Hydrobiologia

, Volume 765, Issue 1, pp 209–223 | Cite as

Bryozoan stable carbon and hydrogen isotopes: relationships between the isotopic composition of zooids, statoblasts and lake water

  • M. van Hardenbroek
  • M. Leuenberger
  • H. Hartikainen
  • B. Okamura
  • O. Heiri
Primary Research Paper

Abstract

We explored the extent to which δ13C and δD values of freshwater bryozoan statoblasts can provide information about the isotopic composition of zooids, bryozoan food and surrounding water. Bryozoan samples were collected from 23 sites and encompassed ranges of nearly 30‰ for δ13C and 100‰ for δD values. δ13C offsets between zooids and statoblasts generally ranged from −3 to +4.5‰, with larger offsets observed in four samples. However, a laboratory study with Plumatella emarginata and Lophopus crystallinus demonstrated that, in controlled settings, zooids had only 0–1.2‰ higher δ13C values than statoblasts, and 1.7‰ higher values than their food. At our field sites, we observed a strong positive correlation between median δ13C values of zooids and median δ13C values of corresponding statoblasts. We also observed a positive correlation between median δD values of zooids and statoblasts for Plumatella, and a positive correlation between median δD values of statoblasts and δD values of lake water for Plumatella and when all bryozoan taxa were examined together. Our results suggest that isotope measurements on statoblasts collected from flotsam or sediment samples can provide information on the feeding ecology of bryozoans and the H isotopic composition of lake water.

Keywords

Freshwater Bryozoa Stable isotopes Statoblasts Lakes Feeding ecology Palaeoecology 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Institute of Plant Sciences and Oeschger Centre for Climate Change ResearchUniversity of BernBernSwitzerland
  2. 2.Geography and EnvironmentUniversity of SouthamptonSouthamptonUK
  3. 3.Physics Institute and Oeschger Centre for Climate Change ResearchUniversity of BernBernSwitzerland
  4. 4.Department of Life SciencesNatural History MuseumLondonUK
  5. 5.EAWAG, Department of Aquatic Ecology and ETH-ZurichInstitute of Integrative Biology (IBZ)DübendorfSwitzerland

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