Data for: Habitat diversity, resource availability, and island age in the species-area relationship

Aim: The island species-area relationship (ISAR) and its theoretical justifications assume the area of islands to be homogeneous across an archipelago, which is generally not the case. We compare the performance of models that adjust or substitute for island area with measures of habitat diversity, island age, and resource availability to account for the violation of this assumption. We further compare the performance of models for two taxonomic groups.
Location: Five hotspot archipelagos (Azores, Galapagos, Hawaii, Cape Verde, Canary Islands).
Taxa: Vascular plants and birds.
Methods: We used the mathematical framework of the power law to compare relevant models, treating the one containing only area as a null model against which others were compared. Data was collated from the GIFT database and from the literature. Models were compared using linear regression within archipelagos and via mixed effect models with archipelago as a random effect.
Results: Weighting of island area by habit..., Data was collected from published sources and the current upload is collected analysis relating to the paper JBI-21-0522. Regression analysis was performed using R packages. , Required software: R  (preferrably R studio).