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Stable hydrogen isotope analysis of bat hair as evidence for seasonal molt and long-distance migration

Journal of Mammalogy

By:
, , , , and
https://doi.org/10.1644/BRG-202

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Abstract

Although hoary bats (Lasiurus cinereus) are presumed to be migratory and capable of long-distance dispersal, traditional marking techniques have failed to provide direct evidence of migratory movements by individuals. We measured the stable hydrogen isotope ratios of bat hair (δDh) and determined how these values relate to stable hydrogen isotope ratios of precipitation (δDp). Our results indicate that the major assumptions of stable isotope migration studies hold true for hoary bats and that the methodology provides a viable means of determining their migratory movements. We present evidence that a single annual molt occurs in L. cinereus prior to migration and that there is a strong relationship between δDh and δDp during the molt period. This presumably reflects the incorporation of local δDp into newly grown hair. Furthermore, we present evidence that individual hoary bats are capable of traveling distances in excess of 2,000 km and that hair is grown at a wide range of latitudes and elevations. Stable hydrogen isotope analysis offers a promising new tool for the study of bat migration.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Stable hydrogen isotope analysis of bat hair as evidence for seasonal molt and long-distance migration
Series title:
Journal of Mammalogy
DOI:
10.1644/BRG-202
Volume:
85
Issue:
5
Year Published:
2004
Language:
English
Publisher:
American Society of Mammalogists
Contributing office(s):
Fort Collins Science Center
Description:
7 p.
First page:
995
Last page:
1001