Pbear {popdemo}

Polar bear matrices

Description

Matrix projection model for the polar bear Ursus maritimus, with 5 matrices corresponding to years 2001-2005. The matrices are based on a population in the southern Beaufort Sea. During 2001-2003, ice conditions were classified as "good", but in 2004-2005, ice conditions were classified as "poor". Poor ice conditions lead to worse population performance. Stages are based on age and reproductive status:
Stage-1: 2-year-old
Stage 2: 3-year-old
Stage 3: 4-year-old
Stage 4: adult (5+ years old), available to breed
Stage 5: adult, with cub (0-1 years old)
Stage 6: adult, with yearling (1-2 years old).

Usage

data(Pbear)

Format

List object containing matrices.

Details

The population structure is c(0.106, 0.068, 0.106, 0.461, 0.151, 0.108))

References

• Hunter et al. (2010) Ecology, 91, 2883-2897.

Examples

  #read in data
  data(Pbear)
  Pbear