Food web properties:

• Triangular shaped food webs of 2 sizes (6 and 12 species).

• 2 food web connectances(no. of links/(no. of species)²).

• Environmental noise of different autocorrelation structure.

Models: Two models based on Lotka-Volterra dynamics

• The MEVP model takes dynamics of all interacting species into account.
• The MVP model treats the impact from other species as a constant source incorporated in the species specific growth rate.

A Schematic picture showing the two models interaction and how critical population

sizes were retrived.