Estimate trophic position using a one source model derived from Post 2002 using a Bayesian framework.
Details
$$\delta^{15}N = \delta^{15} N_1 + \Delta N \times (tp - \lambda_1)$$
\(\delta^{15}\)N are values from the consumer,
\(\delta^{15} N_1\) is mean \(\delta^{15}\)N values of baseline 1,
\(\Delta\)N is the trophic discrimination factor for N (i.e., dn
mean
of 3.4
), \(tp\) is trophic position, and \(\lambda_1\) is the
trophic level of baselines which are often a primary consumer (e.g., 2
).
The data supplied to brms()
needs to have the following variables d15n
,
n1
, and l1
(\(\lambda\)) which is usually 2
.