These are some useful tools for molecular analysis of trophic interactions.
Food Web Designer
Sint & Traugott 2016. JPS. Doi: 10.1007/s10340-015-0686-7
Food Web Designer 3.0
Manual
DNA Calculator
Sint et al. 2012. MEE. Doi: 10.1111/j.2041-210X.2012.00215.x
DNA calculator
