Title

Abundance and Demography of Prey Populations in the Snake River birds of Prey Area

Document Type

NCA Publications/Reports

Publication Date

1-1-1983

Page Numbers

16-35

Abstract

We trapped 171 ground squirrels (Spermophilus townsendi) in 1983 on a 7.84-ha grid that overlaid the traditional 1-ha Comparison site. Trapping data showed that a 20-m trap interval was more useful for examining aminal movements than the 40-m interval used in 1982. Squirrel density on the inner 1-ha traditional site was similar to 1982 at 10.27 squirrels per hectare.

Black-tailed jack rapit (Lepus californicus) densities varied from 0.07 to 0.32 rabbits per hectare depending on the cover type. These values are similar to 1982 and show a stabilization in the sharp decline recorded after 1981.

The livestock exclosures, fire transect lines, and fire study plots were sampled in 1983. Three new fire plot pairs were established as controls to supplement the fire study plots.

Comments

SRBP Research Project Annual Report, DOI, BLM, Boise District, Boise, ID

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Abundance and Demography of Prey Populations in the Snake River birds of Prey Area

We trapped 171 ground squirrels (Spermophilus townsendi) in 1983 on a 7.84-ha grid that overlaid the traditional 1-ha Comparison site. Trapping data showed that a 20-m trap interval was more useful for examining aminal movements than the 40-m interval used in 1982. Squirrel density on the inner 1-ha traditional site was similar to 1982 at 10.27 squirrels per hectare.

Black-tailed jack rapit (Lepus californicus) densities varied from 0.07 to 0.32 rabbits per hectare depending on the cover type. These values are similar to 1982 and show a stabilization in the sharp decline recorded after 1981.

The livestock exclosures, fire transect lines, and fire study plots were sampled in 1983. Three new fire plot pairs were established as controls to supplement the fire study plots.