Ocean acidification does not limit squid metabolism via blood oxygen supply

Birk, Matthew A.; McLean, Erin L.; Seibel, Brad A.

doi:10.1242/jeb.187443

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i

Ocean acidification does not limit squid metabolism via blood oxygen supply

2018
By Birk, Matthew A. ; McLean, Erin L. ; Seibel, Brad A.
Source: Journal of Experimental Biology (2018)

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Journal Title:

Journal of Experimental Biology
Personal Author:

Birk, Matthew A. ; McLean, Erin L. ; Seibel, Brad A.

Birk, Matthew A. ; McLean, Erin L. ; Seibel, Brad A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Ocean acidification is hypothesized to limit the performance of squids due to their exceptional oxygen demand and pH-sensitivity of blood-oxygen binding, which may reduce oxygen supply in acidified waters. The critical oxygen partial pressure (Pcrit), the PO2 below which oxygen supply cannot match basal demand, is a commonly reported index of hypoxia tolerance. Any CO2-induced reduction in oxygen supply should be apparent as an increase in Pcrit. In this study, we assessed the effects of CO2 (46-143 Pa; 455-1410 μatm) on the metabolic rate and Pcrit of two squid species - Dosidicus gigas and Doryteuthis pealeii - through manipulative experiments. We also developed a model, with inputs for hemocyanin pH-sensitivity, blood PCO2, and buffering capacity that simulates blood oxygen supply under varying seawater CO2 partial pressures. We compare model outputs to measured Pcrit in squids. Using blood-O2 parameters from the literature for model inputs, we estimated that, in the absence of blood acid-base regulation, an increase in seawater PCO2 to 100 Pa (≈ 1000 μatm) would result in a maximum drop in arterial hemocyanin-O2 saturation by 1.6% at normoxia and a Pcrit increase of ≈0.5 kPa. Our live-animal experiments support this supposition, as CO2 had no effect on measured metabolic rate or Pcrit in either squid species.
Keywords:

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Animal Science And Zoology Aquatic Science Ecology, Evolution, Behavior And Systematics Insect Science Molecular Biology Physiology
Source:

Journal of Experimental Biology (2018)
DOI:

https://doi.org/10.1242/jeb.187443
ISSN:

1477-9145;0022-0949;
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PDF
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The Company of Biologists
Document Type:

Journal Article
Funding:

Grant no. NA17OAR4310081
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urn:sha256:4f9c515ce309f6eb41a9e87cd56e6952b72d8b4dae21ea01022496ff12000d56
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Ocean acidification does not limit squid metabolism via blood oxygen supply

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