You would not usually call this function directly but instead use
getFeedingLevel(), which then calls this function unless an alternative
function has been registered, see below.
mizerFeedingLevel(params, n, n_pp, n_other, t, encounter, ...)A two dimensional array (predator species x predator size) with the feeding level.
A MizerParams object
A matrix of species abundances (species x size).
A vector of the resource abundance by size
A list of abundances for other dynamical components of the ecosystem
The time for which to do the calculation (Not used by standard mizer rate functions but useful for extensions with time-dependent parameters.)
A two dimensional array (predator species x predator size) with the encounter rate.
Unused
The feeding level \(f_i(w)\) is the
proportion of its maximum intake rate at which the predator is actually
taking in fish. It is calculated from the encounter rate \(E_i\) and the
maximum intake rate \(h_i(w)\) as
$$f_i(w) = \frac{E_i(w)}{E_i(w)+h_i(w)}.$$
The encounter rate \(E_i\) is passed as an argument or calculated with
getEncounter(). The maximum intake rate \(h_i(w)\) is
taken from the params object, and is set with
setMaxIntakeRate().
As a consequence of the above expression for the feeding level,
\(1-f_i(w)\) is the proportion of the food available to it that the
predator actually consumes.
By default getFeedingLevel() calls mizerFeedingLevel(). However you can
replace this with your own alternative feeding level function. If
your function is called "myFeedingLevel" then you register it in a MizerParams
object params with
params <- setRateFunction(params, "FeedingLevel", "myFeedingLevel")
Your function will then be called instead of mizerFeedingLevel(), with the
same arguments.
The feeding level is used in mizerEReproAndGrowth() and in
mizerPredRate().
Other mizer rate functions:
mizerEGrowth(),
mizerERepro(),
mizerEReproAndGrowth(),
mizerEncounter(),
mizerFMort(),
mizerFMortGear(),
mizerMort(),
mizerPredMort(),
mizerPredRate(),
mizerRDI(),
mizerRates(),
mizerResourceMort()