R/yftdiet.r

In pkuhnert/diet: Performs an analysis of diet data using univariate trees

#' Yellowfin Tuna Diet data
#' 
#' @description 
#' Yellowfin tuna (YFT) were captured by purse-seine fishing vessels in the eastern
#' tropical Pacific (ETP) between 16 August 2003 and 16 November 2005. 
#' 
#' 
#' @format 
#' A data frame with 660 observations on the following 13 variables.
#' \describe{
#' \item{\code{TripSetNo}}{A unique number representing the purse-seine vessel's Trip and Set number}
#' \item{\code{TripSetPredNo}}{A unique number representing the purse-seine vessel's Trip and Set number, and the YFT sample number}
#' \item{\code{Date}}{Date YFT was captured}
#' \item{\code{Quarter}}{Quarter in which YFT was captured}
#' \item{\code{Year}}{Year in which YFT was captured}
#' \item{\code{Lat}}{Latitude coordinates where YFT was captured}
#' \item{\code{Lon}}{Longitude coordinates where YFT was captured}
#' \item{\code{SST}}{Sea-surface temperature at location where YFT was captured, measured in degrees C}
#' \item{\code{PredSpp}}{Predator species}
#' \item{\code{Length}}{Predator length in mm}
#' \item{\code{Fullness}}{Visual estimate of YFT stomach fullness, expressed as a percentage}
#' \item{\code{W}}{Case weights}
#' \item{\code{Group}}{Prey Group. A factor with levels \code{Argonautidae} 
#' \code{Exocoetidae} \code{Galatheidae} \code{Hemiramphidae} \code{Myctophidae} 
#' \code{Nomeidae} \code{Ommastrephidae} \code{Ostraciidae} \code{Phosichthyidae} 
#' \code{Portunidae} \code{Scombridae} \code{Tetraodontidae}}
#' }    
#' 
#' @details 
#' YFT were sampled onboard the vessels by observers of the Inter-American Tropical Tuna Commission (IATTC, 2004).  Fish
#' were randomly subsampled from purse-seine sets immediately after capture, and date, position, and 
#' sea-surface temperature (SST) were recorded for each set that yielded samples.  Observers measured
#' fork length of the fish, removed samples of white muscle tissue from the dorsal musculature adjacent
#' to the second dorsal fin and stored them at about -20 degrees C until processed further in the lab. 
#' Data is in predator-prey format where each row represents a unique predator-prey observation.
#' 
#' @source 
#' Olson RJ, Popp BN, Graham BS, Lopez-Ibarra GA, Galvan-Magana F, Lennert-Cody CE, 
#' Bocanegra-Castillo N, Wallsgrove NJ, Gier E, Alatorre-Ramirez V, Balance LT, Fry B (2010) 
#' Food web inferences of stable isotope spatial patterns in copepods and yellowfin tuna in the 
#' pelagic eastern Pacific Ocean. Prog Oceanogr.
#' 
#' IATTC, 2004. Annual Report of the Inter-American Tropical Tuna Commission, 2003. Inter-American
#' Tropical Tuna Commission, pp. 98.
#' 
"yftdiet"