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Expanding evaluation of ocean acidification responses in a marine gadid: elevated CO2 impacts development, but not size of larval walleye pollock

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Abstract

Responses of marine populations to climate conditions reflect the integration of a suite of complex and interrelated physiological and behavioral responses at the individual level. Many of these responses are not immediately reflected in changes to survival, but may impact growth or survival at later life stages. Understanding the broad range of impacts of rising CO2 concentrations on marine fishes is critical to predicting the consequences of ongoing ocean acidification. Walleye pollock (Gadus chalcogrammus) support the largest single-species fishery in the world and provide a critical forage base throughout north Pacific ecosystems. Previous studies of high CO2 effects on early life stages of walleye pollock have suggested a general resiliency in this species, but those studies focused primarily on growth and survival rates. Here, we expand on earlier studies with an independent experiment focused on walleye pollock larval development, swimming behavior, and lipid composition from fertilization to 4 weeks post-hatch at ambient (~ 425 µatm) and elevated (~ 1230 µatm) CO2 levels. Consistent with previous observations, size metrics of walleye pollock were generally insensitive to CO2 treatment. However, 4-week post-hatch larvae had significantly reduced rates of swim bladder inflation. A modest change in the swimming behavior of post-feeding larvae was observed at four, but not at 2 weeks post-hatch. Although there were no differences in overall lipid levels between CO2 treatments, the ratio of energy storage lipids (triacylglycerols) to structural membrane lipids (sterols) was lower among larvae reared at high CO2 levels. Although we observed higher survival to 4 weeks post-hatch among fish reared at high CO2 levels, the observations of reduced swim bladder inflation rates and changes in lipid cycling suggest the presence of sub-lethal effects of acidification that may carry over and manifest in later life stages. These observations support the continued need to evaluate the impacts of ocean acidification on marine fishes across a wide range of traits and life stages with replicated, independent experiments.

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Data availability

All data from this project will be made publicly available through NOAA’s National Centers for Environmental Information at https://www.nodc.noaa.gov/oads/stewardship/data_assets.html.

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Acknowledgments

The authors thank S. Haines, P. Iseri, and M. Ottmar for assistance with laboratory culture. C. Magel and N. Monacci assisted with the CO2 dosing system and seawater chemical analyses. M. Spencer assisted with larval behavior observations. C. Salant assisted with lipid sample processing and extractions. C. Murray and C. Norrie provided valuable comments on earlier versions of this manuscript. Reference to trade names does not imply endorsement by the National Marine Fisheries Service. The findings and conclusions in this paper are those of the authors and do not necessarily represent the views of the National Marine Fisheries Service.

Funding

This work was supported by a grant to TPH from NOAA’s Ocean Acidification Program.

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Contributions

TPH, LAC, and MLK designed the experiment. All authors collected the data. TPH, LAC, JFA and MS analyzed the data. TPH led manuscript preparation with contributions from LAC, JFA, and MLK. All authors reviewed, edited, and approved the manuscript for submission.

Corresponding author

Correspondence to Thomas P. Hurst.

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Conflicts of interest

The authors have no conflicts of interest.

Ethical approval

This research was carried out in accordance with all applicable institutional and national guidelines at the time that the study was conducted. Ethical review and approval was not required for the animal study because this experiment was conducted in NOAA’s Alaska Fisheries Science Center Laboratory in Newport, Oregon. NOAA National Marine Fisheries Service does not have an Institutional Animal Care and Use Committee (IACUC) approval processes for research on fishes. All work followed American Fisheries Society policies on the Guidelines for Use of Fishes in Research (https://fisheries.org/docs/policy_useoffishes.pdf) and AVMA (American Veterinary Medical Association) Guidelines on Euthanasia (https://olaw.nih.gov/sites/default/ files/Euthanasia2007.pdf).

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Hurst, T.P., Copeman, L.A., Andrade, J.F. et al. Expanding evaluation of ocean acidification responses in a marine gadid: elevated CO2 impacts development, but not size of larval walleye pollock. Mar Biol 168, 119 (2021). https://doi.org/10.1007/s00227-021-03924-w

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  • DOI: https://doi.org/10.1007/s00227-021-03924-w

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