0000-0001-7279-715X© Springer International Publishing Switzerland 2015.  The attached document is the authors' final accepted version of the journal article. You are advised to consult the publisher's version if you wish to cite from it

Hartikainen, H

Heiri, O

Leuenberger, M

Okamura, B

van Hardenbroek, M

Hydrobiologia

We explored the extent to which delta C-13 and delta D 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 30aEuro degrees for delta C-13 and 100aEuro degrees for delta D values. delta C-13 offsets between zooids and statoblasts generally ranged from -3 to +4.5aEuro degrees, 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 0-1.2aEuro degrees higher delta C-13 values than statoblasts, and 1.7aEuro degrees higher values than their food. At our field sites, we observed a strong positive correlation between median delta C-13 values of zooids and median delta C-13 values of corresponding statoblasts. We also observed a positive correlation between median delta D values of zooids and statoblasts for Plumatella, and a positive correlation between median delta D values of statoblasts and delta D 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

van Hardenbroek, M.

Leuenberger, M.

Hartikainen, H.

Okamura, B.

Heiri, O.

edoc

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

0000-0001-7279-715X© Springer International Publishing Switzerland 2015.  The attached document is the authors' final accepted version of the journal article. You are advised to consult the publisher's version if you wish to cite from it.NHM Repositor

Natural History Museum Repository

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

Van Hardenbroek, M.

Southampton (e-Prints Soton)

M. van Hardenbroek

M. Leuenberger

H. Hartikainen

B. Okamura

O. Heiri

Crossref

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

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

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Southampton (e-Prints Soton)

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