Mud shrimp Area
The mud shrimp area consisted of silty mud that was sometimes more than 50 cm deep.  The area is partly covered by the green alga Ulva.  (For details on the sediment composition, see the physical environment page.)  It is a potentially dangerous area for exploring due to foot sinkage.  In addition to finding three families of polychaete worms (Lumbrineridae, Nereidae, and Orbiniidae), one sea cucumber species (Leptosynapta clarki) and three species of molluscs (including the bent-nose clam, Macoma nasuta) below the surface, two thalassinid crustaceans were also common in the sediment (mud shrimp Upogebia pugettensis and ghost shrimp Callianassa californiensis) and were rarely encountered elsewhere in False Bay.  A small commensal clam (Orobitella rugifera), which attaches to the underside of Upogebia (see middle photo above), was also particular to this habitat. The species composition in this area may have been partly determined by the muddy substrate, its protection from wave action, and the partial algal covering.

Click here to get an overview of taxonomic diversity of this habitat as compared to the other three.
Click here to learn about the abundance of organisms or to get a description of organisms found in this habitat.
Go here to learn more about protection, reproduction, feeding, and locomotion of these organisms.