Computes island-age-corrected in-situ speciation rates

Modifies insitu_speciation_rate to use island formation age as the time denominator rather than total root-to-tip path length. This gives the rate of in-situ speciation per unit time that the island has existed. This approach allows for comparing diversification dynamics across islands of different geological ages.Events that predate island formation are excluded from the count before computing rates.

Usage

insitu_rate_by_island_age(phy, events, island_ages)

Arguments

phy

The matched phylogenetic tree.

events

The data frame returned by age_correct_events, which must include node_age, island_age, and predates_island columns.

island_ages

A named numeric vector of island formation ages, in the same units as branch lengths.

Value

A data frame with one row per island and columns:

island

Island name.

n_insitu

Number of valid in-situ events (excluding those predating the island).

island_age

Island formation age.

insitu_rate_corrected

In-situ events per unit time since island formation.