The origin and history of the British fauna

Considers the Irish stoat a representative of an earlier invasion that survived the last glaciation, whereas the British stoat is derived from a later invasion so is not distinct from the European subsp. Stoats on Jura could be a hybrid. In large populations, new subspecific characters do not evolve in <80,000 years, although in small populations differences can develop in 10,000. Many British species isolated from Continental relatives for 100,000 years and show no change.

Author B. P. Beirne
Year 1952
Place published London
Publisher Methuen