betapart (version 1.5.4)

bbsData: BBS data by state for two timeslices

Description

The data consists of binary presence/absence matrices for 569 bird species across 49 US states for two time slices (1980 - 1985 and 2000 - 2005). Only species (identified by AOU number) recorded during both time periods are included. The data are taken from the North American Breeding Bird Survey dataset and from a version of the database downloaded in May 2009.

Usage

data(bbsData)

Format

Two matrices (bbs1980 and bbs2000) of identical structure showing the presence/absence of the species as binary data.

state

US states by USPS two letter codes.

aou

Species identity by AOU species ID numbers.

Examples

# NOT RUN {
data(bbsData)
str(bbs1980)
str(bbs2000)
# }