Dall Sheep Lamb Recruitment and Climate Data, Alaska and NW Canada, 2000-2015

Annual lamb-to-ewe ratios from 2000 to 2015 across the full range of Dall sheep in Alaska and Northwestern Canada. Sheep population data are from surveys conducted over 14 major mountain ranges, which were divided into 24 mountain units for analysis. The dataset also includes estimated covariate environmental and climate data such as precipitation, temperature, snow cover, elevation, and distance to range center.

Use Cases

• Modeling lamb recruitment rates based on annual climate and environmental covariates
• Analyzing population performance across mountain units based on differing climate gradients
• Examining relationships between snow cover and temperature and sheep population dynamics
• Mapping species range and environmental variables across Alaska and Northwestern Canada

Strengths

• 16-year time series from 2000 to 2015
• Data covers 24 mountain units across 14 major mountain ranges
• Includes multiple environmental covariates: precipitation, temperature, snow cover, elevation, and distance to range center

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Sheep population data from surveys conducted over mountain ranges; climate data likely from remote sensing and environmental models.

Time Range

2000-2015

Freshness

Last updated 2026-03-12 19:37:44.379538; freshness should be verified

Geography

Alaska and Northwestern Canada