martina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Barbeau, Katherine. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Almandoz, Gaston Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina
Fil: Orona, Alexander James. Ocean Motion Technologies; Estados Unidos
Ocean Sciences Meeting 2020
Estados Unidos
Ocean Sciences Meeting
Materia
FJORD
ICE MELTING
PHYTOPLANKTON
PIGMENTS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/155056
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic FjordJack Pan, B.Vernet, MariaManck, LaurenForsch, KieferEkern, LindseyMascioni, MartinaBarbeau, KatherineAlmandoz, Gaston OsvaldoOrona, Alexander JamesFJORDICE MELTINGPHYTOPLANKTONPIGMENTShttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The influence of glacial discharge on phytoplankton community composition remains an open question. The Antarctic Peninsula fjords offer an ideal system to understand the effect of ice-ocean forcing on phytoplankton community, providing an extreme in the spatial gradient from the glacio-marine boundary to the Western Antarctic Peninsula (WAP) continental shelf. In Andvord Bay, we found that glacial meltwater input altered surface salinity and was enriched in dissolved iron and nitrate, supporting phytoplankton biomass. The three major groups of phytoplankton fueled by glacial input were: cryptophytes, diatoms, and a group of unidentified small flagellates. In December, cryptophytes dominated the phytoplankton community and were correlated with relatively warmer temperatures in the surface layer; in addition, contrary to our hypothesis, no diatom bloom was observed in the fjord in spite of dissolved iron concentration >1 nM. By April, after the growth season, the overall phytoplankton abundance had decreased by an order of magnitude. Phytoplankton, in particular diatoms, were then limited by daytime length despite abundant macro-nutrient and iron concentrations. Mixed flagellates emerged as the dominant group during April due to the decline of other major taxa. Deep-learning algorithms for predicting the abundance of each major phytoplankton group captured the effects of these environmental factors on the phytoplankton community. Our results show that the fjord, under the influence of glacial meltwater, has relatively high phytoplankton biomass combined with high macro- and trace nutrient concentrations when compared to other WAP regions influenced by sea ice melting. Based on this study, we confirm that flagellates can be the dominant taxon in Antarctic fjords and we propose that iron concentration alone is insufficient to predict diatom growth. Furthermore, buoyant meltwater plumes can enrich the fjord with nitrate even if the main circulation is not driven by glacier meltwater discharge. As glacial meltwater continues to alter the phytoplankton taxonomic composition, it will have an important implication for higher trophic levels and add significant uncertainties to the prediction of regional ecosystem dynamics and biogeochemistry.Fil: Jack Pan, B.. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Vernet, Maria. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Manck, Lauren. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Forsch, Kiefer. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Ekern, Lindsey. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Mascioni, Martina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Barbeau, Katherine. University of California at San Diego. Scripps Institution of Oceanography; Estados UnidosFil: Almandoz, Gaston Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; ArgentinaFil: Orona, Alexander James. Ocean Motion Technologies; Estados UnidosOcean Sciences Meeting 2020Estados UnidosOcean Sciences MeetingAmerican Geophysical Union2020info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/155056Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord; Ocean Sciences Meeting 2020; Estados Unidos; 2020; 1-3CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://agu.confex.com/agu/osm20/meetingapp.cgi/Paper/653344info:eu-repo/semantics/altIdentifier/url/https://agu.confex.com/agu/osm20/meetingapp.cgi/Paper/653344Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:21:30Zoai:ri.conicet.gov.ar:11336/155056instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:21:31.252CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
title Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
spellingShingle Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
Jack Pan, B.
FJORD
ICE MELTING
PHYTOPLANKTON
PIGMENTS
title_short Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
title_full Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
title_fullStr Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
title_full_unstemmed Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
title_sort Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
dc.creator.none.fl_str_mv Jack Pan, B.
Vernet, Maria
Manck, Lauren
Forsch, Kiefer
Ekern, Lindsey
Mascioni, Martina
Barbeau, Katherine
Almandoz, Gaston Osvaldo
Orona, Alexander James
author Jack Pan, B.
author_facet Jack Pan, B.
