Estimating trophic levels and trophic magnification factors using bayesian inference

  • Starrfelt J
  • Borgå K
  • Ruus A
 et al. 
  • 36


    Mendeley users who have this article in their library.
  • 10


    Citations of this article.


Food web biomagnification is increasingly assessed by estimating trophic magnification factors (TMF) where solvent (often lipid) normalized contaminant concentration is regressed onto the trophic level, and TMFs are represented by the slope of the relationship. In TMF regressions, the uncertainty in the contaminant concentrations is appreciated, whereas the trophic levels are assumed independent and not associated with variability or uncertainty pertaining to e.g. quantification. In reality, the trophic levels may vary due to measurement error in stable isotopes of nitrogen (δ15N) of each sample, in δ15N in selected reference baseline trophic level, and in the enrichment factor of δ15N between two trophic levels (ΔN), which are all needed to calculate trophic levels. The present study used a Markov Chain Monte Carlo method, with knowledge about the food web structure, which resulted in a dramatic increase in the precision in the TMF estimates. This also lead to a better understanding of the uncertainties ...

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • Jostein Starrfelt

  • Katrine Borgå

  • Anders Ruus

  • Eirik Fjeld

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free