R/Savannah_sparrow.R

In DistanceDevelopment/dsdata: Distance sampling workshop data

#' Savanna sparrow point transects 
#'
#' Point transect data collected in Colorado 1980/81 to examine effect of
#' agricultural practices upon avian community.  
#' 
#' Design consisted of point transects placed in multiple pastures 
#' (3 in 1980, 4 in 1981).  While many species were observed, only data for 
#' Savannah sparrows (Passerculus sandwichensis) are included here.
#'
#' @references Knopf, F.L., J.A. Sedgwick, and R.W. Cannon. (1988) Guild 
#' structure of a riparian avifauna relative to seasonal cattle grazing. 
#' The Journal of Wildlife Management 52 (2): 280–290. https://doi.org/10.2307/3801235.
#'
#' @name Savannah_sparrow_1980
#' @aliases Savannah_sparrow_1981 Savannah_sparrow_1980_units Savannah_sparrow_1981_units
#' @keywords datasets
#' @docType data
#' @format \code{data.frame} with 468 observations of 7 variables:
#' \tabular{ll}{
#' \code{Region.Label} \tab stratum label (pasture ID) \cr
#' \code{Area} \tab stratum area (set to 1 so density is reported) \cr
#' \code{Sample.Label} \tab transect identifier \cr
#' \code{Effort} \tab number of visits \cr
#' \code{object} \tab object ID \cr
#' \code{distance} \tab radial distance (m) \cr
#' \code{Study.Area} \tab name of study area
#' }
#' 
#' @note Data structure for 1981 data set is identical, but there are 
#' 448 observations across 4 pastures.
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