The rates of speciation are hardly stable—it’s a reason why there’s so much controversy over the history of Deschampsia antarctica, a grass species growing in Maritime Antarctica, Subantarctic and in Chile, I think. People argue whether it was recently introduced to Antarctica (which is unlikely, given the gap between it and S America) or has survived there since before it grew the ice shield (which is unlikely, given how similar are plants from remote locations.)
If speciation rates were easily determined, this would not be much of a question.
The rates of speciation are hardly stable—it’s a reason why there’s so much controversy over the history of Deschampsia antarctica, a grass species growing in Maritime Antarctica, Subantarctic and in Chile, I think. People argue whether it was recently introduced to Antarctica (which is unlikely, given the gap between it and S America) or has survived there since before it grew the ice shield (which is unlikely, given how similar are plants from remote locations.)
If speciation rates were easily determined, this would not be much of a question.