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At high tide, this reef will be covered in turbid water, and large predators like catfish, blue crabs, and red drum move in to eat smaller animals such as mud crabs.

Sounds of the Oyster Reef

Rob Diaz de Villegas WFSU-TV

IGOR chip_ predators_NCE 150Imagine you’re watching a slasher movie starring mud crabs as the protagonists.  A mud crab leaves the party in the muck under the oyster reef, where the other crabs are chomping down juvenile oysters.  As he pokes his head out from between a couple of shells, you hear a drumming sound and you shout at the screen “Don’t go out there!”

It’s fun to anthropomorphize some of the freaky looking residents of an oyster reef.  But these are the realities of living within the ecology of fear.  Predator cues have a definitive impact on how the smaller, intermediate consumers such as mud crabs behave.  That’s what David Kimbro, Randall Hughes & co. are studying in Alligator Harbor and at their sites across the southeast.  Large predators send certain cues to their prey- perhaps a certain way they move in the water, perhaps.  When the prey species sense that the predators are near, they cease activity- including the eating of juvenile oysters.  That is how large predators help maintain a healthy oyster reef- they make intermediate consumers (mud crabs) eat less of the basal species (oysters, the foundation of the oyster reef habitat). Continue reading