AB 13:251-262 (2011)  -  doi:10.3354/ab00376

Effects of ocean acidification on growth, organic tissue and protein profile of the Mediterranean ­bryo­zoan Myriapora truncata 

Chiara Lombardi1,*, Silvia Cocito1, Maria Cristina Gambi2, Barbara Cisterna3, Francine Flach3, Paul D. Taylor4, Kim Keltie5, Andrew Freer5, Maggie Cusack

1ENEA Marine Environment Research Centre, PO Box 224, 19100 La Spezia, Italy
2Laboratory of Functional and Evolutionary Ecology, Stazione Zoologica Anton Dohrn, 80121 Naples, Italy
3Laboratory of Cellular Biology and Neurobiology, Department of Animal Biology, University of Pavia, 27100 Pavia, Italy
4Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK
5Glasgow Biomedical Research Centre, University of Glasgow, Glasgow G12 8TA, UK
6School of Geographical & Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK

ABSTRACT: The possible effects of ocean acidification on growth, organic tissue and protein profile in the bryozoan Myriapora truncata (Pallas, 1766) were studied in samples transplanted along a gradient of different pH conditions in an area of natural volcanic CO2 vents at Ischia Island (Tyrrhenian Sea, Italy). Living colonies from normal (mean pH 8.10), intermediate (pH 7.83) and low (pH 7.32) pH sites were investigated after intervals of 34, 57 and 87 d of exposure. M. truncata formed new and complete zooids at the normal site, whereas at the intermediate and low pH sites, neither partial nor complete zooids were produced. After 34 d at intermediate and low pH conditions, the organic cuticle which envelops the skeleton increased in thickness when compared to normal colonies, suggesting a protective role against dissolution of the high-Mg calcite skeleton. Significant changes in the protein profile and expression displayed by samples from intermediate and low pH conditions suggest that M. truncata makes an initial attempt to overcome the decrease in pH by up-regulating protein production but eventually, especially in the lowest pH condition, exhausts biochemical energy to maintain this rate of protein production, leading to eventual death.


KEY WORDS: Ocean acidification · Bryozoa · Organic tissues · Protein · Growth · Mediterranean Sea · ­Myriapora truncata


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Cite this article as: Lombardi C, Cocito S, Gambi MC, Cisterna B and others (2011) Effects of ocean acidification on growth, organic tissue and protein profile of the Mediterranean ­bryo­zoan Myriapora truncata . Aquat Biol 13:251-262

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