Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes
Abstract: Antarctic notothenioid fishes have evolved in the Southern Ocean for 10-14 MY under an unusual set of circumstances. Their characteristics include the complete absence of the circulating oxygen-binding protein, hemoglobin (Hb) within the Channichthyid (Icefish) family of notothenioids. Mor...
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dataone:http://get.iedadata.org/metadata/iso/600084 2024-06-03T18:46:24+00:00 Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes O'Brien, Kristin ENVELOPE(-64.45,-62.44,-63.29,-64.1) BEGINDATE: 2008-09-01T00:00:00Z ENDDATE: 2013-08-31T00:00:00Z 2013-01-01T00:00:00Z http://get.iedadata.org/metadata/iso/600084 unknown IEDA: US Antarctic Program Data Center Pot Trawl Antarctic Organisms and Ecosystems Biology Southern Ocean Biosphere Cryosphere Oceans US Antarctic Program Data Center (USAP-DC) Dataset 2013 dataone:urn:node:IEDA_USAP 2024-06-03T18:11:58Z Abstract: Antarctic notothenioid fishes have evolved in the Southern Ocean for 10-14 MY under an unusual set of circumstances. Their characteristics include the complete absence of the circulating oxygen-binding protein, hemoglobin (Hb) within the Channichthyid (Icefish) family of notothenioids. Moreover, some species within the 16 members of this family have also lost the ability to express the oxygen-binding and storage protein, myoglobin (Mb) in cardiac muscle. Our previous work has determined that the loss of Hb and/or Mb is correlated with significant increases in densities of mitochondria within oxidative tissues, and extensive remodeling of these vital organelles. To date, nothing is known about how modifications in mitochondrial architecture of icefishes affect organelle function, or more importantly, how they affect organismal-level physiology. Most critical for Antarctic fishes is that mitochondrial characteristics have been linked to how well ectotherms can withstand increases in temperature. This collaborative research project will address the hypothesis that the unusual mitochondrial architecture of Antarctic Channichthyids has led to changes in function that impact their ability to withstand elevations in temperature. Specifically, the research will (1) determine if the unusual mitochondrial architecture of icefishes affects function and contributes to organismal thermal sensitivity, (2) identify differences in organismal thermal tolerance between red- and white- blooded notothenioids, (3) identify molecular mechanisms regulating changes in mitochondrial structure in icefishes. The results may establish channichthyid icefishes as a sentinel taxon for signaling the impact of global warming on the Southern Ocean. Broad impacts of this project will be realized by participation of high school biology teachers in field work through cooperation with the ARMADA project at the University of Rhode Island, as well as graduate education. Dataset Antarc* Antarctic Icefish Southern Ocean IEDA: US Antarctic Program Data Center (via DataONE) Antarctic Southern Ocean ENVELOPE(-64.45,-62.44,-63.29,-64.1) |
institution |
Open Polar |
collection |
IEDA: US Antarctic Program Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:IEDA_USAP |
language |
unknown |
topic |
Pot Trawl Antarctic Organisms and Ecosystems Biology Southern Ocean Biosphere Cryosphere Oceans US Antarctic Program Data Center (USAP-DC) |
spellingShingle |
Pot Trawl Antarctic Organisms and Ecosystems Biology Southern Ocean Biosphere Cryosphere Oceans US Antarctic Program Data Center (USAP-DC) O'Brien, Kristin Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
topic_facet |
Pot Trawl Antarctic Organisms and Ecosystems Biology Southern Ocean Biosphere Cryosphere Oceans US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: Antarctic notothenioid fishes have evolved in the Southern Ocean for 10-14 MY under an unusual set of circumstances. Their characteristics include the complete absence of the circulating oxygen-binding protein, hemoglobin (Hb) within the Channichthyid (Icefish) family of notothenioids. Moreover, some species within the 16 members of this family have also lost the ability to express the oxygen-binding and storage protein, myoglobin (Mb) in cardiac muscle. Our previous work has determined that the loss of Hb and/or Mb is correlated with significant increases in densities of mitochondria within oxidative tissues, and extensive remodeling of these vital organelles. To date, nothing is known about how modifications in mitochondrial architecture of icefishes affect organelle function, or more importantly, how they affect organismal-level physiology. Most critical for Antarctic fishes is that mitochondrial characteristics have been linked to how well ectotherms can withstand increases in temperature. This collaborative research project will address the hypothesis that the unusual mitochondrial architecture of Antarctic Channichthyids has led to changes in function that impact their ability to withstand elevations in temperature. Specifically, the research will (1) determine if the unusual mitochondrial architecture of icefishes affects function and contributes to organismal thermal sensitivity, (2) identify differences in organismal thermal tolerance between red- and white- blooded notothenioids, (3) identify molecular mechanisms regulating changes in mitochondrial structure in icefishes. The results may establish channichthyid icefishes as a sentinel taxon for signaling the impact of global warming on the Southern Ocean. Broad impacts of this project will be realized by participation of high school biology teachers in field work through cooperation with the ARMADA project at the University of Rhode Island, as well as graduate education. |
format |
Dataset |
author |
O'Brien, Kristin |
author_facet |
O'Brien, Kristin |
author_sort |
O'Brien, Kristin |
title |
Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
title_short |
Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
title_full |
Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
title_fullStr |
Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
title_full_unstemmed |
Linkages among Mitochondrial Form, Function and Thermal Tolerance of Antarctic Notothenioid Fishes |
title_sort |
linkages among mitochondrial form, function and thermal tolerance of antarctic notothenioid fishes |
publisher |
IEDA: US Antarctic Program Data Center |
publishDate |
2013 |
url |
http://get.iedadata.org/metadata/iso/600084 |
op_coverage |
ENVELOPE(-64.45,-62.44,-63.29,-64.1) BEGINDATE: 2008-09-01T00:00:00Z ENDDATE: 2013-08-31T00:00:00Z |
long_lat |
ENVELOPE(-64.45,-62.44,-63.29,-64.1) |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Icefish Southern Ocean |
genre_facet |
Antarc* Antarctic Icefish Southern Ocean |
_version_ |
1800873020022063104 |