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Mercury Vulnerability Index

For natural history information of bird species, visit the Patuxent Bird Identification Infocenter page. For other species, visit the University of Michigan Animal Diversity Web

Enter the name of your species:


A. Exposure Potential


1. Primary Dietary Preference
(Check more than one if applicable)

Fish
Terrestrial vertebrates or aquatic invertebrates
Both vegetation and animals (aquatic or semiaquatic omnivore)
Both vegetation and animals(terrestrial omnivore)
Vegetation

2. Longevity
(Based upon maximum recorded lifespan of free-ranging individuals;
assume intensely hunted species are short-lived.)

For birds, you can consult the Patuxent Bird Banding Laboratory
Longevity Records
.

Long lived (>15 years)
5-15 years
<5 years

3. Use of industrial or urbanized areas, and areas vulnerable to acid precipitation

Readily inhabits and/or forages in these areas
Will occasionally utilize these areas
Avoids these areas

4. Residency

Year-round resident (does not migrate)
Migrates within study area
Migrates beyond study area (present during breeding)
Migrates beyond study area (present during winter)
Transient (present during migration only)

5. Social structure

Highly colonial or gregarious
Semi-colonial or semi-gregarious
Solitary

6. Range

Present throughout entire study area
Present throughout more than half of study area
Present throughout about half the study area
Present throughout less than half the study area
Present in small part of study area only

B. Sensitivity


1. Molt

Does not molt
Molts infrequently (interval of complete molt > 1 yr)
Molts frequently (interval of complete molt < 1 yr)

C. Resilience of Population


1. Abundance in study area

Abundant (numerous in suitable habitat)
Common (certain to be in suitable habitat)
Uncommon (presence expected, but not a certainty)
Occasional (presence possible, but not expected)
Rare (not normally present)

2. Distribution outside of study area

Endemic to study area
Present outside of study area, but not abundant
Abundant outside of study area

3. Reproductive potential

Low (1-2 offspring/yr)
Moderate (3-4 offspring/yr)
High (>4 offspring/yr)

4. Age at first breeding

6+ yr
5 yr
4 yr
3 yr
1-2 yr

Click button to calculate the Vulnerability Index Scores:


Vulnerability Index Scores (Scale = 3.71 - 20)

Species:

Mercury Vulnerability Score: View Rankings


Enter another species:


Ranking of Species Vulnerability Index Scores, From Highest to Lowest

Rank Species Score

What do these scores mean?





URL: http://www.pwrc.usgs.gov/contaminants-online/
Contact: Barnett Rattner
Last modified: 10/08/2003
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