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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.

The article presents the study conducted regarding the use of nitrogen and carbon isotope values of individual amino acids (AA) in determining the foraging ecology of the four penguin species in Southern Ocean. The study aims to identify these values of individual amino acids which isolated from the penguins' chick blood foraging in various oceanic regions. It shows that the carbon isotope values of all AAs have declined with latitude while the difference in the nitrogen isotope values of the penguins is due to the difference of their trophic levels and foraging locations. The result shows that the isotopes reflect the relative trophic level of the species.