Name: Jacqueline Krause-Nehring (ESSReS PhD student)
PhD-project title: Ecosystem and climate: decadal pattern and spatio-temporal time series analysis
Organisms that grow permanent hard body parts which persist beyond the organism’s lifetime, are potential “biorecorders”. These hard parts, e.g. mollusk shells, record the ambient environmental conditions throughout the organism´s life-span. In the terrestrial system, trees (dendrochronology) are used as such archives. Likewise calcium carbonate parts of corals, mollusks, and finfish record conditions in the marine environment (sclerochronology). Both morphological and biogeochemical parameters of carbonate structures can be correlated with environmental conditions of aquatic ecosystems.
This project focuses on Arctica islandica, the longest lived marine invertebrate known so far which has been reported to live up to > 400 years. In order to examine the suitability of Arctica islandica as a “biorecorder” I will compare increment morphology and biogeochemical parameters in space and time.
One aim of this study is to link shell growth of Arctica islandica to local and regional ecosystem and climate conditions in the North Sea by building a master chronology for time series analysis. In order to examine a possible correlation between Arctica islandica shell morphology and the primary production of the North Sea, I intend to combine chlorophyll measuremts from Helgoland (since1890) and my increment data.
A second aim is to reconstruct environmental history by profiling trace elements and/or stable isotopes along the growth trajectory of the shells, e.g. Barium as an indicator for primary production and lead to assess the anthropogenic pollution of he North Sea.
Start of doctoral thesis: 01.10.2008 | Defence: 19.12.2011
Supervisor: Prof. Dr. Thomas Brey
Co- Supervisor: Prof. Dr. G. Lohmann (AWI)
Dr. A. Klügel (Bremen University)
Jacqueline Krause-Nehring, J. M. Stark, and A.R. Palmer: Juvenile colour polymorphism in the red rock crab, Cancer productus: Patterns, causes, and possible adaptive significance, Zoology, 2010 (in press).
Jacqueline Krause-Nehring, Klügel, A., Nehrke, G., Kriews, M., Lohmann, G., Theopold, F., Bisling, P., Brey, T., 2009.The significance of the long lived (> 400 years) bivalve Arctica islandica as a high resolution bioarchive. 1st ESSReS annual retreat, Bremerhaven, 2009. (poster)
Jacqueline Krause-Nehring, Nehrke, G., Kriews, P., Klügel, A., Brey, T., 2009. Does the organic matrix constrain the application of trace element proxies in bivalve shells? AGU Fall Meeting, San Francisco, USA, 2009. AGU Fall Meeting, December 14 till 18, 2009 (poster)
Jacqueline Krause-Nehring, Brey, T., Klügel, A., and Nehrke, G. Bleaching of biogenic carbonates: beware of changes in trace element concentrations! 2nd International Sclerochronology Conference (ISC2010), Mainz, Germany, July 24 till 28, 2010.
Peter Bisling, Theopold, F., Krause-Nehring, J., and Brey, T. First results on lead in Arctica islandica shells using laser ablation and resonance ionization. 2nd International Sclerochronology Conference (ISC2010), Mainz, Germany, July 24 till 28, 2010.
Felix Theopold, Bisling, P., Brey, T., and Krause-Nehring, J. A novel approach for the determination of growth increments of Arctica islandica. 2nd International Sclerochronology Conference (ISC2010), Mainz, Germany, July 24 till 28, 2010.
Svalbard, April/May 2009: EPOCA - European Project on Ocean Acidification October 2009: Parasound training cruise on "RV Polarstern"
DAAD stipend from 15 April until 30 June 2010 for a research stay at the Woods Hole Oceanographic Institution (WHOI), Boston University of Massachusetts, USA.