Many symbiotic and predatory relationships are relevant to the estuary biome. Here is an example of a common food chain in an estuary:
Phytoplankton(producer)-Zooplankton(primary consumer)-Crab (Secondary consumer)-Fish(Tertiary consumer)-Human (Quaternary consumer). In the Chesapeake Bay estuary discussed before this chain is prevalent. On the left is a Chesapeake Bay food chain illustrating this. Above is a Chesapeake Bay food web.
These food webs and food chains illustrate common predator-prey relationships in estuaries. Several of these include:
The Blue crab (Callinectes sapidus) and the infaunal clam prey (Mya arenaria).