Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya
Bacteria play a significant role in elemental cycling in the ocean. The Amundsen Sea Polynya International Research Expedition (ASPIRE) sought to better understand how heterotrophic bacteria respond to intense austral summer blooms, dominated by the haptophyte Phaeocystis antarctica. Bacterial produ...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
uga
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/10724/30727 http://purl.galileo.usg.edu/uga_etd/williams_colin_m_201405_ms |
id |
ftunivgeorgia:oai:athenaeum.libs.uga.edu:10724/30727 |
---|---|
record_format |
openpolar |
spelling |
ftunivgeorgia:oai:athenaeum.libs.uga.edu:10724/30727 2023-05-15T13:23:35+02:00 Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya Williams, Colin Malcolm 2014-05 http://hdl.handle.net/10724/30727 http://purl.galileo.usg.edu/uga_etd/williams_colin_m_201405_ms eng eng uga williams_colin_m_201405_ms http://purl.galileo.usg.edu/uga_etd/williams_colin_m_201405_ms http://hdl.handle.net/10724/30727 public Heterotrophic Bacteria Productivity Antarctica Amundsen Sea Polynya Organic Matter Marine Science Thesis 2014 ftunivgeorgia 2020-09-24T10:05:30Z Bacteria play a significant role in elemental cycling in the ocean. The Amundsen Sea Polynya International Research Expedition (ASPIRE) sought to better understand how heterotrophic bacteria respond to intense austral summer blooms, dominated by the haptophyte Phaeocystis antarctica. Bacterial production (BP) rates were measured using 3H-leucine incorporation and bacterial respiration (BR) was estimated with carbon dioxide changes in dark-bottle 48-hr incubations. When combined, BP and BR yield average bacterial growth efficiencies (9.6% ± 0.6 with a range from 5 to > 20%, depending on assumptions and conversion factors). One explanation for low BGE is low macro- and micro-zooplankton abundances in the upper 100 m compared to oligotrophic systems, resulting in reduced DOM flux to the bacteria from minimal grazing of organic rich P. antarctica. Bacterial production correlates with particulate organic matter concentration (R2=0.76), and size fractionation experiments show 70% of BP is particle-associated. Exoenzyme hydrolysis also correlates with high POM concentrations, suggesting strong particle-association of bacterial activity in the Amundsen Sea Polynya. MS Marine Sciences Marine Sciences Patricia L. Yager Patricia L. Yager Mary Ann Moran Marc E. Frischer Thesis Amundsen Sea Antarc* Antarctica University of Georgia: Athenaeum@UGA Amundsen Sea Austral |
institution |
Open Polar |
collection |
University of Georgia: Athenaeum@UGA |
op_collection_id |
ftunivgeorgia |
language |
English |
topic |
Heterotrophic Bacteria Productivity Antarctica Amundsen Sea Polynya Organic Matter Marine Science |
spellingShingle |
Heterotrophic Bacteria Productivity Antarctica Amundsen Sea Polynya Organic Matter Marine Science Williams, Colin Malcolm Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya |
topic_facet |
Heterotrophic Bacteria Productivity Antarctica Amundsen Sea Polynya Organic Matter Marine Science |
description |
Bacteria play a significant role in elemental cycling in the ocean. The Amundsen Sea Polynya International Research Expedition (ASPIRE) sought to better understand how heterotrophic bacteria respond to intense austral summer blooms, dominated by the haptophyte Phaeocystis antarctica. Bacterial production (BP) rates were measured using 3H-leucine incorporation and bacterial respiration (BR) was estimated with carbon dioxide changes in dark-bottle 48-hr incubations. When combined, BP and BR yield average bacterial growth efficiencies (9.6% ± 0.6 with a range from 5 to > 20%, depending on assumptions and conversion factors). One explanation for low BGE is low macro- and micro-zooplankton abundances in the upper 100 m compared to oligotrophic systems, resulting in reduced DOM flux to the bacteria from minimal grazing of organic rich P. antarctica. Bacterial production correlates with particulate organic matter concentration (R2=0.76), and size fractionation experiments show 70% of BP is particle-associated. Exoenzyme hydrolysis also correlates with high POM concentrations, suggesting strong particle-association of bacterial activity in the Amundsen Sea Polynya. MS Marine Sciences Marine Sciences Patricia L. Yager Patricia L. Yager Mary Ann Moran Marc E. Frischer |
format |
Thesis |
author |
Williams, Colin Malcolm |
author_facet |
Williams, Colin Malcolm |
author_sort |
Williams, Colin Malcolm |
title |
Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya |
title_short |
Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya |
title_full |
Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya |
title_fullStr |
Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya |
title_full_unstemmed |
Pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte Phaeocystis antarctica in the Amundsen Sea Polynya |
title_sort |
pelagic microbial heterotrophy in response to a highly productive bloom of the marine haptophyte phaeocystis antarctica in the amundsen sea polynya |
publisher |
uga |
publishDate |
2014 |
url |
http://hdl.handle.net/10724/30727 http://purl.galileo.usg.edu/uga_etd/williams_colin_m_201405_ms |
geographic |
Amundsen Sea Austral |
geographic_facet |
Amundsen Sea Austral |
genre |
Amundsen Sea Antarc* Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica |
op_relation |
williams_colin_m_201405_ms http://purl.galileo.usg.edu/uga_etd/williams_colin_m_201405_ms http://hdl.handle.net/10724/30727 |
op_rights |
public |
_version_ |
1766373292780814336 |