A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension
The bivalves Arctica islandica and Mytilus edulis generally maintain respiratory independence during hypoxia, but the mechanisms by which this is achieved are very different. In declining oxygen tension, Arctica increases the rate of ventilation down to a low P O 2 of about 7 kPa, while oxygen utili...
Published in: | Proceedings of the Royal Society of London. Series B. Biological Sciences |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Royal Society
1975
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1098/rspb.1975.0105 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1975.0105 |
id |
crroyalsociety:10.1098/rspb.1975.0105 |
---|---|
record_format |
openpolar |
spelling |
crroyalsociety:10.1098/rspb.1975.0105 2024-06-02T08:02:56+00:00 A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension 1975 http://dx.doi.org/10.1098/rspb.1975.0105 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1975.0105 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Proceedings of the Royal Society of London. Series B. Biological Sciences volume 190, issue 1101, page 443-456 ISSN 0080-4649 2053-9193 journal-article 1975 crroyalsociety https://doi.org/10.1098/rspb.1975.0105 2024-05-07T14:16:24Z The bivalves Arctica islandica and Mytilus edulis generally maintain respiratory independence during hypoxia, but the mechanisms by which this is achieved are very different. In declining oxygen tension, Arctica increases the rate of ventilation down to a low P O 2 of about 7 kPa, while oxygen utilization is gradually reduced. In contrast, Mytilus shows only a slight initial increase in ventilation rate, which then falls steadily as the P O 2 of the medium declines, while the oxygen utilization increases sharply. Mytilus which have lost the ability to maintain respiratory independence show little change in oxygen utilization. The increase in ventilation rate of the subtidal Arctica is brought about principally by increasing the duration of the pumping periods, a mechanism not available to Mytilus which, like other intertidal species studied, normally pumps more or less continuously whenever it is immersed. The cardiac responses to hypoxia are very similar in both Arctica and Mytilus heart rate and amplitude increase down to a P O 2 of about 2-4 kPa, below which both decrease rapidly. In Arctica the ventilation/perfusion ratio remains approximately constant over the range of oxygen tension that respiratory independence is maintained. In Mytilus this ratio gradually declines as the ambient P O 2 is reduced. It is suggested that the different respiratory responses to hypoxia of these two species may be due to the different patterns of pumping behaviour related to their different habitats, and to the relative energy costs of pumping blood and water. Article in Journal/Newspaper Arctica islandica The Royal Society Proceedings of the Royal Society of London. Series B. Biological Sciences 190 1101 443 456 |
institution |
Open Polar |
collection |
The Royal Society |
op_collection_id |
crroyalsociety |
language |
English |
description |
The bivalves Arctica islandica and Mytilus edulis generally maintain respiratory independence during hypoxia, but the mechanisms by which this is achieved are very different. In declining oxygen tension, Arctica increases the rate of ventilation down to a low P O 2 of about 7 kPa, while oxygen utilization is gradually reduced. In contrast, Mytilus shows only a slight initial increase in ventilation rate, which then falls steadily as the P O 2 of the medium declines, while the oxygen utilization increases sharply. Mytilus which have lost the ability to maintain respiratory independence show little change in oxygen utilization. The increase in ventilation rate of the subtidal Arctica is brought about principally by increasing the duration of the pumping periods, a mechanism not available to Mytilus which, like other intertidal species studied, normally pumps more or less continuously whenever it is immersed. The cardiac responses to hypoxia are very similar in both Arctica and Mytilus heart rate and amplitude increase down to a P O 2 of about 2-4 kPa, below which both decrease rapidly. In Arctica the ventilation/perfusion ratio remains approximately constant over the range of oxygen tension that respiratory independence is maintained. In Mytilus this ratio gradually declines as the ambient P O 2 is reduced. It is suggested that the different respiratory responses to hypoxia of these two species may be due to the different patterns of pumping behaviour related to their different habitats, and to the relative energy costs of pumping blood and water. |
format |
Article in Journal/Newspaper |
title |
A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension |
spellingShingle |
A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension |
title_short |
A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension |
title_full |
A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension |
title_fullStr |
A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension |
title_full_unstemmed |
A comparative study of the respiratory responses of the bivalves Arctica islandica (L.) and Mytilus edulis L. to declining oxygen tension |
title_sort |
comparative study of the respiratory responses of the bivalves arctica islandica (l.) and mytilus edulis l. to declining oxygen tension |
publisher |
The Royal Society |
publishDate |
1975 |
url |
http://dx.doi.org/10.1098/rspb.1975.0105 https://royalsocietypublishing.org/doi/pdf/10.1098/rspb.1975.0105 |
genre |
Arctica islandica |
genre_facet |
Arctica islandica |
op_source |
Proceedings of the Royal Society of London. Series B. Biological Sciences volume 190, issue 1101, page 443-456 ISSN 0080-4649 2053-9193 |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rspb.1975.0105 |
container_title |
Proceedings of the Royal Society of London. Series B. Biological Sciences |
container_volume |
190 |
container_issue |
1101 |
container_start_page |
443 |
op_container_end_page |
456 |
_version_ |
1800747399964000256 |