ORCID Profile
0000-0002-8280-9422
Current Organisation
James Cook University
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Publisher: Elsevier BV
Date: 11-2020
Publisher: The Company of Biologists
Date: 03-2018
DOI: 10.1242/JEB.154559
Abstract: Aquatic acidification, caused by elevating levels of atmospheric carbon dioxide (CO2), is increasing in both freshwater and marine ecosystems worldwide. However, few studies have examined how acidification will affect oxygen (O2) transport and, therefore, performance in fishes. Although data are generally lacking, the majority of fishes investigated in this meta-analysis exhibited no effect of elevated CO2 at the level of O2 uptake, suggesting that they are able to maintain metabolic performance during a period of acidosis. Notably, the mechanisms that fish employ to maintain performance and O2 uptake have yet to be verified. Here, we summarize current data related to one recently proposed mechanism underpinning the maintenance of O2 uptake during exposure to aquatic acidification, and reveal knowledge gaps that could be targeted for future research. Most studies have examined O2 uptake rates while fishes were resting and did not calculate aerobic scope, even though aerobic scope can aid in predicting changes to whole-animal metabolic performance. Furthermore, research is lacking on different age classes, freshwater species and elasmobranchs, all of which might be impacted by future acidification conditions. Finally, this Review further seeks to emphasize the importance of developing collaborative efforts between molecular, physiological and ecological approaches in order to provide more comprehensive predictions as to how future fish populations will be affected by climate change.
Publisher: American Physiological Society
Date: 07-2018
DOI: 10.1152/AJPREGU.00238.2017
Abstract: Multiple environmental stressors may interact in complex ways to exceed or diminish the impacts of in idual stressors. In the present study, the interactive effects of two ecologically relevant stressors [increased temperature and partial pressure of carbon dioxide (Pco 2 )] were assessed for freshwater mussels, a group of organisms that are among the most sensitive and rapidly declining worldwide. The in idual and combined effects of elevated temperature (22°C–34°C) and Pco 2 (~230, 58,000 µatm) on juvenile L silis siliquoidea were quantified over a 5- or 14-day period, during which physiological and whole animal responses were measured. Exposure to elevated temperature induced a series of physiological responses, including an increase in oxygen consumption rates following 5 days of exposure at 31°C and an increase in carbonic anhydrase ( ca) and heat shock protein 70 mRNA levels following 14 days of exposure at 28°C and 34°C, respectively. Treatment with elevated Pco 2 activated acid-base regulatory responses including increases in CA and Na + -K + -ATPase activity and a novel mechanism for acid-base regulation during Pco 2 exposure in freshwater mussels was proposed. Thermal and CO 2 stressors also interacted such that responses to the thermal stressor were diminished in mussels exposed to elevated Pco 2 , resulting in the greatest level of mortality. Additionally, larger mussels were more likely to survive treatment with elevated Pco 2 and/or temperature. Together, exposure to elevated Pco 2 may compromise the ability of juvenile freshwater mussels to respond to additional stressors, such as increased temperatures, highlighting the importance of considering not only the in idual but also the interactive effects of multiple environmental stressors.
Publisher: Elsevier BV
Date: 11-2016
DOI: 10.1016/J.CBPA.2016.07.009
Abstract: Changes in environmental conditions can act as stressors, with potential consequences for the health and fitness of organisms. Rising levels of carbon dioxide (CO2) is one potential environmental stressor that is occurring more frequently in the environment and can be a stressor for aquatic organisms. In this study, the physiological responses of two species of unionid mussel, L silis siliquoidea and Amblema plicata, were assessed in response to exposure to two levels of elevated partial pressure of CO2 (pCO2) (~20,000 and ~55,000μatm) over a 28d period, followed by a subsequent 14d recovery period. Observations were consistent with responses associated with respiratory acidosis, as demonstrated by changes in hemolymph HCO3(-), Ca(2+), Cl(-), and Na(2+). Both species exposed to elevated pCO2 had elevated hemolymph HCO3(-) during the pCO2 treatment period compared to control mussels, but recovered once pCO2 was removed. Similarly, both species had elevated hemolymph Na(+) during exposure to elevated pCO2, and this returned to control levels for A. plicata but remained elevated for L. siliquoidea once the pCO2 stimuli was removed. Changes in hemolymph Ca(2+) and Cl(-) in response to elevated pCO2 were also observed, but these changes were species-specific. Additional physiological responses to elevated pCO2 (e.g., changes in hemolymph glucose and Mg(2+)) were consistent with a stress response in both species. This study demonstrates the importance of considering inter-specific differences in the response of organisms to stress, and also that responses to elevated pCO2 may be transient and can recover once the stress is removed.
Publisher: Springer Science and Business Media LLC
Date: 17-05-2017
DOI: 10.1007/S11356-017-9160-9
Abstract: Freshwater mussels are at-risk taxa and may be exposed to high levels of carbon dioxide (CO
Publisher: Springer Science and Business Media LLC
Date: 09-08-2017
Publisher: Springer Science and Business Media LLC
Date: 29-07-2016
DOI: 10.1007/S00360-016-1023-Z
Abstract: Freshwater mussels are some of the most imperiled species in North America and are particularly susceptible to environmental change. One environmental disturbance that mussels may encounter that remains understudied is an increase in the partial pressure of CO
Publisher: Elsevier BV
Date: 2021
Publisher: Springer Science and Business Media LLC
Date: 16-07-2020
Publisher: Oxford University Press (OUP)
Date: 2016
Publisher: Canadian Science Publishing
Date: 04-2073
Abstract: Zones of elevated carbon dioxide (CO 2 ) have the potential to deter the movement of fishes. Should CO 2 be used as a barrier, non-target organisms, such as freshwater mussels, have the potential to be impacted. In this study, the physiological responses of adult Fusconaia flava exposed to elevated partial pressures of CO 2 (pCO 2 ) over both short-term (6 h exposure with 6 h recovery) and long-term (4-, 8-, and 32-day exposure) periods were measured. A 6 h exposure to either ∼15 000 μatm (1 atm = 101.325 kPa) or ∼200 000 μatm caused an elevation in hemolymph Ca 2+ . Exposure to ∼200 000 μatm resulted in a decrease in hemolymph Cl − , and exposure to ∼15 000 μatm caused an increase in hemolymph Na + , whereas ∼200 000 μatm caused a decrease. Exposure to elevated pCO 2 for long-term periods caused a decrease in hemolymph Mg 2+ and an initial increase in hemolymph Ca 2+ . Body condition and hemolymph glucose were not significantly influenced by elevated pCO 2 for both experiments. This study shows that elevated pCO 2 had limited impacts on the physiological responses of adult freshwater mussels.
Publisher: Wiley
Date: 13-12-2017
DOI: 10.1002/ETC.3991
Abstract: Freshwater mussels may be exposed to elevations in mean partial pressure of carbon dioxide (pCO
Publisher: Springer Science and Business Media LLC
Date: 28-09-2015
Location: United States of America
No related grants have been discovered for Kelly Hannan.