Cholinesterase-Inhibiting Pesticides Vulnerability Index

1. Primary dietary preference
10—Terrestrial vegetation
8—Terrestrial invertebrates
6—Predator or scavenger of terrestrial vertebrates
4—Both aquatic and terrestrial plants and animals
1—Aquatic plants and animals

2. Use of agricultural and suburban areas, or golf courses
5—Readily inhabits or forages in these areas
3—Will occasionally inhabit or forage in these areas
1—Avoids these areas

3. Residency
5—Year-round resident (does not migrate)
4—Migrates within study area
3—Migrates beyond study area (present during breeding)
2—Migrates beyond study area (present during winter)
1—Transient (present during migration only)

4. Social structure
5—Highly colonial or gregarious
3—Semi-colonial or semi-gregarious

5. Range
5—Present in small part of study area only
4—Present throughout less than half of study area
3—Present throughout about half of study area
2—Present throughout more than half of study area
1—Present throughout entire study area

1. Feeding specialization
5—Highly specialized
4—Somewhat specialized
3—Moderately adaptable
2—Very adaptable

2. Ability to metabolize and clear OPs
5—Low (fish-eating birds)
3—Moderate (other birds and mammals, reptiles)
1—High (rodents and lagomorphs, gallinaceous birds)

1. Peak abundance in study area during season of concern
5—Rare (Not normally present)
4—Occasional (Presence possible, but not expected)
3—Uncommon (Presence expected, but not a certainty)
2—Common (Certain to be in suitable habitat)
1—Abundant (Numerous in suitable habitat)

2. Distribution outside of study area
5—endemic to study area
3—present outside of study area, but not abundant
1—abundant outside of study area

3. Reproductive potential
5—Low (1-2 offspring per year)
3—Moderate (3-4 offspring per year)
1—High (>4 offspring per year)

4. Age at first breeding
5—6+ years
4—5 years
3—4 years
2—3 years
1—1-2 years