12. Assessing Ecosystem-Level Water Relations Through Stable Isotope Ratio Analyses
195
existed between the 0 18 0 values of source water
and bone phosphate. Ecological applications have
included studies of the distribution of white-tailed
deer across North America (Luz et al. 1990). Similar approaches have been used to show that the oD
values of bone phosphate and bone gelatin also reflect source waters (Cormie et al. 1994). More recently, Hobson and Wassenaar (1997) have shown
that the oD and 0 18 0 values of bird feathers also
reflect that of their source water, which has far
reaching implications for tracing long-distance bird
migrations (see Figure 12.6). While many migratory animals, such as insects, lack bones, they too
record long-term information about the source water of the ecosystem in which they were reared.
Hobson et al. (1999) have shown that it is feasible
to trace the migratory origins of monarch butterflies
from the oD and 0 18 0 values of the organic matter
in their wings. Further exploration of this approach
is likely to have widespread ecosystem-level applications in cases in which animals move back and
forth between adjacent ecosystems.
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