期刊
GEOCHIMICA ET COSMOCHIMICA ACTA
卷 71, 期 13, 页码 3302-3310出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.gca.2007.05.002
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资金
- NERC [NE/D001501/1] Funding Source: UKRI
- Natural Environment Research Council [NE/D001501/1] Funding Source: researchfish
Stable isotopes of faeces contain information related to the animals feeding ecology. The use of stable isotope values from subfossil faeces as a palaeoenvironmental indicator depends on how faithfully the animal records their local environment. Here we present insectivorous bat guano delta C-13 and delta N-15 values from a precipitation gradient across the southern United States and northern Mexico to compare with local vegetation and climate. We find delta C-13 values to be an excellent predictor of expected C-4/CAM vegetation, indicating that the bats are non-selective in their diet. Moreover, we find bat guano delta C-13 values to be strongly correlated with summer precipitation amount and winter precipitation ratio. We also find evidence for a significant relationship with mean annual temperature. In general, we do not find delta N-15 values to be related to any parameters along the climatic gradient we examined. Additionally, we measured delta C-13 and delta N-15 values of bulk guano deposited annually from 1968 to 1987 in a varved guano deposit at Eagle Creek Cave, Arizona. Neither delta C-13 nor delta N-15 values were significantly related to various local meteorological variables; however, we found delta C-13 values of guano to be significantly related to drought and to the North American Monsoon indicating bat guano delta C-13 values preserve an interpretable record of large-scale atmospheric variability. (c) 2007 Elsevier Ltd. All rights reserved.
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