In-situ speciation index per island — insitu_speciation

Computes a standardized index of in-situ contribution to diversity for each island. The index (isci) is the number of in-situ speciation events on an island divided by the total branch length of the island's subtree. This is, the sum of all branch lengths of all descendant tips that are exclusively assigned to that island.

Usage

insitu_speciation_index(phy, events)

Arguments

phy: Matched phylogenetic tree
events: The data frame returned by map_insitu_events

Value

A data frame with one row per island and columns:

island: Island name.
n_insitu: Number of in-situ speciation events.
island_bl: Total branch length of the island subtree.
isci: In-situ contribution index: n_insitu / island_bl.