effectiveness_pckg: Effectiveness landscapes

#' Quantitative component of effectiveness for Cecropia glaziovii-frugivorous birds interactions.
#' Focal observations at Parque Estadual Intervales, Sao Paulo. 
#' Pedro Jordano. 25 Mar 2012.
#'
#' Data from a field project during the Frugivory and Seed dispersal field course, 2012. 
#' 
#' Visitation data come from 140 h direct watches. A data.frame with 42 obs. of  37 variables. 
#'
#' First 6 variables are codes for Class, Order, Family, Genus, Species, and species label.
#'
#' Variables include:
#'
#' totvis-             Number of visits recorded, pooled all trees.
#'
#' totbic-             Mean number of peckings to Cecropia catkins during a single visit. Birds do several peckings and ingest the seeds from these small pieces of the catkins. This may be used to estimate ingestion rate per visit.
#'
#' sde-                Effectiveness estimate for the quantitative component, totvis * totbic.
#'
#' Columns 10-37 are the number of visits recorded to each individual Cecropia tree.
#'
#' @docType data
#' 
#' @usage data(cecropia)
#'
#' @format A dataset (dataframe).
#'
#' @keywords datasets
#'
#' @source \href{https://raw.githubusercontent.com/pedroj/effectiveness/master/cecropia/data.txt}{Data txt archive}
#'
"cecropia"