Data Sets for the Study of the Species-Area Relationship

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Description

Data sets for the study of the species-area relationship

Usage

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Format

A list of two data frames, see Details.

Details

The element sardata$islands is a data frame with variables:

study

Factor, levels are the study identifiers.

id

Numeric, island identifiers according to the original references.

S

Numeric, number of species according to the original references.

A

Numeric, area of the island in square kilometres, according to the original references.

The element sardata$studies is a data frame with variables:

study

Factor, levels are the study identifiers.

taxon.group

Factor, taxonomic group.

island.type

Factor, island type.

latitude

Numeric, middle band of latitude for the study calculated as (min + max) / 2, where min is the latitude close to the Equator, max is the latitude close to the poles.

extent

Numeric, latitudinal extent of the study.

location

Character, location of the study.

References

References are in the files sardata.txt and sardata.bib in the sharx library of R, labelled by study identifiers. See examples on how to recall the files from the console.

Examples

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## data structure
data(sardata)
str(sardata$islands)
str(sardata$studies)
## references
file.show(system.file(package = "sharx", "sardata.txt"))
file.show(system.file(package = "sharx", "sardata.bib"))