Abstract
The relationship between seasonal changes in temperature and the size of zooids within cheilostome bryozoans is explored by comparing zooid size and contemporaneous carbonate mineralogy within a single colony of a perennial species that grew in a highly seasonal environment. Previously published oxygen isotope profile data from two fronds of a large colony of Pentapora foliacea from the Irish Sea record the cyclical patterns related to seasonal changes in temperature experienced by the colony over 3 years of growth. Zooid size data gathered from the same points at which the oxygen isotope data were taken reveal that zooid size and contemporaneous δ18O values covary. These and previously published data show that zooid size profiling can be confidently used to easily estimate rates of growth and longevity of bryozoan colonies, and further illustrate the negative relationship between zooid size and ambient temperature. Some inconsistencies in timing between zooid size and δ18O data may provide insights into the mechanisms behind temperature mediated body size changes in poikilothermic animals.
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Acknowledgements
I would like to acknowledge M. Kunz, H. Ristedt, J. Pätzold and G. Wefer for loaning the specimens for analysis. I would also like to thank those who were acknowledged by the authors of the original isotope paper for their help; thus, P. Hayward collected the colony of Pentapora and H. Erlenkeuser, H. Willkomm and H. Cordt made the isotope measurements. M. Kirby made comments on the manuscript. This research was supported by the Smithsonian Marine Sciences Network and the Smithsonian Tropical Research Institute.
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Communicated by P. W. Sammarco, Chauvin
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O’Dea, A. Zooid size parallels contemporaneous oxygen isotopes in a large colony of Pentapora foliacea (Bryozoa). Marine Biology 146, 1075–1081 (2005). https://doi.org/10.1007/s00227-004-1523-3
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DOI: https://doi.org/10.1007/s00227-004-1523-3