Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord
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 bound...
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ftconicet:oai:ri.conicet.gov.ar:11336/155056 2023-10-09T21:47:15+02:00 Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord Jack Pan, B. Vernet, Maria Manck, Lauren Forsch, Kiefer Ekern, Lindsey Mascioni, Martina Barbeau, Katherine Almandoz, Gaston Osvaldo Orona, Alexander James Internacional application/pdf http://hdl.handle.net/11336/155056 eng eng American Geophysical Union info:eu-repo/semantics/altIdentifier/url/https://agu.confex.com/agu/osm20/meetingapp.cgi/Paper/653344 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 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ FJORD ICE MELTING PHYTOPLANKTON PIGMENTS https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject info:ar-repo/semantics/documento de conferencia Congreso Book ftconicet 2023-09-24T20:13:03Z 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 ... Book Antarc* Antarctic Antarctic Peninsula Sea ice CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Andvord ENVELOPE(-62.616,-62.616,-64.833,-64.833) Andvord Bay ENVELOPE(-62.650,-62.650,-64.833,-64.833) Antarctic Antarctic Peninsula The Antarctic |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
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FJORD ICE MELTING PHYTOPLANKTON PIGMENTS https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
FJORD ICE MELTING PHYTOPLANKTON PIGMENTS https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Jack Pan, B. Vernet, Maria Manck, Lauren Forsch, Kiefer Ekern, Lindsey Mascioni, Martina Barbeau, Katherine Almandoz, Gaston Osvaldo Orona, Alexander James Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord |
topic_facet |
FJORD ICE MELTING PHYTOPLANKTON PIGMENTS https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
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 ... |
format |
Book |
author |
Jack Pan, B. Vernet, Maria Manck, Lauren Forsch, Kiefer Ekern, Lindsey Mascioni, Martina Barbeau, Katherine Almandoz, Gaston Osvaldo Orona, Alexander James |
author_facet |
Jack Pan, B. Vernet, Maria Manck, Lauren Forsch, Kiefer Ekern, Lindsey Mascioni, Martina Barbeau, Katherine Almandoz, Gaston Osvaldo Orona, Alexander James |
author_sort |
Jack Pan, B. |
title |
Glacial Discharge and its Impact on Phytoplankton Taxonomic Composition in an Antarctic Fjord |
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 |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/11336/155056 |
op_coverage |
Internacional |
long_lat |
ENVELOPE(-62.616,-62.616,-64.833,-64.833) ENVELOPE(-62.650,-62.650,-64.833,-64.833) |
geographic |
Andvord Andvord Bay Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Andvord Andvord Bay Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://agu.confex.com/agu/osm20/meetingapp.cgi/Paper/653344 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 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
_version_ |
1779310245036687360 |