Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion
Submerged lobsters at 15°C were normoxaemic (Ca O O2 = 0.52 mmol l-1 at a Pa O O2 of 6.53 kPa) and normocapnic (Pa CO CO2 = 0.44kPa; [HCO 3 -] = 9.3mequiv l-1 and pHa = 7.78). After 3h in air the haemolymph was markedly hypoxic and hypercapnic (Pa O O2 = 1.6 kPa; Ca O O2 0.2 mmol l-1; Pa CO CO2 = 0....
Main Authors: | , |
---|---|
Format: | Text |
Language: | English |
Published: |
Company of Biologists
1989
|
Subjects: | |
Online Access: | http://jeb.biologists.org/cgi/content/short/144/1/417 |
id |
fthighwire:oai:open-archive.highwire.org:jexbio:144/1/417 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:jexbio:144/1/417 2023-05-15T16:34:44+02:00 Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion TAYLOR, E. W. WHITELEY, N. M. 1989-07-01 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/144/1/417 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/144/1/417 Copyright (C) 1989, Company of Biologists Journal Articles TEXT 1989 fthighwire 2013-05-28T03:46:59Z Submerged lobsters at 15°C were normoxaemic (Ca O O2 = 0.52 mmol l-1 at a Pa O O2 of 6.53 kPa) and normocapnic (Pa CO CO2 = 0.44kPa; [HCO 3 -] = 9.3mequiv l-1 and pHa = 7.78). After 3h in air the haemolymph was markedly hypoxic and hypercapnic (Pa O O2 = 1.6 kPa; Ca O O2 0.2 mmol l-1; Pa CO CO2 = 0.7kPa and pHa = 7.64). Disturbance after 3h in air caused a greater increase in Pa CO CO2 to 1.28 kPa and a fourfold increase in lactate levels to 3.6 mmol 1-1. The combined respiratory and metabolic acidosis reduced pHa to 7.39. After 14 h in air, undisturbed lobsters remained hypoxic and hypercapnic (Pa O O2 = 1.2kPa; Pa CO CO2 = 1.2kPa). Lactate levels had increased to 6.2 mmol l-1. Despite this clear limit on respiratory gas exchange in air, oxygen transport by the haemolymph was restored. A rise in buffer base ([HCO 3 -] = l5.8 mequiv l-1) compensated for the potential respiratory and metabolic acidosis and pH was unchanged at 7.63. The combined effects of the increase in lactate ( logP 50 / log[lactate] = -0.175) and calcium ( logP 50 / log[Ca2+] = -0.20 at pH7.63) levels contributed to an increase in oxygen affinity of haemocyanin at constant pH. Consequently, mean Ca O O2 increased from 0.2 to 0.38 mmol l-1 between 3h and 14h in air. Resubmergence after 14 h in air resulted in a transient alkalosis due to retention of bicarbonate; oxygen and CO 2 were rapidly restored to submerged levels. The lobster possesses the appropriate respiratory adaptations for survival during the relatively long periods of exposure in air encountered during commercial shipment. Text Homarus gammarus HighWire Press (Stanford University) |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Journal Articles |
spellingShingle |
Journal Articles TAYLOR, E. W. WHITELEY, N. M. Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion |
topic_facet |
Journal Articles |
description |
Submerged lobsters at 15°C were normoxaemic (Ca O O2 = 0.52 mmol l-1 at a Pa O O2 of 6.53 kPa) and normocapnic (Pa CO CO2 = 0.44kPa; [HCO 3 -] = 9.3mequiv l-1 and pHa = 7.78). After 3h in air the haemolymph was markedly hypoxic and hypercapnic (Pa O O2 = 1.6 kPa; Ca O O2 0.2 mmol l-1; Pa CO CO2 = 0.7kPa and pHa = 7.64). Disturbance after 3h in air caused a greater increase in Pa CO CO2 to 1.28 kPa and a fourfold increase in lactate levels to 3.6 mmol 1-1. The combined respiratory and metabolic acidosis reduced pHa to 7.39. After 14 h in air, undisturbed lobsters remained hypoxic and hypercapnic (Pa O O2 = 1.2kPa; Pa CO CO2 = 1.2kPa). Lactate levels had increased to 6.2 mmol l-1. Despite this clear limit on respiratory gas exchange in air, oxygen transport by the haemolymph was restored. A rise in buffer base ([HCO 3 -] = l5.8 mequiv l-1) compensated for the potential respiratory and metabolic acidosis and pH was unchanged at 7.63. The combined effects of the increase in lactate ( logP 50 / log[lactate] = -0.175) and calcium ( logP 50 / log[Ca2+] = -0.20 at pH7.63) levels contributed to an increase in oxygen affinity of haemocyanin at constant pH. Consequently, mean Ca O O2 increased from 0.2 to 0.38 mmol l-1 between 3h and 14h in air. Resubmergence after 14 h in air resulted in a transient alkalosis due to retention of bicarbonate; oxygen and CO 2 were rapidly restored to submerged levels. The lobster possesses the appropriate respiratory adaptations for survival during the relatively long periods of exposure in air encountered during commercial shipment. |
format |
Text |
author |
TAYLOR, E. W. WHITELEY, N. M. |
author_facet |
TAYLOR, E. W. WHITELEY, N. M. |
author_sort |
TAYLOR, E. W. |
title |
Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion |
title_short |
Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion |
title_full |
Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion |
title_fullStr |
Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion |
title_full_unstemmed |
Oxygen Transport and Acid-Base Balance in the Haemolymph of the Lobster, Homarus Gammarus, During Aerial Exposure and Resubmersion |
title_sort |
oxygen transport and acid-base balance in the haemolymph of the lobster, homarus gammarus, during aerial exposure and resubmersion |
publisher |
Company of Biologists |
publishDate |
1989 |
url |
http://jeb.biologists.org/cgi/content/short/144/1/417 |
genre |
Homarus gammarus |
genre_facet |
Homarus gammarus |
op_relation |
http://jeb.biologists.org/cgi/content/short/144/1/417 |
op_rights |
Copyright (C) 1989, Company of Biologists |
_version_ |
1766024711914913792 |