Significats de dumbbell model en anglès

They found their answer in the model of allopatric speciation.

Rather, it is probable that most new brachiopod species of this age originated by allopatric speciation.

I then made my usual linkage to ordinary allopatric speciation, not to any novel or controversial mechanism of microevolution.

Our theory holds, as a defining statement, that ordinary allopatric speciation, unfolding gradually at microevolutionary scales, translates to punctuation in geological time.

The two accounts invoke entirely different principles of saltational vs. allopatric speciation, but the two arguments still employ an isomorphic logic).