CEOS_EXTRA compiled data on female brown bear (Ursus arctos) reproductive rates from 20 study areas in Sweden, Alaska, Canada, and the continental United States. The dataset includes 4,726 radiocollared years of observation for bears over 3 years old, with 482 years for bears over 20. The analysis, last updated in 1999, models age-specific litter production probability to examine maturation and senescence patterns.
Use Cases
- Modeling age-specific reproductive probability curves based on pooled observations from multiple regions.
- Studying reproductive senescence in large mammals based on data for bears over 20 years of age.
- Comparing contemporary bear population age structures to theoretical, unhunted populations.
- Assessing assumptions and biases in wildlife data collection relative to model fitting.
Strengths
- Pooled data from 20 distinct study areas across four countries/regions.
- Includes 4,726 radiocollared years of observation, with 482 years specifically for bears over age 20.
- Model results were validated against the expected reproductive cycle of a litter every 3 years (0.333).
Limitations
- Last updated 1999-12-31 23:59:59.999000; freshness should be verified.
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
Provenance
- Source
- CEOS_EXTRA via NASA Earthdata
- Collection Method
- Combined data from 20 study areas; reproductive performance assessed from radiocollared years.
- Time Range
- null
- Freshness
- 1999-12-31 23:59:59.999000
- Geography
- Sweden, Alaska, Canada, and the continental United States