Details

Autor(en) / Beteiligte

• Birk, Matthew A
• McLean, Erin L
• Seibel, Brad A

Titel

Ocean acidification does not limit squid metabolism via blood oxygen supply

Ist Teil von

• Journal of experimental biology, 2018-10, Vol.221

Ort / Verlag

England

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 ( ), the below which oxygen supply cannot match basal demand, is a commonly reported index of hypoxia tolerance. Any -induced reduction in oxygen supply should be apparent as an increase in In this study, we assessed the effects of (46-143 Pa; 455-1410 ) on the metabolic rate and of two squid species - and - through manipulative experiments. We also developed a model, with inputs for hemocyanin pH-sensitivity, blood , and buffering capacity that simulates blood oxygen supply under varying seawater partial pressures. We compare model outputs to measured in squids. Using blood- parameters from the literature for model inputs, we estimated that, in the absence of blood acid-base regulation, an increase in seawater to 100 Pa (≈ 1000 ) would result in a maximum drop in arterial hemocyanin- saturation by 1.6% at normoxia and a increase of ≈0.5 kPa. Our live-animal experiments support this supposition, as had no effect on measured metabolic rate or in either squid species.