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Marine Ecology Progress Series

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MEPS 510:45-57 (2014)  -  DOI:

Variability in the skeletal mineralogy of temperate bryozoans: the relative influence of environmental and biological factors

Jennifer Loxton1,2,3, Piotr Kuklinski2,4, Jens Najorka2, Mary Spencer Jones2, Joanne S. Porter1,2,*

1Centre for Marine Biodiversity and Biotechnology, School of Life Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK
2Department of Life Sciences Millport, Natural History Museum, London SW7 5BD, UK
3University Marine Biological Station, Millport, Isle of Cumbrae KA28 0EG, UK
4Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland
*Corresponding author:

ABSTRACT: Bryozoans exhibit a highly variable geochemistry within their calcium carbonate skeletons. Previous studies have predominantly attributed this variability to differences in seawater temperature influencing the relative deposition of aragonite and calcite, and the extent of magnesium incorporation into the calcite lattice. However, the patterns and scale of this variability have not been examined in detail. We conducted a high-replicate, multi-site study on the skeletal mineralogy of temperate Northern Hemisphere bryozoans to investigate the range of skeletal aragonite and Mg-calcite variability between species and the relative influence of environmental and biological factors on skeletal biogeochemistry. During a cruise in May 2012 in Scapa Flow, Orkney, Northeast Scotland, 480 specimens from 3 bryozoan species were collected by SCUBA diving. Samples were obtained from 5 study sites with similar depths and physical characteristics. All specimens were collected within the same week and were selected to be of similar size, age and breeding status. The results of X-ray diffraction analysis showed that wt% MgCO3 in calcite and wt% aragonite in total CaCO3 were statistically different between sites for all species. This may be explained by differential population connectivity between sites influenced by the tidal regimes of Scapa Flow. No temperate bryozoan species showed the expected positive trends of increasing wt% MgCO3 in calcite or wt% aragonite in total CaCO3 with seawater temperature. Based on the data generated in this study, we suggest that both environmental and biological factors are involved in the control of skeletal mineralogy in some temperate bryozoan species.

KEY WORDS: Aragonite · Mg-calcite · Paleo-temperature · Magnesium

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Cite this article as: Loxton J, Kuklinski P, Najorka J, Spencer Jones M, Porter JS (2014) Variability in the skeletal mineralogy of temperate bryozoans: the relative influence of environmental and biological factors. Mar Ecol Prog Ser 510:45-57.

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