Abstract
Potential consequences for species distribution, abundances and diversity and their imprint in food chains and ecosystems call for more studies of the short and long term impacts of ocean acidification. Bryozoans have been overlooked in this respect even though they play an important role in benthic temperate ecosystems. Flustra foliacea colonies from the North and Baltic Seas were used to assess morphology, growth rates, wall structure and preservation aiming to build up a baseline to use this species as a ‘sentinel’ of acidification levels. Though no significant differences in mean zooid size among the studied basins were found, North Sea colonies show periodic oscillations across generations in mean frontal area index and zooid density. Preliminary geochemistry analyzes show: (1) similar carbon contents (TC, TIC, TOC) in both basins; (2) skeletal walls composed of IMC; (3) over 50% weight loss in dissolution experiments during the first hour. A winter growth stop marked by growth-check lines is postulated. In order to obtain calibrated results, we need experimental data, and moreover, access to collections done over the past 200 years.
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Acknowledgements
We thank all that helped making this paper a better one. P. Fiedler (IfG, Institute of Geosciences, Kiel University) for the XRD analyses, I. Dold (IfG) for the carbon analyses (Coulomat). U. Schuldt provided invaluable support with the SEM. A special word of thanks is due to W. Blaschek (Pharmaceutical Institute, University Kiel) in whose laboratory the muffle oven analyzes were conducted. This paper benefited from discussions with several colleagues (A. O’Dea, B. Okamura, A. Smith) as well as the suggestions of F. Bitschofsky and D. Barnes who kindly served as reviewers. This work is part of the Excellence Cluster “Future Ocean” project 2009/1 CP0924.
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Fortunato, H., Schäfer, P., Blaschek, H. (2013). Growth Rates, Age Determination, and Calcification Levels in Flustra foliacea (L.) (Bryozoa: Cheilostomata): Preliminary Assessment. In: Ernst, A., Schäfer, P., Scholz, J. (eds) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16411-8_5
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