DAISIEprep is an R package that enables the extraction and formatting of phylogenetic data on island species for the inference model DAISIE (Dynamic Assembly of Island biota through Speciation, Immigration and Extinction). The central function,
DAISIEprep::extract_island_species(), uses data from phylogenetic trees and species island endemicity statuses (i.e. endemic to the island, non-endemic, or not present on the island). The phylogenetic and endemicity data are handled together using the
phylo4d S4 class from the
phylobase R package.
DAISIEprep fills the niche of standardised, reproducible data processing for the suite of DAISIE inference models. Unlike other phylogenetic methods implemented in R, DAISIE has yet to have a defined methodological framework to extract and format data prior to analysis. While other phylogenetic models in R commonly use the
phylo S3 data structure, defined by the R package
ape, DAISIE has an idiosynchratic data structure that will be unfamiliar to new users. This package provides a set of tools for those users to facilitate the application of DAISIE’s models for research. The package also opens the possibility of extracting island data from ‘big data’ macrophylogenies (>5,000 species) which would have impeded researchers who would have previously had to extract this data manually.
There are two algorithms to extract the data the
min algorithm or
asr (ancestral state reconstruction) algorithm. The former is based on the rules/assumptions of the DAISIE inference model of colonisation of species from mainland source pool, speciation on the island through cladogenesis or anagenensis, and island extinction. Therefore, this algorithm assumes no back-colonisation from the island to the mainland or mainland evolutionary processes. If the data seems to conform to these assumptions (by visual inspection) then this is a good method to choose (
DAISIEprep::extract_island_species(..., extraction_method = “min”). Alternatively, the data may violate these assumptions, by, for example having species within an island radiation migrate back to the mainland. In these, and other cases the
asr algorithm provides a method to extract data based on the most probable reconstruction of the species ranges (i.e. island presence/absence) and then can extract clades that may have non-island species (
DAISIEprep::extract_island_species(..., extraction_method = “asr”). The
asr algorithm utilises ancestral state reconstruction methods from other packages (e.g.
castor), but the package is flexible to users extending this to incorporate other models which may better suit their data set.
The DAISIE team always welcomes contributions to any of its packages. If you would like to contribute to this package please follow the contributing guidelines
Please note that the DAISIEprep project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.