Predicting animal delta 18O: Accounting for diet and physiological adaptation

Details Predicting animal delta 18O: Accounting for diet and physiological adaptation Predicting animal delta 18O: Accounting for diet and physiological adaptation

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60.4811k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 60, Issue 23, pp.4811-4829

Mathematics

Logic

19

Scientific paper

Theoretical predictions and measured isotope variations indicate that diet and physiological adaptation have a significant impact on animals 18 O and cannot be ignored. A generalized model is therefore developed for the prediction of animal body water and phosphate 18 O to incorporate these factors quantitatively. Application of the model reproduces most published compositions and compositional trends for mammals and birds. A moderate dependence of animal 18 O on humidity is predicted for drought-tolerant animals, and the correlation between humidity and North American deer bone composition as corrected for local meteoric water is predicted within the scatter of the data. In contrast to an observed strong correlation between kangaroo 18 O and humidity ( 18 O/ h ~ 2.5 ± 0.4 /10% r.h.), the predicted humidity dependence is only 1.3 - 1.7 /10% r.h., and it is inferred that drinking water in hot dry areas of Australia is enriched in 18 O over rainwater. Differences in physiology and water turnover readily explain the observed differences in 18 O for several herbivore genera in East Africa, excepting antelopes. Antelope models are more sensitive to biological fractionations, and adjustments to the flux of transcutaneous water vapor within experimentally measured ranges allows their 18 O values to be matched. Models of the seasonal changes of forage composition for two regions with dissimilar climates show that significant seasonal variations in animal isotope composition are expected, and that animals with different physiologies and diets track climate differently. Analysis of different genera with disparate sensitivities to surface water and humidity will allow the most accurate quantification of past climate changes.

Affiliated with

Also associated with

No associations

Rating

Predicting animal delta 18O: Accounting for diet and physiological adaptation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Predicting animal delta 18O: Accounting for diet and physiological adaptation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Predicting animal delta 18O: Accounting for diet and physiological adaptation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1500227