Tiger Salamander

🌍 Overview

The tiger salamander is the largest land-dwelling salamander in North America, found across a vast range from Canada to Mexico. They are burrowing animals that spend most of their lives underground, emerging to breed in temporary and permanent ponds. In some lake environments, individuals remain permanently aquatic and sexually mature without fully metamorphosing - a neotenic phenomenon. Some of these neotenic populations were historically described as entirely separate species before genetic analysis revealed their true relationship.

📋 Quick Facts

📜 History

Jacob Green described the species in 1825, but its most consequential history has been commercial. Larvae are sold across the United States as fishing bait under the name waterdogs, and West Coast populations exist because bait animals were released there rather than because the species spread on its own. In California that trade produced a genetic emergency: barred tiger salamanders introduced into central California ponds in the middle of the twentieth century interbred with the federally endangered California tiger salamander, and work by Benjamin Fitzpatrick and Bradley Shaffer published in the Proceedings of the National Academy of Sciences in September 2007 found the hybrids unexpectedly vigorous. The same trade moves Ambystoma tigrinum virus, a ranavirus common in bait shop stock.

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