Amphibians
Black Warrior Waterdog
Necturus alabamensis · also called Black Warrior waterdogs
Along the bottom of the Black Warrior River, a fully aquatic waterdog forages after dark in a watershed already reshaped by dams and decades of industrial pollution, its entire species confined to exactly this one heavily altered river system and nowhere else on Earth.
Overview
The Black Warrior waterdog, Necturus alabamensis, is a fully aquatic, gilled salamander found only within the Black Warrior River system of Alabama. Its extraordinarily narrow range, combined with a history of dam construction and industrial pollution within that single watershed, make it one of the more critically threatened fully aquatic salamanders in North America.
A species with nowhere else to go
When an entire species’ range consists of one already-altered river, there is no backup population to fall back on if conditions worsen further, leaving the Black Warrior waterdog’s fate tied directly to the health of a single, heavily used Alabama waterway.
Status
Endangered — confined to the Black Warrior River system of Alabama, severely affected by dam construction and industrial pollution.
Black Warrior Waterdog: common questions
Why is the Black Warrior waterdog so critically threatened?
A Black Warrior waterdog's entire population is confined to the Black Warrior River system of Alabama, a watershed significantly altered by dam construction and industrial pollution, and because the species exists nowhere else, this concentrated habitat degradation has had an outsized impact on its overall population.
Does the Black Warrior waterdog ever leave the water?
No, a Black Warrior waterdog retains large, feathery external gills throughout its entire life and never undergoes metamorphosis into a land-dwelling adult, remaining fully aquatic for its whole lifespan like other members of its genus.
How is the Black Warrior waterdog related to the Neuse River waterdog?
Both are closely related members of the genus Necturus, sharing a similar fully aquatic, gilled lifestyle, though each is confined to its own separate river system, the Black Warrior River in Alabama for one and the Neuse and Tar Rivers in North Carolina for the other, with no overlap between their ranges.
Where does the Black Warrior waterdog live?
The Black Warrior waterdog is native exclusively to the Black Warrior River system of Alabama, generally sheltering beneath rocks, logs, and debris during the day and foraging along the river bottom at night.