#' Compute rmax from adult female body mass
#'
#' @description
#' The demographic potential of a species is limited. The intrinsic rate of
#' increase `rmax` is the maximum increase in log population size that a
#' species can attain in a year. According to Sinclair (2003), it is related
#' to the body mass of adult females by: \eqn{1.375 \times W^{-0.315}}
#'
#' @param w a numerical vector. Adult female body mass (in kg).
#'
#' @export
#'
#' @return A numerical vector of `rmax` values.
#'
#' @references
#' Sinclair (2013) Mammal population regulation, keystone processes and
#' ecosystem dynamics. _Philosophical Transactions: Biological Sciences_,
#' **358**, 1729-1740.
#'
#' @examples
#' ## Set adult female body mass ----
#' body_masses <- c(55, 127)
#'
#' ## Add species names ----
#' names(body_masses) <- c("Impala", "Tiang")
#'
#' ## Compute species rmax ----
#' w_to_rmax(body_masses)
w_to_rmax <- function(w) 1.375 * w ^ -0.315
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