Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines
Metabolic potentials of 16 species of chaetognaths were estimated by measuring the activities of citrate synthase (CS) and pyruvate kinase (PK) and correlating these activities with oxygen consumption rates measured on the same individuals. Furthermore, CS activities were generally higher than PK ac...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.1993.38.5.0935 2024-09-15T17:43:31+00:00 Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines Thuesen, Erik V. Childress, James J. 1993 http://dx.doi.org/10.4319/lo.1993.38.5.0935 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1993.38.5.0935 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1993.38.5.0935 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 38, issue 5, page 935-948 ISSN 0024-3590 1939-5590 journal-article 1993 crwiley https://doi.org/10.4319/lo.1993.38.5.0935 2024-07-25T04:23:33Z Metabolic potentials of 16 species of chaetognaths were estimated by measuring the activities of citrate synthase (CS) and pyruvate kinase (PK) and correlating these activities with oxygen consumption rates measured on the same individuals. Furthermore, CS activities were generally higher than PK activities, suggesting that chaetognaths are aerobically poised in their metabolism. Metabolic rates and enzyme activities were examined with regard to body size and minimum depths of occurrence. There was an overall decline in both oxygen consumption and enzyme activities with body mass in interspecific comparisons. The highest CS and PK activities were measured in individuals of the bathypelagic species Caecosagitta macrocephala. The lowest enzyme activities measured in a southern California chaetognath were in the mesopelagic species Pseudosagitta maxima. The lowest overall PK activity was measured in the antarctic species Pseudosagitta gazellae. In contrast to the rapid declines in metabolic potential with depth that have been observed for pelagic fish and crustaceans, no decline in metabolic rate nor in enzyme activities can be ascribed to depth of occurrence for pelagic chaetognaths. Below depths of several hundred meters, chaetognaths have metabolic rates comparable to those of meso‐ and bathypelagic fish and crustaceans. Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library Limnology and Oceanography 38 5 935 948 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Metabolic potentials of 16 species of chaetognaths were estimated by measuring the activities of citrate synthase (CS) and pyruvate kinase (PK) and correlating these activities with oxygen consumption rates measured on the same individuals. Furthermore, CS activities were generally higher than PK activities, suggesting that chaetognaths are aerobically poised in their metabolism. Metabolic rates and enzyme activities were examined with regard to body size and minimum depths of occurrence. There was an overall decline in both oxygen consumption and enzyme activities with body mass in interspecific comparisons. The highest CS and PK activities were measured in individuals of the bathypelagic species Caecosagitta macrocephala. The lowest enzyme activities measured in a southern California chaetognath were in the mesopelagic species Pseudosagitta maxima. The lowest overall PK activity was measured in the antarctic species Pseudosagitta gazellae. In contrast to the rapid declines in metabolic potential with depth that have been observed for pelagic fish and crustaceans, no decline in metabolic rate nor in enzyme activities can be ascribed to depth of occurrence for pelagic chaetognaths. Below depths of several hundred meters, chaetognaths have metabolic rates comparable to those of meso‐ and bathypelagic fish and crustaceans. |
format |
Article in Journal/Newspaper |
author |
Thuesen, Erik V. Childress, James J. |
spellingShingle |
Thuesen, Erik V. Childress, James J. Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines |
author_facet |
Thuesen, Erik V. Childress, James J. |
author_sort |
Thuesen, Erik V. |
title |
Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines |
title_short |
Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines |
title_full |
Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines |
title_fullStr |
Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines |
title_full_unstemmed |
Enzymatic activities and metabolic rates of pelagic chaetognaths: Lack of depth‐related declines |
title_sort |
enzymatic activities and metabolic rates of pelagic chaetognaths: lack of depth‐related declines |
publisher |
Wiley |
publishDate |
1993 |
url |
http://dx.doi.org/10.4319/lo.1993.38.5.0935 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.1993.38.5.0935 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.1993.38.5.0935 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Limnology and Oceanography volume 38, issue 5, page 935-948 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.1993.38.5.0935 |
container_title |
Limnology and Oceanography |
container_volume |
38 |
container_issue |
5 |
container_start_page |
935 |
op_container_end_page |
948 |
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1810490525946478592 |