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|