Effects of reduced seawater pH on fertilisation, embryogenes

Details of Research

TitleEffects of reduced seawater pH on fertilisation, embryogenesis and larval development in the Antarctic seastar Odontaster validusAbstractThe effects of ocean acidification will be pronounced in high-latitude marine communities, although little is known on how reproduction in free-spawning polar invertebrates will respond. Using the circum-Antarctic sea star Odontaster validus, we examined fertilisation, larval survival and development under a controlled seawater treatment (temperature = -0. 5 deg C, pH 8. 1, pCO2(aq) = 326. 6 μatm, TA = 2,274. 2 μmol kg soln-1), two near-future pH treatments (pH 7. 8 and 7. 6) and an extreme treatment (pH 7. 0). At a sperm concentration of 3. 5 x 105 sperm ml-1, percentage of fertilisation was 98-90 percent across a pH 8. 1-7. 0 range. At near-future pH ranges (pH 7. 8 and 7. 6), fertilisation was not significantly lower than in the control pH 8. 1 except at the lowest sperm concentration (2. 2 x 103 sperm ml-1) where fertilisation was reduced to 60 and 61 percent in pH 7. 6 and 7. 8, respectively. Larval survival was not significantly affected by a decrease in pH of 0. 3 units, but at pH 7. 6 survival was significantly reduced. This difference was apparent at 9 days, and at the end of the experiment at 58 days, survival was 55 percent compared with 85 percent in the ambient treatment. Near-future changes to pH yielded smaller larvae, a result of both subtle differences in their morphology and slowed development rates, while larvae at pH 7. 0 showed evidence of abnormal development. O. validus fertilisation and larval success declines in seawater pH conditions expected in coastal Antarctica over the coming decades, although the responses observed are within the range observed in warmer-water echinoderms. Copyright 2012 Springer-Verlag Berlin Heidelberg.AcknowledgementsWe thank Antarctica New Zealand for their logistical support in Antarctica, and staff at the Portobello Marine Laboratory, University of Otago. This research was funded by a University of Otago Research Grant. Maria Gonzalez-Bernat was supported by a New Zealand AID scholarship. We disclose no conflicts of interest in regard to this research.

Details

1st AuthorGonzalez-Bernat, M.AuthorGonzalez-Bernat, M.Lamare, M.Barker, M.Year2013JournalPolar BiologyVolume36Number2Pages235-247DOI10.1007/s00300-012-1255-7URLhttps://www.scopus.com/inward/recor.....9beaf652a3366f5bf9b4aaa9aKeywordsexperimental studyfertilization (reproduction)fishlarval developmentpHreproductive behaviorseawaterspawning populationwater chemistry, Southern Ocean, AsteroideaEchinodermataInvertebrataOdontaster validus, rank5Author KeywordsAntarcticaAsteroidFertilisationLarval developmentLarval survivalOcean acidification

Other

TypeArticleCitationGonzalez-Bernat, M., Lamare, M. and Barker, M. (2013). Effects of reduced seawater pH on fertilisation, embryogenesis and larval development in the Antarctic seastar Odontaster validus. Polar Biology, 36(2): 235-247 IdentifierGonzalez-Bernat2013Relevancerank5

Linked To

Author

Lamare, M.