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The article focuses on a study about the community structure and feeding preference of nematodes in relation to methane seepage at the Darwin mud volcano (MV) located at the Gulf of Cádiz, Spain. It is said that cold seep sites have few dominant species due to lower species diversity, adding that food sources for seep fauna range from organic matter from chemoautotrophic bacteria to photosynthetic organic matter. Findings show that nematode genus diversity exhibits the lowest levels in the seep sediment core and increases with distance. The study also notes that thiotrophic C forms part of the diet of nematodes up to 10 meters (m) from seepage site.