Head to head
Columbia Torrent Salamander vs Southern Torrent Salamander
A Columbia torrent salamander and a southern torrent salamander both belong to the same small genus of cold-water specialists, yet they occupy opposite ends of the group's Pacific coastal mountain range, separated by hundreds of miles of unsuitable terrain.
| Columbia Torrent Salamander | Southern Torrent Salamander | |
|---|---|---|
| Scientific name | Rhyacotriton kezeri | Rhyacotriton variegatus |
| Range | Coast Range, SW Washington/NW Oregon | N. California and SW Oregon coastal mountains |
| Position within the 4-species genus | North-central | Southernmost |
| Thermal tolerance | Extremely narrow, cold water only | Extremely narrow, cold water only |
| Lungs | Small, retained | Small, retained |
| Tail shape | Short, squared-off | Short, squared-off |
| Used as an old-growth stream indicator | Yes | Yes |
| Conservation status | Near Threatened | Near Threatened |
Columbia Torrent Salamander vs Southern Torrent Salamander: common questions
How far apart do the Columbia and southern torrent salamanders live?
Quite far — the Columbia torrent salamander occupies the Coast Range of southwestern Washington and northwestern Oregon, while the southern torrent salamander holds the genus's southernmost range across northern California and southwestern Oregon, with the other two torrent salamander species occupying the territory in between.
Can you tell a Columbia torrent salamander from a southern torrent salamander by looking at it?
Not reliably — both share the same short, squared-off tail, small retained lungs, and extremely narrow cold-water tolerance, and range is generally the most practical way to determine which of the four torrent salamander species you have actually found.
Why were the torrent salamanders split into four separate species?
Genetic and physical study eventually confirmed enough consistent differences between geographically separated populations, including the Columbia and southern torrent salamanders, to justify splitting what was once treated as a single wide-ranging species into four distinct ones, each confined to its own stretch of the Pacific coastal mountains.