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Adaptation and acclimatization to ocean acidification in marine ectotherms: An in situ transplant experiment with polychaetes at a shallow CO<inf>2</inf> vent system

Journal article
Authors Piero Calosi
Samuel P.S. Rastrick
Chiara Lombardi
Heidi J. de Guzman
Laura Davidson
Marlene Jahnke
Adriana Giangrande
Jörg D. Hardege
Anja Schulze
John I. Spicer
Maria Cristina Gambi
Published in Philosophical Transactions of the Royal Society B: Biological Sciences
Volume 368
ISSN 09628436
Publication year 2013
Published at
Language en
Keywords Adaptation, Climate change, Mass extinction, Metabolic rate, Ocean acidification, Plasticity
Subject categories Biological Sciences

Abstract

Metabolic rate determines the physiological and life-history performances of ectotherms. Thus, the extent to which such rates are sensitive and plastic to environmental perturbation is central to an organism's ability to function in a changing environment. Little is known of long-term metabolic plasticity and potential for metabolic adaptation in marine ectotherms exposed to elevated pCO2. Consequently, we carried out a series of in situ transplant experiments using a number of tolerant and sensitive polychaete species living around a natural CO2 vent system. Here, we show that a marine metazoan (i.e. Platynereis dumerilii) was able to adapt to chronic and elevated levels of pCO2. The vent population of P. dumerilii was physiologically and genetically different from nearby populations that experience low pCO2, as well as smaller in body size. By contrast, different populations of Amphiglena mediterranea showed marked physiological plasticity indicating that adaptation or acclimatization are both viable strategies for the successful colonization of elevated pCO2 environments. In addition, sensitive species showed either a reduced or increased metabolism when exposed acutely to elevated pCO2. Our findings may help explain, from a metabolic perspective, the occurrence of past mass extinction, as well as shed light on alternative pathways of resilience in species facing ongoing ocean acidification. © 2013 The Author(s) Published by the Royal Society. All rights reserved.

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