The latest Devonian negative shift in the terrestrial organic carbon isotope ratio
, followed by the early Carboniferous positive trend, was reported by Strauss & Peters-Kottig (2003).
Infant and child diet in Neolithic hunter-fisher-gatherers from Cis-Baikal, Siberia: Intra-long bone stable nitrogen and carbon isotope ratios
. American Journal of Physical Anthropology 146(2):225-241.
Carbon Isotope Ratios--The leaves that we used to measure leaf mass per area we also used to determine leaf carbon isotope ratios
. We combined leaves from one tree into one sample, placed the sample in a mortar, and ground it until a homogenous mixture was formed.
A Mann-Whitney U test performed only for data of these two prey species revealed a highly significant difference in their stable carbon isotope ratios
(U = 0.0, P < 0.001), supporting our notion of a bimodal distribution in consumer stable carbon isotope ratios
Summary statistics for stable carbon isotope ratio
([[delta].sup.13]C) chronologies by site.
The data of gravimetry as well as carbon isotope ratios
were analyzed for their statistical significance among the genotypes following a completely randomized design by MSTATC software (Anonymous, 1989).
Mooney HA, Bullock SH, Ehleringer JR (1989) Carbon isotope ratios
of plants of a tropical dry forest in Mexico.
Ehleringer JR, Lin Z-F, Field CB, Sun GC, Kuo C-Y (1987) Leaf carbon isotope ratios
from a subtropical monsoon forest.
Hydrogen and carbon isotope ratios
of selected species of a Mediterranean macchia ecosystem.
The more sugar-sweetened beverages an individual consumes, the greater alanine's carbon isotope ratio
The carbon isotope ratio
of a sample was determined as described in Eq.
Each organism has its own, measurable carbon isotope ratio
, or signature, which remains recognizable through chewing, convesion to animal tissue and on up the food chain.