Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki
The effects of hypoxic exposure on whole-blood oxygen-affinity were examined in the antarctic fish Pagothenia borchgrevinki . Fish exposed to P O O2 = 60 mmHg for 11-14 days at -1.5°C had a P 50 value of 20.6±4.8mmHg (S.D., N =13) at pH8.16, compared with 31.1 ±4.3mmHg (N=10) at pH8.00 for normoxic...
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fthighwire:oai:open-archive.highwire.org:jexbio:141/1/97 2023-05-15T13:36:55+02:00 Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki WELLS, R. M.G. GRIGG, G. C. BEARD, L. A. SUMMERS, G. 1989-01-01 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/141/1/97 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/141/1/97 Copyright (C) 1989, Company of Biologists Journal Articles TEXT 1989 fthighwire 2013-05-28T02:14:00Z The effects of hypoxic exposure on whole-blood oxygen-affinity were examined in the antarctic fish Pagothenia borchgrevinki . Fish exposed to P O O2 = 60 mmHg for 11-14 days at -1.5°C had a P 50 value of 20.6±4.8mmHg (S.D., N =13) at pH8.16, compared with 31.1 ±4.3mmHg (N=10) at pH8.00 for normoxic fish. Exposure to low oxygen levels resulted in a significant (66 %) rise in haemoglobin concentration, and erythrocyte [ATP] decreased by approximately 27%. There was no evidence for erythrocyte swelling. An aberrant gill morphology was observed in six fish and these showed unexpectedly high erythrocyte ATP levels. Oxygen-carrying capacity increased by approximately 40% in hypoxic fish and was correlated with a 34 % decrease in spleen mass. Despite the fact that antarctic fish have exceptionally low demands for oxygen and are unlikely ever to encounterenvironmental hypoxia, this antarctic fish has the necessary machinery to respondto hypoxia in a way that is typical of teleosts that naturally inhabit oxylabile environments. The ability to make short-term adaptive changes in the O 2 delivery system in response to hypoxic exposure may be typical for vertebrates in general, rather than a feature seen only in those organisms which encounter environmental hypoxia on a regular basis. Text Antarc* Antarctic HighWire Press (Stanford University) Antarctic The Antarctic |
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Journal Articles |
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Journal Articles WELLS, R. M.G. GRIGG, G. C. BEARD, L. A. SUMMERS, G. Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki |
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Journal Articles |
description |
The effects of hypoxic exposure on whole-blood oxygen-affinity were examined in the antarctic fish Pagothenia borchgrevinki . Fish exposed to P O O2 = 60 mmHg for 11-14 days at -1.5°C had a P 50 value of 20.6±4.8mmHg (S.D., N =13) at pH8.16, compared with 31.1 ±4.3mmHg (N=10) at pH8.00 for normoxic fish. Exposure to low oxygen levels resulted in a significant (66 %) rise in haemoglobin concentration, and erythrocyte [ATP] decreased by approximately 27%. There was no evidence for erythrocyte swelling. An aberrant gill morphology was observed in six fish and these showed unexpectedly high erythrocyte ATP levels. Oxygen-carrying capacity increased by approximately 40% in hypoxic fish and was correlated with a 34 % decrease in spleen mass. Despite the fact that antarctic fish have exceptionally low demands for oxygen and are unlikely ever to encounterenvironmental hypoxia, this antarctic fish has the necessary machinery to respondto hypoxia in a way that is typical of teleosts that naturally inhabit oxylabile environments. The ability to make short-term adaptive changes in the O 2 delivery system in response to hypoxic exposure may be typical for vertebrates in general, rather than a feature seen only in those organisms which encounter environmental hypoxia on a regular basis. |
format |
Text |
author |
WELLS, R. M.G. GRIGG, G. C. BEARD, L. A. SUMMERS, G. |
author_facet |
WELLS, R. M.G. GRIGG, G. C. BEARD, L. A. SUMMERS, G. |
author_sort |
WELLS, R. M.G. |
title |
Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki |
title_short |
Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki |
title_full |
Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki |
title_fullStr |
Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki |
title_full_unstemmed |
Hypoxic Responses in a Fish From a Stable Environment: Blood Oxygen Transport in the Antarctic Fish Pagothenia Borchgrevinki |
title_sort |
hypoxic responses in a fish from a stable environment: blood oxygen transport in the antarctic fish pagothenia borchgrevinki |
publisher |
Company of Biologists |
publishDate |
1989 |
url |
http://jeb.biologists.org/cgi/content/short/141/1/97 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://jeb.biologists.org/cgi/content/short/141/1/97 |
op_rights |
Copyright (C) 1989, Company of Biologists |
_version_ |
1766085658600800256 |