van de Kerk, M., Verbyla, D., Nolin, A. W., Sivy, K. J., & Prugh, L. R. (2018). ABoVE: Dall Sheep Lamb Recruitment and Climate Data, Alaska and NW Canada, 2000-2015 (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/1640 Date Accessed: 2026-08-12

@article{van de kerk_verbyla_nolin_sivy_prugh_2018, title={ABoVE: Dall Sheep Lamb Recruitment and Climate Data, Alaska and NW Canada, 2000-2015}, url={https://www.earthdata.nasa.gov/data/catalog/ornl-cloud-dall-sheep-population-dynamics-1640-1}, DOI={10.3334/ORNLDAAC/1640}, abstractNote={This dataset contains estimated annual average Dall sheep (Ovis dalli dalli) lamb-to-ewe ratios for each year from 2000-2015 across the full species range in Alaska and Northwestern Canada. Sheep population data are from surveys conducted over the 14 major mountain ranges encompassing the range of Dall sheep. For this study, the mountain ranges were divided into 24 mountain units due to differing climate gradients. Estimated covariate environmental and climate data used to examine the relationship between environmental conditions and Dall sheep population performance (per mountain unit) are also provided and include precipitation, temperature, snow cover, elevation, and distance to the center of the range.}, publisher={ORNL Distributed Active Archive Center}, author={van de Kerk, M. and Verbyla, D. and Nolin, A.W. and Sivy, K.J. and Prugh, L.R.}, year={2018}, language={en}, }

van de Kerk, M., Verbyla, D., Nolin, A. W., Sivy, K. J., & Prugh, L. R. (2018). ABoVE: Dall Sheep Lamb Recruitment and Climate Data, Alaska and NW Canada, 2000-2015 (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/1640 Date Accessed: 2026-08-12

van de Kerk, M., et al. “ABoVE: Dall Sheep Lamb Recruitment and Climate Data, Alaska and NW Canada, 2000-2015.” With ORNL DAAC, Version 1, ORNL Distributed Active Archive Center, 1 Jan. 2018, https://doi.org/10.3334/ORNLDAAC/1640. Date Accessed: 2026-08-12