Vernet, Maria
Manck, Lauren
Forsch, Kiefer
Ekern, Lindsey
Mascioni, Martina
Barbeau, Katherine
Almandoz, Gaston Osvaldo
Orona, Alexander James
author_role author
author2 Vernet, Maria
Manck, Lauren
Forsch, Kiefer
Ekern, Lindsey
Mascioni, Martina
Barbeau, Katherine
Almandoz, Gaston Osvaldo
Orona, Alexander James
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv FJORD
ICE MELTING
PHYTOPLANKTON
PIGMENTS
topic FJORD
ICE MELTING
PHYTOPLANKTON
PIGMENTS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The influence of glacial discharge on phytoplankton community composition remains an open question. The Antarctic Peninsula fjords offer an ideal system to understand the effect of ice-ocean forcing on phytoplankton community, providing an extreme in the spatial gradient from the glacio-marine boundary to the Western Antarctic Peninsula (WAP) continental shelf. In Andvord Bay, we found that glacial meltwater input altered surface salinity and was enriched in dissolved iron and nitrate, supporting phytoplankton biomass. The three major groups of phytoplankton fueled by glacial input were: cryptophytes, diatoms, and a group of unidentified small flagellates. In December, cryptophytes dominated the phytoplankton community and were correlated with relatively warmer temperatures in the surface layer; in addition, contrary to our hypothesis, no diatom bloom was observed in the fjord in spite of dissolved iron concentration >1 nM. By April, after the growth season, the overall phytoplankton abundance had decreased by an order of magnitude. Phytoplankton, in particular diatoms, were then limited by daytime length despite abundant macro-nutrient and iron concentrations. Mixed flagellates emerged as the dominant group during April due to the decline of other major taxa. Deep-learning algorithms for predicting the abundance of each major phytoplankton group captured the effects of these environmental factors on the phytoplankton community. Our results show that the fjord, under the influence of glacial meltwater, has relatively high phytoplankton biomass combined with high macro- and trace nutrient concentrations when compared to other WAP regions influenced by sea ice melting. Based on this study, we confirm that flagellates can be the dominant taxon in Antarctic fjords and we propose that iron concentration alone is insufficient to predict diatom growth. Furthermore, buoyant meltwater plumes can enrich the fjord with nitrate even if the main circulation is not driven by glacier meltwater discharge. As glacial meltwater continues to alter the phytoplankton taxonomic composition, it will have an important implication for higher trophic levels and add significant uncertainties to the prediction of regional ecosystem dynamics and biogeochemistry.
Fil: Jack Pan, B.. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Vernet, Maria. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Manck, Lauren. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Forsch, Kiefer. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Ekern, Lindsey. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Mascioni, Martina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Barbeau, Katherine. University of California at San Diego. Scripps Institution of Oceanography; Estados Unidos
Fil: Almandoz, Gaston Osvaldo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Ficología; Argentina
Fil: Orona, Alexander James. Ocean Motion Technologies; Estados Unidos
Ocean Sciences Meeting 2020
Estados Unidos
Ocean Sciences Meeting
description The influence of glacial discharge on phytoplankton community composition remains an open question. The Antarctic Peninsula fjords offer an ideal system to understand the effect of ice-ocean forcing on phytoplankton community, providing an extreme in the spatial gradient from the glacio-marine boundary to the Western Antarctic Peninsula (WAP) continental shelf. In Andvord Bay, we found that glacial meltwater input altered surface salinity and was enriched in dissolved iron and nitrate, supporting phytoplankton biomass. The three major groups of phytoplankton fueled by glacial input were: cryptophytes, diatoms, and a group of unidentified small flagellates. In December, cryptophytes dominated the phytoplankton community and were correlated with relatively warmer temperatures in the surface layer; in addition, contrary to our hypothesis, no diatom bloom was observed in the fjord in spite of dissolved iron concentration >1 nM. By April, after the growth season, the overall phytoplankton abundance had decreased by an order of magnitude. Phytoplankton, in particular diatoms, were then limited by daytime length despite abundant macro-nutrient and iron concentrations. Mixed flagellates emerged as the dominant group during April due to the decline of other major taxa. Deep-learning algorithms for predicting the abundance of each major phytoplankton group captured the effects of these environmental factors on the phytoplankton community. Our results show that the fjord, under the influence of glacial meltwater, has relatively high phytoplankton biomass combined with high macro- and trace nutrient concentrations when compared to other WAP regions influenced by sea ice melting. Based on this study, we confirm that flagellates can be the dominant taxon in Antarctic fjords and we propose that iron concentration alone is insufficient to predict diatom growth. Furthermore, buoyant meltwater plumes can enrich the fjord with nitrate even if the main circulation is not driven by glacier meltwater discharge. As glacial meltwater continues to alter the phytoplankton taxonomic composition, it will have an important implication for higher trophic levels and add significant uncertainties to the prediction of regional ecosystem dynamics and biogeochemistry.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
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Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/155056
Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord; Ocean Sciences Meeting 2020; Estados Unidos; 2020; 1-3
CONICET Digital
CONICET
url http://hdl.handle.net/11336/155056
identifier_str_mv Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord; Ocean Sciences Meeting 2020; Estados Unidos; 2020; 1-3
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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