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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Aerobic and behavioral flexibility allow estuarine gastropods to flourish in rapidly changing and extreme pH conditions
Marine Biology, Volume 164, No. 5, Article 97, Year 2017
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Description
Despite efforts to understand marine organismal responses to ocean acidification (gradual change in pH/pCO2 over decades), there is a lack of information about the capabilities of coastal organisms to endure rapid and extreme pH change (often full units within hours). We predicted that gastropods faced with estuarine acidification avoid extreme pH exposure through isolation and/or escape behavior, and energetically compensate for feeding and energy uptake limitations by facultative metabolic depression (FMD). To test this, we studied behavioral (organism activity) and aerobic (cardiac performance) responses to acidification in two closely related tropical intertidal species, the estuarine Indothais gradata (two populations) and the open-shore Reishia bitubercularis. Snails were exposed in the laboratory to either acutely declining or stable low pH conditions, using two acidification modes (HNO3-acidification and CO2-aeration). Under acutely declining pH, aerobic performance was regulated to unexpectedly low pH levels (4.5), effectively extending the field pH range for activity. This pH performance threshold marked the onset of behavioral isolation and FMD (as opposed to respiratory stress) and was lower in Indothais than Reishia snails during mineral acidification. Behavioral (in isolated gastropods) and environmental hypercapnic acidosis complicates interpretation of lowered metabolic performance. Stable reduced pH exposures resulted in different behavioral and physiological responses by the Indothais populations, including more prominent escape from water in the seaward population. Overall, these results suggest that aerobic and behavioral flexibility are crucial to organismal fitness in widely fluctuating pH circumstances. They further warn against overgeneralizing marine acidification consequences across physiological dispositions, taxonomic levels, and ecological systems. © 2017, Springer-Verlag Berlin Heidelberg.
Authors & Co-Authors
Harley, Christopher D.G.
Canada, Vancouver
The University of British Columbia
Steele, Michael
Brunei Darussalam, Bandar Seri Begawan
Universiti Brunei Darussalam
Australia, Sydney
Australian Catholic University
Marshall, David J.
Brunei Darussalam, Bandar Seri Begawan
Universiti Brunei Darussalam
Statistics
Citations: 13
Authors: 3
Affiliations: 4
Identifiers
Doi:
10.1007/s00227-017-3124-y
ISSN:
00253162
Research Areas
Environmental
Mental Health
Noncommunicable Diseases
Study Design
Cross Sectional Study