| Physiological benefits of being small in a changing world: responses of Coho salmon (Oncorhynchus kisutch) to an acute thermal challenge and a simulated capture event. | |
| | |
MedLine Citation:
|
PMID: 22720035 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Evidence is building to suggest that both chronic and acute warm temperature exposure, as well as other anthropogenic perturbations, may select for small adult fish within a species. To shed light on this phenomenon, we investigated physiological and anatomical attributes associated with size-specific responses to an acute thermal challenge and a fisheries capture simulation (exercise+air exposure) in maturing male coho salmon (Oncorhynchus kisutch). Full-size females were included for a sex-specific comparison. A size-specific response in haematology to an acute thermal challenge (from 7 to 20 °C at 3 °C h(-1)) was apparent only for plasma potassium, whereby full-size males exhibited a significant increase in comparison with smaller males ('jacks'). Full-size females exhibited an elevated blood stress response in comparison with full-size males. Metabolic recovery following exhaustive exercise at 7 °C was size-specific, with jacks regaining resting levels of metabolism at 9.3 ± 0.5 h post-exercise in comparison with 12.3 ± 0.4 h for full-size fish of both sexes. Excess post-exercise oxygen consumption scaled with body mass in male fish with an exponent of b = 1.20 ± 0.08. Jacks appeared to regain osmoregulatory homeostasis faster than full-size males, and they had higher ventilation rates at 1 h post-exercise. Peak metabolic rate during post-exercise recovery scaled with body mass with an exponent of b~1, suggesting that the slower metabolic recovery in large fish was not due to limitations in diffusive or convective oxygen transport, but that large fish simply accumulated a greater 'oxygen debt' that took longer to pay back at the size-independent peak metabolic rate of ~6 mg min(-1) kg(-1). Post-exercise recovery of plasma testosterone was faster in jacks compared with full-size males, suggesting less impairment of the maturation trajectory of smaller fish. Supporting previous studies, these findings suggest that environmental change and non-lethal fisheries interactions have the potential to select for small individuals within fish populations over time. |
| | |
Authors:
|
Timothy D Clark; Michael R Donaldson; Sebastian Pieperhoff; S Matthew Drenner; Andrew Lotto; Steven J Cooke; Scott G Hinch; David A Patterson; Anthony P Farrell |
Related Documents
:
|
14980065 - Oxygen-sensing pathways and the development of mammalian gas exchange. 510325 - Tissue po2 during reanimation with hemoglobin solutions. 876965 - Long term oxygen therapy. 6422805 - Blood-gas tensions and acid-base status in ponies during treadmill exercise. 20956865 - Exercise training, physical fitness and the growth hormone-insulin-like growth factor-1... 3414535 - Capacity of blood flow delivery to exercising skeletal muscle in humans. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2012-06-13 |
Journal Detail:
|
Title: PloS one Volume: 7 ISSN: 1932-6203 ISO Abbreviation: PLoS ONE Publication Date: 2012 |
Date Detail:
|
Created Date: 2012-06-21 Completed Date: 2012-12-13 Revised Date: 2013-02-28 |
Medline Journal Info:
|
Nlm Unique ID: 101285081 Medline TA: PLoS One Country: United States |
Other Details:
|
Languages: eng Pagination: e39079 Citation Subset: IM |
Affiliation:
|
Department of Forest Sciences, University of British Columbia, Vancouver, British Columbia, Canada. timothy.clark.mail@gmail.com |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Body Weight Female Male Oncorhynchus kisutch / physiology* Oxygen Consumption Temperature |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Genetic evidence for restricted dispersal along continuous altitudinal gradients in a climate change...
Next Document: Activation of type III interferon genes by pathogenic bacteria in infected epithelial cells and mous...