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

Bryozoan stable carbon and hydrogen isotopes: relationships between the isotopic composition of zooids, statoblasts and lake water
Bryozoan stable carbon and hydrogen isotopes: relationships between the isotopic composition of zooids, statoblasts and lake water
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.
0018-8158
209-223
Van Hardenbroek, M.
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Leuenberger, M.
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Hartikainen, H.
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Okamura, B.
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Heiri, O.
21199b62-05e6-48ca-ac1e-a4665e7e6801
Van Hardenbroek, M.
7ddff57e-78f7-444a-a3fc-946ef7f7bbfc
Leuenberger, M.
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Hartikainen, H.
a34a190f-4020-49b5-a87e-5bce7df525e8
Okamura, B.
5cd120ed-3b5c-40a0-81d6-95442f7b2a03
Heiri, O.
21199b62-05e6-48ca-ac1e-a4665e7e6801

Van Hardenbroek, M., Leuenberger, M., Hartikainen, H., Okamura, B. and Heiri, O. (2016) Bryozoan stable carbon and hydrogen isotopes: relationships between the isotopic composition of zooids, statoblasts and lake water. Hydrobiologia, 765 (1), 209-223. (doi:10.1007/s10750-015-2414-y).

Record type: Article

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.

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van Hardenbroek et al 2016 CH isotopes Bryozoa.pdf - Version of Record
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Accepted/In Press date: 20 July 2015
e-pub ahead of print date: 29 July 2015
Published date: February 2016
Organisations: Palaeoenvironment Laboratory (PLUS)

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Local EPrints ID: 396768
URI: http://eprints.soton.ac.uk/id/eprint/396768
ISSN: 0018-8158
PURE UUID: a306da91-40ee-401d-992d-df4e184fae6e

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Date deposited: 14 Jun 2016 08:52
Last modified: 15 Mar 2024 00:59

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Contributors

Author: M. Van Hardenbroek
Author: M. Leuenberger
Author: H. Hartikainen
Author: B. Okamura
Author: O. Heiri

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