Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges
Hemoglobin (Hb) polymorphism in cod is associated with temperature‐related differences in biogeographical distribution, and several authors have suggested that functional characteristics of the various hemoglobin isoforms (HbIs) directly influence phenotypic traits such as growth rate. However, no s...
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ftdeakinunifig:oai:figshare.com:article/20982028 2023-05-15T15:27:26+02:00 Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges A Gamperl C Busby T Hori Luis Afonso J Hall 2009-09-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30047900 https://figshare.com/articles/journal_contribution/Hemoglobin_genotype_has_minimal_influence_on_the_physiological_response_of_juvenile_atlantic_cod_Gadus_morhua_to_environmental_challenges/20982028 unknown http://hdl.handle.net/10536/DRO/DU:30047900 https://figshare.com/articles/journal_contribution/Hemoglobin_genotype_has_minimal_influence_on_the_physiological_response_of_juvenile_atlantic_cod_Gadus_morhua_to_environmental_challenges/20982028 All Rights Reserved Physiology Zoology biogeography blood environmental factor gadoid genotype growth rate hemoglobin hypoxia juvenile physiological response polymorphism Science & Technology Life Sciences & Biomedicine OXYGEN-BINDING-PROPERTIES PREFERRED TEMPERATURE STRESS RESPONSES MARINE FISHES GROWTH L PERFORMANCE VARIANTS Text Journal contribution 2009 ftdeakinunifig 2022-11-17T22:05:57Z Hemoglobin (Hb) polymorphism in cod is associated with temperature‐related differences in biogeographical distribution, and several authors have suggested that functional characteristics of the various hemoglobin isoforms (HbIs) directly influence phenotypic traits such as growth rate. However, no study has directly examined whether Hb genotype translates into physiological differences at the whole animal level. Thus, we generated a family of juvenile Atlantic cod consisting of all three main Hb genotypes (HbI‐1/1, HbI‐2/2, and HbI‐1/2) by crossing a single pair of heterozygous parents, and we compared their metabolic and cortisol responses to an acute thermal challenge (10°C to their critical thermal maximum [CTM] or 22°C, respectively) and tolerance of graded hypoxia. There were no differences in routine metabolism (at 10°C), maximum metabolic rate, metabolic scope, CTM (overall mean 22.9° ± 0.2°C), or resting and poststress plasma cortisol levels among Hb genotypes. Further, although the HbI‐1/1 fish grew more (by 15%–30% during the first 9 mo) when reared at 10° ± 1°C and had a slightly enhanced hypoxia tolerance at 10°C (e.g., the critical O2 levels for HbI‐1/1, HbI‐2/2, and HbI‐1/2 cod were 35.56% ± 1.24%, and 40.20% ± 1.99% air saturation, respectively), these results are contradictory to expectations based on HbI functional properties. Thus, our findings (1) do not support previous assumptions that growth rate differences among cod Hb genotypes result from a more efficient use of the oxygen supply—that is, reduced standard metabolic rates and/or increased metabolic capacity—and (2) suggest that in juvenile cod, there is no selective advantage to having a particular Hb genotype with regards to the capacity to withstand ecologically relevant environmental challenges. Other Non-Article Part of Journal/Newspaper atlantic cod Gadus morhua DRO - Deakin Research Online |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Physiology Zoology biogeography blood environmental factor gadoid genotype growth rate hemoglobin hypoxia juvenile physiological response polymorphism Science & Technology Life Sciences & Biomedicine OXYGEN-BINDING-PROPERTIES PREFERRED TEMPERATURE STRESS RESPONSES MARINE FISHES GROWTH L PERFORMANCE VARIANTS |
spellingShingle |
Physiology Zoology biogeography blood environmental factor gadoid genotype growth rate hemoglobin hypoxia juvenile physiological response polymorphism Science & Technology Life Sciences & Biomedicine OXYGEN-BINDING-PROPERTIES PREFERRED TEMPERATURE STRESS RESPONSES MARINE FISHES GROWTH L PERFORMANCE VARIANTS A Gamperl C Busby T Hori Luis Afonso J Hall Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges |
topic_facet |
Physiology Zoology biogeography blood environmental factor gadoid genotype growth rate hemoglobin hypoxia juvenile physiological response polymorphism Science & Technology Life Sciences & Biomedicine OXYGEN-BINDING-PROPERTIES PREFERRED TEMPERATURE STRESS RESPONSES MARINE FISHES GROWTH L PERFORMANCE VARIANTS |
description |
Hemoglobin (Hb) polymorphism in cod is associated with temperature‐related differences in biogeographical distribution, and several authors have suggested that functional characteristics of the various hemoglobin isoforms (HbIs) directly influence phenotypic traits such as growth rate. However, no study has directly examined whether Hb genotype translates into physiological differences at the whole animal level. Thus, we generated a family of juvenile Atlantic cod consisting of all three main Hb genotypes (HbI‐1/1, HbI‐2/2, and HbI‐1/2) by crossing a single pair of heterozygous parents, and we compared their metabolic and cortisol responses to an acute thermal challenge (10°C to their critical thermal maximum [CTM] or 22°C, respectively) and tolerance of graded hypoxia. There were no differences in routine metabolism (at 10°C), maximum metabolic rate, metabolic scope, CTM (overall mean 22.9° ± 0.2°C), or resting and poststress plasma cortisol levels among Hb genotypes. Further, although the HbI‐1/1 fish grew more (by 15%–30% during the first 9 mo) when reared at 10° ± 1°C and had a slightly enhanced hypoxia tolerance at 10°C (e.g., the critical O2 levels for HbI‐1/1, HbI‐2/2, and HbI‐1/2 cod were 35.56% ± 1.24%, and 40.20% ± 1.99% air saturation, respectively), these results are contradictory to expectations based on HbI functional properties. Thus, our findings (1) do not support previous assumptions that growth rate differences among cod Hb genotypes result from a more efficient use of the oxygen supply—that is, reduced standard metabolic rates and/or increased metabolic capacity—and (2) suggest that in juvenile cod, there is no selective advantage to having a particular Hb genotype with regards to the capacity to withstand ecologically relevant environmental challenges. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
A Gamperl C Busby T Hori Luis Afonso J Hall |
author_facet |
A Gamperl C Busby T Hori Luis Afonso J Hall |
author_sort |
A Gamperl |
title |
Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges |
title_short |
Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges |
title_full |
Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges |
title_fullStr |
Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges |
title_full_unstemmed |
Hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (Gadus morhua) to environmental challenges |
title_sort |
hemoglobin genotype has minimal influence on the physiological response of juvenile atlantic cod (gadus morhua) to environmental challenges |
publishDate |
2009 |
url |
http://hdl.handle.net/10536/DRO/DU:30047900 https://figshare.com/articles/journal_contribution/Hemoglobin_genotype_has_minimal_influence_on_the_physiological_response_of_juvenile_atlantic_cod_Gadus_morhua_to_environmental_challenges/20982028 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30047900 https://figshare.com/articles/journal_contribution/Hemoglobin_genotype_has_minimal_influence_on_the_physiological_response_of_juvenile_atlantic_cod_Gadus_morhua_to_environmental_challenges/20982028 |
op_rights |
All Rights Reserved |
_version_ |
1766357865656745984 |