Aerobic performance of two tropical cephalopod species unaltered by prolonged exposure to projected future carbon dioxide levels

Spady, Blake L., Nay, Tiffany J., Rummer, Jodie L., Munday, Philip L., and Watson, Sue-Ann (2019) Aerobic performance of two tropical cephalopod species unaltered by prolonged exposure to projected future carbon dioxide levels. Conservation Physiology, 7 (1). coz024.

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Abstract

Squid and many other cephalopods live continuously on the threshold of their environmental oxygen limitations. If the abilities of squid to effectively take up oxygen are negatively affected by projected future carbon dioxide (CO2) levels in ways similar to those demonstrated in some fish and invertebrates, it could affect the success of squid in future oceans. While there is evidence that acute exposure to elevated CO2 has adverse effects on cephalopod respiratory performance, no studies have investigated this in an adult cephalopod after relatively prolonged exposure to elevated CO2 or determined any effects on the routine and maximal oxygen uptake rates, aerobic scope and recovery time of two tropical cephalopod species, the two- aerobic scope. Here, we tested the effects of prolonged exposure (≥20% of lifespan) to elevated CO2 levels (∼1000 μatm) on tonedpygmy squid, Idiosepius pygmaeus and the bigfin reef squid, Sepioteuthis lessoniana. Neither species exhibited evidence of altered aerobic performance after exposure to elevated CO2 when compared to individuals held at control conditions. The recovery time of I. pygmaeus under both control and elevated CO2 conditions was less than 1 hour, whereas S. lessoniana required approximately 8 hours to recover fully following maximal aerobic performance. This difference in recovery time may be due to the more sedentary behaviours of I. pygmaeus. The ability of these two cephalopod species to cope with prolonged exposure to elevated CO2 without detriment to their aerobic performance suggests some resilience to an increasingly high CO2 world. Key

Item ID: 60492
Item Type: Article (Research - C1)
ISSN: 2051-1434
Keywords: aerobic scope, cephalopod, CO2 respirometry, ocean acidification, oxygen uptake
Copyright Information: Copyright © 2019 The Society for Experimental Biology. This is an Open Access article distributed under the terms of a Creative Commons Attribution (4.0) international license.
Funders: Australian ResearchCouncil (ARC), ARC Centre of Excellence for Coral ReefStudies, PADI Foundation
Research Data: http://doi.org/10.25903/5be228a0df2f3
Date Deposited: 20 Nov 2019 03:25
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change @ 50%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified @ 100%
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