Decades of field research have demolished the old myth of the passive scavenger. Far from sitting back and waiting for deep-sea debris, crabs run complex predatory and herbivorous operations that anchor coastal food webs. They grind tough vegetation in salt marshes, aerate intertidal mudflats, and check bivalve populations across productive estuaries.
Human activities continue to reshape their wild foraging choices. Ocean acidification strips carbonate ions out of shallow bays, making it harder for crabs to pull calcified prey apart and rebuild their own armor after ecdysis. At the same time, coastal agricultural runoff drives massive algae blooms, altering the baseline forage available along populated shorelines. Decapods adapt with remarkable resilience, but their long-term balance depends on the health of the intertidal zones they patrol.
