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The sub-Antarctic environment has been one of the most visited and densely populated areas of Antarctica, related to the presence of sealers and whalers during late-19th to early-20th century and, recently, tourists and research projects. The region has been subject to the risk of hydrocarbon contamination, since human activities in this region require the use of fossil fuels as an energy source. Temporal and spatial distribution on levels and sources of aliphatic hydrocarbons were studied in dated sediment cores from Admiralty Bay and in Deception Island. Total aliphatic hydrocarbons ranged from 3.67 to 25.5 μg.g-1, similar to levels found in other Antarctic areas. Temporal distributions suggested a constant input of natural sources of aliphatic hydrocarbons in older sediments (before the early-80s) and some anthropogenic contribution may be presented in recent sediments, since the early-90s. Due to the presence of biogenic contribution, other organic markers such as polycyclic aromatic hydrocarbons may be used to confirm the history of hydrocarbon input in the sediments of Admiralty Bay and Deception Island.

TEMPORAL VARIATIONS IN ALIPHATIC HYDROCARBONS IN SEDIMENT CORES FROM ADMIRALTY BAY AND DECEPTION ISLAND, ANTARCTICA