Galveston Bay Estuary Food Web
Marine
Texas Gulf Coast, United States
Description
Galveston Bay is a highly productive Texas estuary supporting major shrimp and oyster fisheries. Freshwater inflow from the Trinity and San Jacinto rivers creates salinity gradients that structure species distribution. The food web connects coastal marshes, oyster reefs, and open water habitats through migratory species.
Trophic Pyramid
Level 5
Decomposers
Estuarine bacteria
Polychaete worms
Mud crabs
3 species
Level 4
Tertiary Consumers
Bottlenose dolphin
Bull shark
Brown pelican
3 species
Level 3
Secondary Consumers
Spotted seatrout
Blue crab
Roseate spoonbill
3 species
Level 2
Primary Consumers
Brown shrimp
Eastern oyster
Gulf menhaden
3 species
Level 1
Producers
Spartina marsh grass
Phytoplankton
Oyster reef algae
3 species
Apex Predators
Tertiary Consumers
Secondary Consumers
Primary Consumers
Producers
Key Interactions
- Oyster reefs filter water and provide structural habitat for juvenile fish and crabs
- Brown shrimp use marsh edges as nursery habitat before migrating to open water
- Bottlenose dolphins cooperatively herd fish against mud banks
- Freshwater inflow regulates salinity gradients that structure community composition