Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea

With global climate change ocean warming and acidification occur concomitantly. The survival and distribution of species will depend on their existing ability to exploit their physiological plasticity. pH regulation and the energetically costly processes involved appear crucial to sustain the perfor...

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Main Authors: Zittier, Zora MC, Bock, Christian, Pörtner, Hans-Otto
Format: Conference Object
Language:unknown
Published: 2012
Subjects:
Online Access:https://epic.awi.de/id/eprint/31301/
https://hdl.handle.net/10013/epic.40120
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spelling ftawi:oai:epic.awi.de:31301 2023-05-15T15:12:34+02:00 Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea Zittier, Zora MC Bock, Christian Pörtner, Hans-Otto 2012-09-26 https://epic.awi.de/id/eprint/31301/ https://hdl.handle.net/10013/epic.40120 unknown Zittier, Z. M. , Bock, C. orcid:0000-0003-0052-3090 and Pörtner, H. O. orcid:0000-0001-6535-6575 (2012) Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea , The Ocean in a High-CO2 World - Third Symposium, Monterey, Caifornia, 24 September 2012 - 27 September 2012 . hdl:10013/epic.40120 EPIC3The Ocean in a High-CO2 World - Third Symposium, Monterey, Caifornia, 2012-09-24-2012-09-27 Conference notRev 2012 ftawi 2021-12-24T15:38:00Z With global climate change ocean warming and acidification occur concomitantly. The survival and distribution of species will depend on their existing ability to exploit their physiological plasticity. pH regulation and the energetically costly processes involved appear crucial to sustain the performance of marine organisms and shaping their sensitivity to ocean acidification. Especially under rising temperatures, small pH disturbances in body fluids might already exert critical impact on physiological processes. We therefore studied the effects of ocean acidification on thermal tolerance and acid-base regulation capacity of a sub-Arctic population of Mytilus edulis. Mussels were acclimated for 4 weeks at 10°C and incubated under normocapnia (390µatm) and hypercapnia (1120μatm) for further 2 weeks, before being subjected to an acute warming protocol (10-28°C; 3°C/night). The temperature induced increase in oxygen consumption led to Q10-values of 2.4 (normocapnia) and 2.2 (hypercapnia) indicating a mild limitation of aerobic metabolism in hypercapnic animals. Anaerobic metabolites accumulated above 25°C indicating an upper critical temperature independent of CO2 albeit anaerobic metabolism was lower under hypercapnia. The decrease in haemolymph pH during warming followed the alphastat pattern, with animals under hypercapnia consistently displaying an acidosis when compared to controls. Mantle intracellular pH was initially maintained during warming before a sudden acidification set in. The intracellular acidosis occurred earlier under hypercapnia indicating reduced energy allocation to intracellular pH regulation. The earlier reduction of energy-dependent processes under combined hypercapnia and warming may enhance passive tolerance to temperature extremes in this intertidal specie. However, permanent hypercapnia may only be sustained at the expense of organismic performance, especially at the limits of the thermal performance window. Conference Object Arctic Arctic Population Climate change Ocean acidification White Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic White Sea
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description With global climate change ocean warming and acidification occur concomitantly. The survival and distribution of species will depend on their existing ability to exploit their physiological plasticity. pH regulation and the energetically costly processes involved appear crucial to sustain the performance of marine organisms and shaping their sensitivity to ocean acidification. Especially under rising temperatures, small pH disturbances in body fluids might already exert critical impact on physiological processes. We therefore studied the effects of ocean acidification on thermal tolerance and acid-base regulation capacity of a sub-Arctic population of Mytilus edulis. Mussels were acclimated for 4 weeks at 10°C and incubated under normocapnia (390µatm) and hypercapnia (1120μatm) for further 2 weeks, before being subjected to an acute warming protocol (10-28°C; 3°C/night). The temperature induced increase in oxygen consumption led to Q10-values of 2.4 (normocapnia) and 2.2 (hypercapnia) indicating a mild limitation of aerobic metabolism in hypercapnic animals. Anaerobic metabolites accumulated above 25°C indicating an upper critical temperature independent of CO2 albeit anaerobic metabolism was lower under hypercapnia. The decrease in haemolymph pH during warming followed the alphastat pattern, with animals under hypercapnia consistently displaying an acidosis when compared to controls. Mantle intracellular pH was initially maintained during warming before a sudden acidification set in. The intracellular acidosis occurred earlier under hypercapnia indicating reduced energy allocation to intracellular pH regulation. The earlier reduction of energy-dependent processes under combined hypercapnia and warming may enhance passive tolerance to temperature extremes in this intertidal specie. However, permanent hypercapnia may only be sustained at the expense of organismic performance, especially at the limits of the thermal performance window.
format Conference Object
author Zittier, Zora MC
Bock, Christian
Pörtner, Hans-Otto
spellingShingle Zittier, Zora MC
Bock, Christian
Pörtner, Hans-Otto
Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea
author_facet Zittier, Zora MC
Bock, Christian
Pörtner, Hans-Otto
author_sort Zittier, Zora MC
title Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea
title_short Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea
title_full Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea
title_fullStr Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea
title_full_unstemmed Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea
title_sort impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of mytilus edulis from the white sea
publishDate 2012
url https://epic.awi.de/id/eprint/31301/
https://hdl.handle.net/10013/epic.40120
geographic Arctic
White Sea
geographic_facet Arctic
White Sea
genre Arctic
Arctic Population
Climate change
Ocean acidification
White Sea
genre_facet Arctic
Arctic Population
Climate change
Ocean acidification
White Sea
op_source EPIC3The Ocean in a High-CO2 World - Third Symposium, Monterey, Caifornia, 2012-09-24-2012-09-27
op_relation Zittier, Z. M. , Bock, C. orcid:0000-0003-0052-3090 and Pörtner, H. O. orcid:0000-0001-6535-6575 (2012) Impact of ocean acidification on the thermal tolerance and acid-base regulation capacity of Mytilus edulis from the White Sea , The Ocean in a High-CO2 World - Third Symposium, Monterey, Caifornia, 24 September 2012 - 27 September 2012 . hdl:10013/epic.40120
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