Impact of environmental seasonality on stable isotope composition of skeletons of the temperate bryozoan Cellaria sinuosa

Bader, Beate and Schäfer, Priska (2005) Impact of environmental seasonality on stable isotope composition of skeletons of the temperate bryozoan Cellaria sinuosa Palaeogeography, Palaeoclimatology, Palaeoecology, 226 (1-2). pp. 58-71. DOI 10.1016/j.palaeo.2005.05.007.

Full text not available from this repository.

Supplementary data:

Abstract

Stable oxygen and carbon isotopes of skeletons of the anascan bryozoan Cellaria sinuosa (Hassall) from waters off Roscoff (outer British Channel) were studied to obtain information on seasonal changes of the environments monitored in the skeleton of the bryozoan. The isotope signals found in the skeletons cover a time span of three years (1993-1995). [delta]18Oc is incorporated into the skeleton close to isotopic equilibrium, whereas [delta]13C is characterised by distinctly lower values relative to the predicted equilibrium indicating a strong component of respiratory CO2 incorporated into the bryozoan skeleton. [delta]18Oc values document the annual cycle of temperature while [delta]13C shows no clear seasonal cyclicity of primary productivity. The lack of correlation between [delta]18Oc and [delta]13C values in individual profiles, however, monitors the offset between seasonal temperature and phytoplankton cycles. Correspondence of [delta]13C values with the bryozoan life cycle indicates reduced metabolism during reproduction and refers toward a switch of used carbon reservoirs from respiratory CO2 to DIC pool. Cellaria sinuosa shows an age of 1.5 years with an annual growth rate of approximately 32 mm/yr. Carbonate production by C. sinuosa on the shelf off Roscoff varies between 12 gr/m2/yr and 57 gr/m2/yr and lies within the range of cold-water carbonates.

Document Type: Article
Keywords: Bryozoa Stable isotopes Oxygen-18 Carbon-13 Equilibrium Growth rate Cellaria sinuosa
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
DOI etc.: 10.1016/j.palaeo.2005.05.007
ISSN: 0031-0182
Date Deposited: 02 Feb 2012 09:00
Last Modified: 09 Oct 2012 03:56
URI: http://eprints.uni-kiel.de/id/eprint/16037

Actions (login required)

View Item View Item