BEASTObject that performs calculations based on the State.
Gene lineages are assumed to diverge under a speciation process, constrained within species tree
| type: starbeast3.tree.SpeciesTree |
| The species tree this population model is assoicated with. |
| Required input |
| type: beast.base.inference.parameter.RealParameter |
| Per-branch birth rate. |
| Required input |