These datasets contain hydrogen delta values of fur keratin from 6 sedentary
bat species. They correspond to the combination of several studies as detailed
in Voigt & Lenhert 2019. CalibDataBat is the dataset used in Courtiol et al. 2019.
The data can be used as an example to fit a calibration model using the
function calibfit. CalibDataBatRev is the same data but the bat
fur isotope values were corrected to align with the current delta values for deuterium
for keratin reference materials (Soto et al. 2017, https://doi.org/10.1002/rcm.7893)
ensuring comparability between formerly and more recently normalized datasets of delta values for deuterium.
Two dataframes with 335 observations and 7 variables:
| site_ID | (factor) | Identification of the sampling site |
| long | (numeric) | Longitude coordinate (decimal degrees) |
| lat | (numeric) | Latitude coordinate (decimal degrees) |
| elev | (numeric) | Elevation asl (m) |
| sample_ID | (factor) | Identification of the sampled animal |
| species | (factor) | A code for the species |
| sample_value | (numeric) | Hydrogen delta value of the tissue |
Users who wish to use their own dataset for calibration should create a
dataframe of similar structure than these ones (only the column 'species'
can be dropped). The columns should possess the same names as the ones
described above. If the elevation is unknown at the sampling sites, elevation
information can be extracted from a high resolution elevation raster using
the function terra::extract (see Examples in
CalibDataBat2).
Voigt CC & Lehnert L (2019). Tracking of movements of terrestrial mammals using stable isotopes. In Hobson KA & Wassenaar LI (eds.), Tracking Animal Migration with Stable Isotopes, second edition. Academic Press, London.
Courtiol A, Rousset F, Rohwäder M, Soto DX, Lehnert L, Voigt CC, Hobson KA, Wassenaar LI & Kramer-Schadt S (2019). Isoscape computation and inference of spatial origins with mixed models using the R package IsoriX. In Hobson KA & Wassenaar LI (eds.), Tracking Animal Migration with Stable Isotopes, second edition. Academic Press, London.
Soto DX, Koehler G, Wassenaar LI & Hobson KA (2017). Re-evaluation of the hydrogen stable isotopic composition of keratin calibration standards for wildlife and forensic science applications. Rapid Commun Mass Spectrom. 31(14):1193-1203. doi: 10.1002/rcm.7893. PMID: 28475227.
CalibDataBat2 for another (related) calibration dataset
calibfit to fit a calibration model
head(CalibDataBat)
str(CalibDataBat)
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