Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia
Periodic episodes of low oxygen (hypoxia) and elevated CO2 (hypercapnia) accompanied by low pH occur naturally in Norwegian fjord systems. Under the influence of climate change, the geographic range and intensity of hypoxia and hypercapnia are predicted to increase, especially considering the phenom...
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University of Plymouth
2024
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ftunivplympearl:oai:pearl.plymouth.ac.uk:10026.1/21901 2024-02-11T10:01:07+01:00 Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia Zandt, Emma Ingrid Spicer, John Faculty of Science and Engineering 2024 application/pdf https://pearl.plymouth.ac.uk/handle/10026.1/21901 https://doi.org/10.24382/5132 en eng University of Plymouth 10418470 https://pearl.plymouth.ac.uk/handle/10026.1/21901 http://dx.doi.org/10.24382/5132 2025-01-11T15:38:40Z 12 months Ocean acidification Hypoxia Physiology Metabolic rate Population comparison ResM Thesis Masters 2024 ftunivplympearl https://doi.org/10.24382/5132 2024-01-19T00:07:41Z Periodic episodes of low oxygen (hypoxia) and elevated CO2 (hypercapnia) accompanied by low pH occur naturally in Norwegian fjord systems. Under the influence of climate change, the geographic range and intensity of hypoxia and hypercapnia are predicted to increase, especially considering the phenomenon of Arctic amplification. To examine the metabolic variability and physiological capabilities of amphipods to these stressors, a series of physiological measurements were performed on latitudinal subpopulations (60° and 69°) of the amphipod Echinogammarus marinus, acclimated to different natural thermal regimes. The effects of elevated pCO2 and hypoxia, separate and together, on thermal sensitivity (Q10), metabolic rate, activation energy (Ea), aerobic threshold and aerobic scope were evaluated by determining whole-animal rates of oxygen uptake (MO2). Our results showed no metabolic cold adaptation in the colder-water, high-latitude population (69°). While MO2, aerobic threshold and scope were reduced compared to the more temperate population (60°), there was no difference in resting metabolic rate. After acclimatisation to a common temperature, the populations at 60° showed significantly greater metabolic flexibility by upregulating nearly all measured parameters. The effect of hypoxia, hypercapnia, and their combined effect significantly reduced the MO2, Q10, Ea, aerobic threshold and aerobic scope of the 60° population. At the same time, no changes were observed in the high-latitude population. However, mortality within this population when exposed to the stressors, separately and combined, increased. Amphipods near the northern limit of their distribution show different metabolic responses, with increased sensitivity to elevated pCO2 and hypoxia, than those in the south. Living on the edge of their thermal tolerance range, the scope of these populations to adapt their metabolic activities to compensate for the influence of environmental stressors is severely limited. Considering the phenomenon of Arctic ... Master Thesis Arctic Climate change Ocean acidification PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) Arctic |
institution |
Open Polar |
collection |
PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) |
op_collection_id |
ftunivplympearl |
language |
English |
topic |
Ocean acidification Hypoxia Physiology Metabolic rate Population comparison ResM |
spellingShingle |
Ocean acidification Hypoxia Physiology Metabolic rate Population comparison ResM Zandt, Emma Ingrid Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia |
topic_facet |
Ocean acidification Hypoxia Physiology Metabolic rate Population comparison ResM |
description |
Periodic episodes of low oxygen (hypoxia) and elevated CO2 (hypercapnia) accompanied by low pH occur naturally in Norwegian fjord systems. Under the influence of climate change, the geographic range and intensity of hypoxia and hypercapnia are predicted to increase, especially considering the phenomenon of Arctic amplification. To examine the metabolic variability and physiological capabilities of amphipods to these stressors, a series of physiological measurements were performed on latitudinal subpopulations (60° and 69°) of the amphipod Echinogammarus marinus, acclimated to different natural thermal regimes. The effects of elevated pCO2 and hypoxia, separate and together, on thermal sensitivity (Q10), metabolic rate, activation energy (Ea), aerobic threshold and aerobic scope were evaluated by determining whole-animal rates of oxygen uptake (MO2). Our results showed no metabolic cold adaptation in the colder-water, high-latitude population (69°). While MO2, aerobic threshold and scope were reduced compared to the more temperate population (60°), there was no difference in resting metabolic rate. After acclimatisation to a common temperature, the populations at 60° showed significantly greater metabolic flexibility by upregulating nearly all measured parameters. The effect of hypoxia, hypercapnia, and their combined effect significantly reduced the MO2, Q10, Ea, aerobic threshold and aerobic scope of the 60° population. At the same time, no changes were observed in the high-latitude population. However, mortality within this population when exposed to the stressors, separately and combined, increased. Amphipods near the northern limit of their distribution show different metabolic responses, with increased sensitivity to elevated pCO2 and hypoxia, than those in the south. Living on the edge of their thermal tolerance range, the scope of these populations to adapt their metabolic activities to compensate for the influence of environmental stressors is severely limited. Considering the phenomenon of Arctic ... |
author2 |
Spicer, John Faculty of Science and Engineering |
format |
Master Thesis |
author |
Zandt, Emma Ingrid |
author_facet |
Zandt, Emma Ingrid |
author_sort |
Zandt, Emma Ingrid |
title |
Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia |
title_short |
Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia |
title_full |
Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia |
title_fullStr |
Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia |
title_full_unstemmed |
Intraspecific differences in the metabolic response of amphipods to elevated CO2 and hypoxia |
title_sort |
intraspecific differences in the metabolic response of amphipods to elevated co2 and hypoxia |
publisher |
University of Plymouth |
publishDate |
2024 |
url |
https://pearl.plymouth.ac.uk/handle/10026.1/21901 https://doi.org/10.24382/5132 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Ocean acidification |
genre_facet |
Arctic Climate change Ocean acidification |
op_relation |
10418470 https://pearl.plymouth.ac.uk/handle/10026.1/21901 http://dx.doi.org/10.24382/5132 |
op_rights |
2025-01-11T15:38:40Z 12 months |
op_doi |
https://doi.org/10.24382/5132 |
_version_ |
1790596869733220352 |