Marine Biology

, Volume 157, Issue 12, pp 2689–2702 | Cite as

The response of two ecologically important Antarctic invertebrates (Sterechinus neumayeri and Parborlasia corrugatus) to reduced seawater pH: effects on fertilisation and embryonic development

  • Jessica A. Ericson
  • Miles D. Lamare
  • Simon A. Morley
  • Mike F. Barker
Original Paper

Abstract

Ocean acidification, or the lowering of seawater pH, is caused by sequestration of atmospheric CO2 into the oceans. This study investigated the effects of present-day pH 8.0, predicted ocean surface pH for the years 2100 and 2300 (pH 7.7 and pH 7.3, respectively) and an extreme pH (pH 7.0) on fertilisation and embryogenesis in the Antarctic nemertean worm Parborlasia corrugatus and sea urchin Sterechinus neumayeri. Fertilisation success was not affected by pH in P. corrugatus across a range of sperm concentrations. Fertilisation success in S. neumayeri declined significantly in pH 7.0 and 7.3 seawater, but only at a low sperm concentration. Seawater pH had no effect on the rate of egg cleavage in S. neumayeri, or the proportion of abnormal embryos 1-day post-fertilisation. P. corrugatus embryogenesis was also relatively robust to pH changes, with a significant effect detected only when the seawater pH was decreased to 7.0. While fertilisation and early cell division were relatively robust, later development through to the gastrula was sensitive to pH. In S. neumayeri, an effect of pH on development was evident by the gastrula stage, while there were significantly more abnormal P. corrugatus embryos in pH 7.0 up to the blastula stage, and in pH 7.0 and pH 7.3 at the coeloblastula stage. Our results are similar to the observations on other marine invertebrate species where fertilisation and early embryonic development are generally robust to lowered seawater pH, while the older coeloblastula and gastrula stages are more responsive. We also found no evidence to suggest that Antarctic species are more adversely affected by lower seawater pH compared with the findings for non-Antarctic counterparts. We conclude that in the two species we examined, near-future decreases in pH (decreases of ≈0.3–0.5 pH units) may not have a significant effect on fertilisation and early embryogenesis, while predicted longer term decreases (decreases of ≈0.7–0.77 pH units) could reduce fertilisation success in S. neumayeri if sperm concentrations are low and may increase abnormalities in P. corrugatus during later embryogenesis.

Notes

Acknowledgments

We thank the 2009 staff at Scott Base and Antarctica New Zealand for logistical support, USAP divers for collecting animals, Todd Beaumont and Amanda Bates for their assistance in Antarctica during this project. Also thanks to Brian Niven and Austina Clark for help with statistical analysis, and Christina McGraw for advice on seawater chemistry. This research was funded by a University of Otago Research Grant. Jessica Ericson was awarded a University of Otago Postgraduate Division of Sciences Award, which supported her research activities. Simon Morley was also funded by the UK NERC British Antarctic Surveys Polar Science for Planet Earth and the TransAntarctic Association.

Supplementary material

227_2010_1529_MOESM1_ESM.docx (13 kb)
Supplementary material 1 (DOCX 82 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Jessica A. Ericson
    • 1
  • Miles D. Lamare
    • 1
  • Simon A. Morley
    • 2
  • Mike F. Barker
    • 1
  1. 1.Department of Marine ScienceUniversity of OtagoDunedinNew Zealand
  2. 2.British Antarctic Survey, NERCCambridgeUK

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