Assesses the nutritional quality of the diet based on energy density, macronutrient composition, and digestibility of prey items.
Value
A named list whose elements depend on whether the diet is
time-varying or static. Always present: mean_energy_density
(numeric, J/g), energy_density_sd (numeric), and
energy_density_range (numeric vector of length 2). For
time-varying diets, daily_energy_density (numeric vector) is
also included. When prey_digestibility is supplied, the list
additionally contains mean_digestibility, digestibility_sd,
and (for time-varying diets) daily_digestibility. A
diversity sub-list with mean_shannon and
shannon_sd (and daily_shannon for time-varying diets) is
always appended.
Examples
diet <- list(proportions = data.frame(Day = 1:5,
Prey1 = c(0.6, 0.6, 0.7, 0.5, 0.5),
Prey2 = c(0.4, 0.4, 0.3, 0.5, 0.5)))
prey_e <- data.frame(Day = 1:5, Prey1 = 5000, Prey2 = 4500)
assess_diet_quality(diet, prey_e)
#> $mean_energy_density
#> [1] 4790
#>
#> $energy_density_sd
#> [1] 41.833
#>
#> $energy_density_range
#> [1] 4750 4850
#>
#> $daily_energy_density
#> [1] 4800 4800 4850 4750 4750
#>
#> $diversity
#> $diversity$mean_shannon
#> [1] 0.6686364
#>
#> $diversity$shannon_sd
#> [1] 0.03382846
#>
#> $diversity$daily_shannon
#> [1] 0.6730117 0.6730117 0.6108643 0.6931472 0.6931472
#>
#>