S-Ranks are used to specify the vulnerability of a species on in Arkansas alone. The "Score Value" contributes to the "Priority Score" for the Arkansas species of conservation concern. What is a Priority Score?
| S Rank |
Description |
Score Value |
| S? |
Unranked-not yet assessed |
1 |
| S1 |
Critically imperiled in Arkansas |
5 |
| S1? |
Critically imperiled in Arkansas
(inexact numeric rank) |
5 |
| S1B |
Critically imperiled breeding species in Arkansas |
5 |
| S1B,S2N |
Critically imperiled breeding, imperiled non breeding species in Arkansas |
5 |
| S1B,S3N |
Critically imperiled breeding, vulnerable non breeding species in Arkansas |
5 |
| S1B,S4N |
Critically imperiled breeding, apparently secure non breeding species in Arkansas |
5 |
| S1B,SZN |
Critically imperiled breeding, uncommon or irregular non breeding species in Arkansas |
5 |
| S1N |
Critically imperiled non breeding species in Arkansas |
5 |
| S1S2 |
Critically imperiled in Arkansas (uncertain rank) |
4.5 |
| S1S3 |
Critically imperiled in Arkansas (uncertain rank) |
4 |
| S2 |
Imperiled in Arkansas |
4 |
| S2? |
Imperiled in Arkansas (inexact numeric rank) |
4 |
| S2B |
Imperiled breeding species in Arkansas |
4 |
| S2B,S2N |
Imperiled breeding and non breeding species in Arkansas |
4 |
| S2B,S3N |
Imperiled breeding, vulnerable non breeding species in Arkansas |
4 |
| S2B,S4N |
Imperiled breeding, apparently secure non breeding species in Arkansas |
4 |
| S2S3 |
Imperiled species in Arkansas (uncertain rank) |
3.5 |
| S3 |
Vulnerable in Arkansas |
3 |
| S3? |
Vulnerable in Arkansas (inexact numeric rank) |
3 |
| S3B |
Vulnerable breeding species in Arkansas |
3 |
| S3B,S3N |
Vulnerable breeding and non breeding species in Arkansas |
3 |
| S3B,S5N |
Vulnerable breeding, secure non breeding species in Arkansas |
3 |
| S3B,SZN |
Vulnerable breeding, uncommon or irregular non breeding species in Arkansas |
3 |
| S3N |
Vulnerable non breeding species in Arkansas |
3 |
S3S4 |
Vulnerable species in Arkansas (uncertain rank) |
2.5 |
| S3S4B,SZN |
Vulnerable breeding (uncertain rank), uncommon or irregular non breeding species in Arkansas |
2.5 |
| S3S4N |
Vulnerable non breeding species in Arkansas (uncertain rank) |
2.5 |
| S4 |
Apparently secure in Arkansas |
2 |
| S4B |
Apparently secure breeding species in Arkansas |
2 |
S4B,S4N |
Apparently secure breeding, apparently secure non breeding species in Arkansas |
2 |
| S4B,S4S5N |
Apparently secure breeding, apparently secure non breeding species in Arkansas (uncertain rank) |
2 |
| S4B,S5N |
Apparently secure breeding, secure non breeding species in Arkansas |
2 |
| S4N |
Apparently secure non breeding species in Arkansas |
2 |
| S5 |
Secure in Arkansas |
1 |
| S5N |
Secure non breeding species in Arkansas |
1 |
| SA |
Of accidental occurrence in Arkansas |
1 |
| SE3 |
Reintroduced species, considered vulnerable in Arkansas |
3 |
| SH |
Of historic occurrence in Arkansas, possibly extirpated |
5 |
| SPB,S2N |
Potential breeding species, imperiled non breeding species in Arkansas |
2 |
| SU |
Presumed extirpated in Arkansas |
5 |
| SX |
Presumed extinct |
5 |
