A computer model of tube worm aggregations was created for Lamellibrachia luymesi, which is among the longest lived animals known. Both actual and model populations persist for centuries and take up high quantities of sulfide from seep sediments. Tube worms live off of sulfide (the toxic chemical responsible for the smell of rotten eggs) by supplying it to internal bacteria which use sulfide as an energy source.
To acquire sulfide, this tube worm grows "roots" through carbonate rock and into the sediment below. The roots deplete sulfide from the sediment, effectively preventing sulfide from seeping into the bottom water. Once the levels of toxic sulfide are reduced, the habitat provided by the bush-like aggregations is made available to deep-sea animals with lower sulfide tolerances.