Trophic redundancy

Trophic redundancy is the overlap in ecological function among species occupying similar positions in a food web. When multiple species perform the same trophic role — consuming the same prey, occupying the same level, exerting the same regulatory pressure — the web possesses redundancy. This redundancy is a form of functional diversity that buffers the ecosystem against species loss: if one redundant species disappears, others can compensate, preserving energy flow and network structure. But redundancy is not unlimited. Ecosystems with high redundancy in some roles and low redundancy in others are vulnerable to targeted loss of the non-redundant species, a phenomenon known as asymmetric fragility. The concept connects food web ecology to engineering reliability theory and raises the question of whether redundancy is a designed property or an emergent byproduct of species packing.