Fig. 4. a) Core model signed-digraph, b) Community matrix, and c) Prediction matrix for the Huave Lagoon System, Mexico. Matrix elements (aij) were obtained from the signed-digraph. Example: The interaction between sea turtles and mollusk bycatch is depicted by the matrix elements a27 (-) and a72 (+), which correspond to a negative (—●) and positive (→) link, respectively. All self-effects are shown in the matrix diagonal, indicated as a11, a22, a33, etc. The prediction matrix indicates a positive disturbance (black arrow) that causes an increase in carnivorous bycatch species (CBC), and shows the response of each member of the community to this disturbance (marked column). The indicators and their relationships were constructed from Table 1.