CO2-level Dependent Effects of Ocean Acidification on Squid, Doryteuthis pealeii, Early Life History
Type
ThesisAuthors
Zakroff, Casey J.
Advisors
Berumen, Michael L.
Committee members
Irigoien, Xabier
Kaartvedt, Stein

Program
Marine ScienceKAUST Department
Biological and Environmental Science and Engineering (BESE) DivisionDate
2013-12Permanent link to this record
http://hdl.handle.net/10754/306951
Metadata
Show full item recordAbstract
Ocean acidification is predicted to lead to global oceanic decreases in pH of up to 0.3 units within the next 100 years. However, those levels are already being reached currently in coastal regions due to natural CO2 variability. Squid are a vital component of the pelagic ecosystem, holding a unique niche as a highly active predatory invertebrate and major prey stock for upper trophic levels. This study examined the effects of a range of ocean acidification regimes on the early life history of a coastal squid species, the Atlantic longfin squid, Doryteuthis pealeii. Eggs were raised in a flow-through ocean acidification system at CO2 levels ranging from ambient (400ppm) to 2200ppm. Time to hatching, hatching efficiency, and hatchling mantle lengths, yolk sac sizes, and statoliths were all examined to elucidate stress effects. Delays in hatching time of at least a day were seen at exposures above 1300ppm in all trials under controlled conditions. Mantle lengths were significantly reduced at exposures above 1300 ppm. Yolk sac sizes varied between CO2 treatments, but no distinct pattern emerged. Statoliths were increasingly porous and malformed as CO2 exposures increased, and were significantly reduced in surface area at exposures above 1300ppm. Doryteuthis pealeii appears to be able to withstand acidosis stress without major effects up to 1300ppm, but is strongly impacted past that threshold. Since yolk consumption did not vary among treatments, it appears that during its early life stages, D. pealeii reallocates its available energy budget away from somatic growth and system development in order to mitigate the stress of acidosis.Citation
Zakroff, C. J. (2013). CO2-level Dependent Effects of Ocean Acidification on Squid, Doryteuthis pealeii, Early Life History. KAUST Research Repository. https://doi.org/10.25781/KAUST-C7V2Nae974a485f413a2113503eed53cd6c53
10.25781/KAUST-C7V2N