Projected near-future CO2 levels increase activity and alter defensive behaviours in the tropical squid Idiosepius pygmaeus

Abstract [Related Publication]: Carbon dioxide (CO₂) levels projected to occur in the oceans by the end of this century cause a range of behavioural effects in fish, but whether other highly active marine organisms, such as cephalopods, are similarly affected is unknown. We tested the effects of projected future CO₂ levels (626 and 956 µatm) on the behaviour of male two-toned pygmy squid, Idiosepius pygmaeus. Exposure to elevated CO₂ increased the number of active individuals by 19–25% and increased movement (number of line-crosses) by nearly 3 times compared to squid at present-day CO₂. Squid vigilance and defensive behaviours were also altered by elevated CO₂ with >80% of individuals choosing jet escape responses over defensive arm postures in response to a visual startle stimulus, compared with 50% choosing jet escape responses at control CO₂. In addition, more escape responses were chosen over threat behaviours in body pattern displays at elevated CO₂ and individuals were more than twice as likely to use ink as a defence strategy at 956 µatm CO₂, compared with controls. Increased activity could lead to adverse effects on energy budgets as well as increasing visibility to predators. A tendency to respond to a stimulus with escape behaviours could increase survival, but may also be energetically costly and could potentially lead to more chases by predators compared with individuals that use defensive postures. These results demonstrate that projected future ocean acidification affects the behaviours of a tropical squid species.

The full methodology is available in the Open Access publication from the Related Publications link below.

    Data Record Details
    Data record related to this publication Projected near-future CO2 levels increase activity and alter defensive behaviours in the tropical squid Idiosepius pygmaeus
    Data Publication title Projected near-future CO2 levels increase activity and alter defensive behaviours in the tropical squid Idiosepius pygmaeus
  • Description

    Abstract [Related Publication]: Carbon dioxide (CO₂) levels projected to occur in the oceans by the end of this century cause a range of behavioural effects in fish, but whether other highly active marine organisms, such as cephalopods, are similarly affected is unknown. We tested the effects of projected future CO₂ levels (626 and 956 µatm) on the behaviour of male two-toned pygmy squid, Idiosepius pygmaeus. Exposure to elevated CO₂ increased the number of active individuals by 19–25% and increased movement (number of line-crosses) by nearly 3 times compared to squid at present-day CO₂. Squid vigilance and defensive behaviours were also altered by elevated CO₂ with >80% of individuals choosing jet escape responses over defensive arm postures in response to a visual startle stimulus, compared with 50% choosing jet escape responses at control CO₂. In addition, more escape responses were chosen over threat behaviours in body pattern displays at elevated CO₂ and individuals were more than twice as likely to use ink as a defence strategy at 956 µatm CO₂, compared with controls. Increased activity could lead to adverse effects on energy budgets as well as increasing visibility to predators. A tendency to respond to a stimulus with escape behaviours could increase survival, but may also be energetically costly and could potentially lead to more chases by predators compared with individuals that use defensive postures. These results demonstrate that projected future ocean acidification affects the behaviours of a tropical squid species.

    The full methodology is available in the Open Access publication from the Related Publications link below.

  • Other Descriptors
  • Data type dataset
  • Keywords
    • ocean acidification
    • cephalopod
    • anti-predator behaviour
    • escape
    • avoidance
    • startle response
    • ARC Centre of Excellence for Coral Reef Studies
  • Funding source
  • Research grant(s)/Scheme name(s)
  • Research themes
    Tropical Ecosystems, Conservation and Climate Change
    FoR Codes (*)
    • 060205 - Marine and Estuarine Ecology (incl. Marine Ichthyology)
    SEO Codes
    • 960307 - Effects of Climate Change and Variability on Australia (excl. Social Impacts)
    Specify spatial or temporal setting of the data
    Temporal (time) coverage
  • Start Date 2013/09/01
  • End Date 2014/09/24
  • Time Period
    Spatial (location) coverage
  • Locations
    • Squid were collected from Cleveland Bay, Townsville, Queensland, Australia (19°25′S, 146°82′E) and transferred to James Cook University
    Data Locations

    Type Location Notes
    Attachment Spady_et_al._2014_DATAHub.xlsx MS Excel (.xlsx) format
    Attachment Spady_et_al._2014_DATAHub.ods Open Document (.ods) format
    The Data Manager is: Blake Spady
    College or Centre
    Access conditions Open
  • Alternative access conditions
  • Data record size 2 files: 59.5 KB
  • Related publications
      Name Spady, Blake L., Watson, Sue-Ann, Chase, Tory J., and Munday, Philip L. (2014) Projected near-future CO2 levels increase activity and alter defensive behaviours in the tropical squid Idiosepius pygmaeus. Biology Open, 3 (11). pp. 1063-1070.
    • URL http://dx.doi.org/10.1242/bio.20149894
    • Notes Open Access
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    Citation Spady, Blake; Watson, Sue-Ann; Chase, Tory; Munday, Philip (2018): Projected near-future CO2 levels increase activity and alter defensive behaviours in the tropical squid Idiosepius pygmaeus. James Cook University. https://doi.org/10.4225/28/5aa75291e25ad