Abstract
The cheilostome bryozoan Pentapora, an important benthic carbonate producer on non-tropical continental shelves, displays seasonal variations in deposition of the calcareous skeleton reflected by ‘winter’ and ‘summer’ growth bands. Studies on colonies from Atlantic and Mediterranean localities show that the ratio of the heights of these growth bands correlates significantly with mean annual range of temperature (MART) and mean annual temperature (MAT). The locality with the lowest MART and MAT showed the greatest wt% of calcite in the winter growth band. The opposite was true for the locality with the highest MART and MAT. Carbonate standing stock and carbonate production estimated for Atlantic localities were an order of magnitude lower than those measured at Mediterranean localities. Variability in skeletal carbonate depositional pattern and mineralogy suggests that fossil and historical collections of Pentapora may be useful indicators of past thermal conditions.
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Acknowledgments
We thank S. Tompsett, S. Sharrock and Seasearch Devon, Plymouth Sound Branch of the BSAC, and Aquanauts Diving for their support in the field and help in collecting specimens. We are especially grateful to Dr. D. Bonnet (Plymouth Marine Laboratory, Plymouth, UK) for providing temperature data, and Dr. G. Calzetta (EcoX laboratory) for X-ray analysis. The manuscript has been improved by constructive criticism made by Björn Berning on an earlier version. The work was supported financially by the ‘Experimental Ecology and Geobotany’ Ph.D. programme, University of Pavia.
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Lombardi, C., Cocito, S., Hiscock, K. et al. Influence of seawater temperature on growth bands, mineralogy and carbonate production in a bioconstructional bryozoan. Facies 54, 333–342 (2008). https://doi.org/10.1007/s10347-008-0143-7
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DOI: https://doi.org/10.1007/s10347-008-0143-7