Jökull - 01.12.2006, Blaðsíða 39

The stable isotopic (C and N) composition of modern plants and lichens from northern Iceland
Robbins, C. T., G. V. Hilderbrand and S. D. Farley 2002.
Incorporating concentration dependence in stable
isotope mixing models: a response to Phillips and
Koch (2002). Oecologia 133, 10–13.
Robinson, D. 2001. Delta N-15 as an integrator of the
nitrogen cycle. Trends in Ecology and Evolution 16,
153–162.
Rundgren, M. 1998. Early-Holocene vegetation of
northern Iceland: pollen and plant macrofossil
evidence from the Skagi peninsula. Holocene 8, 553–
564.
Sage, R. F., D. A. Wedin and M. Li 1999. The
biogeography of C4 photosynthesis: Patterns and
controlling factors. In: C4 Plant Biology, R. F. Sage
and R. K. Monson (Eds.) Academic Press.
Schelske, C. L. and D. A. Hodell 1991. Recent Changes
in Productivity and Climate of Lake-Ontario Detected
by Isotopic Analysis of Sediments. Limnology and
Oceanography 36, 961–975.
Simpson, I. A., W. P. Adderley, G. Guthmundsson, M.
Hallsdottir, M. A. Sigurgeirsson and M. Snaesdottir
2002. Soil limitations to Agrarian land production in
premodern Iceland. Human Ecology 30, 423443.
Tozer, W. C., D. Hackell, D. B. Miers and W. B. Silvester
2005. Extreme isotopic depletion of nitrogen in New
Zealand lithophytes and epiphytes; the result of
diffusive uptake of atmospheric ammonia? Oecologia,
144, 628–635.
Ward, J. K., D. T. Tissue, R. B. Thomas and B. R. Strain
1999. Comparative responses of model C3 and C4
plants to drought in low and elevated CO2. Global
Change Biology 5, 857–867.
Wetzel, R. G. 1983. Limnology, Saunders College
Publishing, 767 pp.
Wooller, M., B. Smallwood, U. Scharler, M. Jacobson and
M. Fogel 2003. A taphonomic study of delta C-13 and
delta N-15 values in Rhizophora mangle leaves for
a multi-proxy approach to mangrove palaeoecology.
Organic Geochemistry 34, 1259–1275.
Wooller, M., B. Johnson, A. Wilkie and M. Fogel 2005.
Stable isotope characteristics across narrow savan-
na/woodland ecostones in Wolfe Creek Meteorite Cra-
ter, Western Australia. Oecologia, 145, 100–112.
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