MEPS 591:129-139 (2018)  -  DOI: https://doi.org/10.3354/meps12298

ABSTRACT: Eutrophication-induced hypoxia is one of the primary anthropogenic threats to coastal ecosystems. Under hypoxic conditions, a deficit of O₂ and a surplus of CO₂ will concurrently decrease pH, yet studies of hypoxia have seldom considered the potential interactions with elevated pCO₂ (reduced pH). Previous studies on gelatinous organisms concluded that they are fairly robust to low oxygen and reduced pH conditions individually, yet the combination of stressors has only been examined for ephyrae. The goals of this study were to determine the individual and interactive effects of hypoxia and elevated pCO₂ on the asexual reproduction and aerobic respiration rates of polyps of the scyphozoan Aurelia aurita during a manipulative experiment that ran for 36 d. pCO₂ and pO₂ were varied on a diel basis to closely mimic the diel conditions observed in the field. Exposure to low dissolved oxygen (DO) reduced asexual budding of polyps by ~50% relative to control conditions. Under hypoxic conditions, rates of respiration were elevated during an initial acclimation period (until Day 8), but respiration rates did not differ between DO levels under prolonged exposure. There was no significant effect of increased pCO₂ on either asexual reproduction or aerobic respiration, suggesting that elevated pCO₂ (reduced pH) did not exacerbate the negative reproductive effects of hypoxia on A. aurita polyps.

KEY WORDS: Hypoxia · Ocean acidification · Scyphozoan · Aerobic respiration

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Cite this article as: Treible LM, Pitt KA, Klein SG, Condon RH (2018) Exposure to elevated pCO2 does not exacerbate reproductive suppression of Aurelia aurita jellyfish polyps in low oxygen environments. Mar Ecol Prog Ser 591:129-139. https://doi.org/10.3354/meps12298 Export citation Share:    Facebook - - linkedIn