Table 1 Probability distributions used for parameters in cat predation model.
From: The impact of free-ranging domestic cats on wildlife of the United States
Parameter | Number of studies used* | Distribution type | Distribution parameters |
|---|---|---|---|
Owned cats | |||
Number of owned cats in contiguous United States | 2 | Normal | Mean=84 M, s.d.=2.5 M |
Proportion of owned cats with outdoor access | 8 | Uniform | Min=0.4, max=0.7 |
Proportion of outdoor owned cats that hunt | 3 | Uniform | Min=0.5, max=0.8 |
Correction for owned cats not returning prey | 3 | Uniform | Min=1.2, max=3.3 |
BIRD return rate per cat per year | |||
US studies | 4 | Uniform | Min=1.0, max=34.1 |
US and Europe studies | 11 | Uniform | Min=4.2, max=18.3 |
All temperate studies | 17 | Uniform | Min=3.4, max=13.2 |
MAMMAL return rate per cat per year | |||
US studies | 1 | NA† | NA |
US and Europe studies | 7 | Uniform | Min=11.1, max=29.5 |
All temperate studies | 13 | Uniform | Min=8.7, max=21.8 |
REPTILE return rate per cat per year | |||
US studies | 0 | NA | NA |
US and Europe studies | 1 | NA | NA |
All temperate studies | 8 | Uniform | Min=0.4, max=2.21 |
AMPHIBIAN return rate per cat per year | |||
US studies | 0 | NA | NA |
US and Europe studies | 1 | NA | NA |
All temperate studies | 5 | Uniform | Min=0.05, max=0.5 |
Un-owned cats | |||
Number of un-owned cats in contiguous United States | 5 | Uniform | Min=30 M, max=80 M |
Proportion of un-owned cats that hunt | 2 | Uniform | Min=0.8, max=1.0 |
BIRD predation rate per cat per year | |||
US studies | 8 | Uniform | Min=24.4, max=51.4 |
US and Europe studies | 11 | Uniform | Min=23.2, max=46.2 |
All temperate studies | 19 | Uniform | Min=30.0, max=47.6 |
MAMMAL predation rate per cat per year | |||
US studies | 6 | Uniform | Min=162.3, max=354.9 |
US and Europe studies | 7 | Uniform | Min=139.4, max=328.6 |
All temperate studies | 13 | Uniform | Min=177.3, max=299.5 |
REPTILE predation rate per cat per year | |||
US studies | 1 | NA | NA |
US and Europe studies | 2 | NA | NA |
All temperate studies | 10 | Uniform | Min=4.2, max=12.4 |
AMPHIBIAN predation rate per cat per year | |||
US studies | 0 | NA | NA |
US and Europe studies | 0 | NA | NA |
All temperate studies | 3 | Uniform | Min=1.9, max=4.7 |
