Further investigation found evidence the formation was caused by methane leaking out of the seafloor, which would make it the first so-called "methane seep" in San Diego County, the Scripps Institution of Oceanography at UC San Diego announced yesterday (July 25).
The Scripps researchers took samples from 3,400 feet (1,036 meters) below the surface and bought up strange worms and clams that likely live off symbiotic bacteria that break down the clear, flammable gas.
Such sites are important oases of life on the dark seafloor, with the methane-eating bacteria at the base of a rich and productive community that helps sustain the surrounding deep-sea ecosystem.
"These chemosynthetic ecosystems are considered 'hot spots' of life on the seafloor in an otherwise desert-like landscape," said expedition member Alexis Pasulka, a Scripps biological oceanography graduate student, in a statement. "New forms of life are continuously being discovered in these environments."
Organisms collected from the newly discovered site include thread-like tubeworms called siboglinids and several clams. Siboglinids lack a mouth and digestive system and gain nutrition from a symbiotic relationship with bacteria living inside them, while many clams at seeps get some of their food from sulfide-loving bacteria living on their gills.
The scientists found the site 20 miles (32 kilometers) west of Del Mar, Calif. It's centered on a fault zone known as the San Diego Trough Fault zone. Methane, or natural gas, exists in the Earth's crust under the seafloor along many of the world's continental margins. Faults can provide a pathway for methane to "seep" upward toward the seafloor.
Read more at Discovery News
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