forest.birds.Rd

% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/data-forest.birds.R
\docType{data}
\name{forest.birds}
\alias{forest.birds}
\title{A dataset to study the relationship between species abundance of birds and habitat features.}
\format{
A tibble with 56 rows and 8 variables:
\describe{
\item{\code{abundance}}{Numeric vector. Average number of forest birds observed
in the patch, as calculated from several independent 20-minute counting sessions.}
\item{\code{patch.area}}{Numeric vector.  The area of the patch. Areas were measured
in hectares; 1 hectare is 10,000 square meters and approximately 2.47 acres.}
\item{\code{year.of.isolation}}{The year the patch was isolated by fragmentation of
local environment.}
\item{\code{dist.nearest}}{Numeric vector.  Distance to the nearest patch,
measured in kilometers.}
\item{\code{dist.larger}}{Numeric vector.  Distance to the nearest patch that is
larger than the current patch, measured in kilometers.}
\item{\code{grazing.intensity}}{Factor.  A score indicating the extent of
livestock grazing. The categories are: "light", "less than average",
"average", "moderately heavy", "heavy".}
\item{\code{altitude}}{Numeric vector. Altitude of the patch, measured in meters.}
\item{\code{yrs.isolation}}{Numeric vector. Number of years of isolation at the
time study was conducted (1983).Computed as 1983 - year.of.isolation}
}
}
\source{
\url{https://users.monash.edu.au/~murray/BDAR/}  Listed under chapter 9 datasets
}
\usage{
forest.birds
}
\description{
Contains a subset of the variables from a larger 1987 study analyzing
the effect of habitat fragmentation on bird abundance in the
Latrobe Valley of southeastern Victoria, Australia.
Habitat fragmentation is the process in which land development disrupts the
native habitat of certain species.
The dataset has variables on forest bird abundance in a forest patch
(typically the response of interest) and features of patch.
}
\references{
Loyn R.H. 1987 Effects of patch area and habitat on bird abundances,
species numbers and tree health in fragmented Victorian forests."  In Nature
Conservation: The Role of Remnants of Native Vegetation.
Saunders DA, Arnold GW, Burbridge AA, and Hopkins AJM eds. Surrey Beatty and Sons,
Chipping Norton, NSW, 65-77, 1987.  Logan, M 2011 Biostatistical Design and
Analysis Using R.  Wiley-Blackwell, Chapter 9
}
\keyword{datasets}