Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2013 Intact polar diacylglycerolipids (IP-DAGs) were used to study microbial dynamics in the surface ocean. I...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/5663 2023-05-15T17:32:36+02:00 Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production Popendorf, Kimberly J. Sargasso Sea North Pacific North Atlantic Mediterranean Sea 2013-02 application/pdf https://hdl.handle.net/1912/5663 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/5663 doi:10.1575/1912/5663 doi:10.1575/1912/5663 Microbial ecology Microbiological chemistry Atlantic Exploer (Ship) Cruise BV39 Oceanus (Ship : 1975-) Cruise OC443 L'Atalante (Ship) BOUM Cruise Kilo Moana (Ship) Cruise KM1013 Thesis 2013 ftwhoas https://doi.org/10.1575/1912/5663 2022-05-28T22:58:45Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2013 Intact polar diacylglycerolipids (IP-DAGs) were used to study microbial dynamics in the surface ocean. IP-DAGs from surface ocean seawater were quantified using high performance liquid chromatography-mass spectrometry (HPLC-MS), after first developing a sensitive, high throughput molecular ion independent triple quadrupole MS method for quantification. Using this analytical technique I examined the distribution of the nine most abundant classes of IPDAGs across the Mediterranean, and found that phospholipids as a percent of total IP-DAGs correlated with phosphate concentration. Furthermore, phospholipids were a higher percent of total particulate phosphorus where phosphate was higher, ranging from 1-14%. Thus IP-DAGs can play not only a significant but also a dynamic role in defining planktonic nutrient needs and cellular C:N:P ratios in the environment. Additionally, microcosm incubations were amended with phosphate and ammonium, and in the course of several days this elicited a shift in the ratios of IP-DAGs. This study was the first to demonstrate the dynamic response of membrane lipid composition to changes in nutrients in a natural, mixed planktonic community, and indicated that the change in IP-DAG ratios in response to changing nutrients may be a useful indicator of microbial nutrient stress. In the surface waters of the western North Atlantic I used three experimental approaches to identify the microbial sources of the nine most abundant classes of IP-DAGs. Phytoplankton are the primary source of one class of sulfolipid, sulfoquinovosyldiacylglycerol, and one class of betaine lipid, diacylglyceryl-trimethyl-homoserine, while heterotrophic bacteria are the dominant source of the phospholipids phosphatidylglycerol and phosphatidylethanolamine. In regrowth experiments in the Sargasso Sea and the North Pacific I ... Thesis North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Pacific Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Microbial ecology Microbiological chemistry Atlantic Exploer (Ship) Cruise BV39 Oceanus (Ship : 1975-) Cruise OC443 L'Atalante (Ship) BOUM Cruise Kilo Moana (Ship) Cruise KM1013 |
spellingShingle |
Microbial ecology Microbiological chemistry Atlantic Exploer (Ship) Cruise BV39 Oceanus (Ship : 1975-) Cruise OC443 L'Atalante (Ship) BOUM Cruise Kilo Moana (Ship) Cruise KM1013 Popendorf, Kimberly J. Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
topic_facet |
Microbial ecology Microbiological chemistry Atlantic Exploer (Ship) Cruise BV39 Oceanus (Ship : 1975-) Cruise OC443 L'Atalante (Ship) BOUM Cruise Kilo Moana (Ship) Cruise KM1013 |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2013 Intact polar diacylglycerolipids (IP-DAGs) were used to study microbial dynamics in the surface ocean. IP-DAGs from surface ocean seawater were quantified using high performance liquid chromatography-mass spectrometry (HPLC-MS), after first developing a sensitive, high throughput molecular ion independent triple quadrupole MS method for quantification. Using this analytical technique I examined the distribution of the nine most abundant classes of IPDAGs across the Mediterranean, and found that phospholipids as a percent of total IP-DAGs correlated with phosphate concentration. Furthermore, phospholipids were a higher percent of total particulate phosphorus where phosphate was higher, ranging from 1-14%. Thus IP-DAGs can play not only a significant but also a dynamic role in defining planktonic nutrient needs and cellular C:N:P ratios in the environment. Additionally, microcosm incubations were amended with phosphate and ammonium, and in the course of several days this elicited a shift in the ratios of IP-DAGs. This study was the first to demonstrate the dynamic response of membrane lipid composition to changes in nutrients in a natural, mixed planktonic community, and indicated that the change in IP-DAG ratios in response to changing nutrients may be a useful indicator of microbial nutrient stress. In the surface waters of the western North Atlantic I used three experimental approaches to identify the microbial sources of the nine most abundant classes of IP-DAGs. Phytoplankton are the primary source of one class of sulfolipid, sulfoquinovosyldiacylglycerol, and one class of betaine lipid, diacylglyceryl-trimethyl-homoserine, while heterotrophic bacteria are the dominant source of the phospholipids phosphatidylglycerol and phosphatidylethanolamine. In regrowth experiments in the Sargasso Sea and the North Pacific I ... |
format |
Thesis |
author |
Popendorf, Kimberly J. |
author_facet |
Popendorf, Kimberly J. |
author_sort |
Popendorf, Kimberly J. |
title |
Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
title_short |
Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
title_full |
Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
title_fullStr |
Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
title_full_unstemmed |
Marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
title_sort |
marine microbial intact polar diacylglycerolipids and their application in the study of nutrient stress and bacterial production |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/5663 |
op_coverage |
Sargasso Sea North Pacific North Atlantic Mediterranean Sea |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
doi:10.1575/1912/5663 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/5663 doi:10.1575/1912/5663 |
op_doi |
https://doi.org/10.1575/1912/5663 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766130804775190528 |