According to data from the study, in 2007 pollution levels were very high. They exceeded 400 micrograms per kilogram in those areas closest to the oil spill and even exceeded 700 micrograms in those areas furthest away. In his study Domnguez concludes that this change is due to pyrogenic pollution sources, such as fires, which normally go unnoticed.
The expert recognises that "the interannual variations recorded during the study point towards a clear risk of getting close to dangerous levels" for the wildlife of the affected area. He goes on to add that the "course of the ship after the accident was so badly handled that that the fuel spread a lot more, which affected the entire Cantabrian and Atlantic coasts."
The study focused on analysing the polycyclic aromatic hydrocarbons (PAH) levels in bird eggs "given that they are easily detectable and are considered good biomonitors of pollution in this faunal group." For each egg, a study was carried out of 16 kinds of PAH classified as significant by the US Environmental Protection Agency due to their toxicity to marine organisms.
Samples were taken for four years in 10 of the species' breeding locations, nine of which are on the Galician coast beaches and one in Ra de Aveiro, Portugal. Sample areas were grouped together according to their distance from the Prestige oil spill. Three area types were established: less than 50 kilometres, between 50 and 200 kilometres, and more than 200 kilometres.
The Kentish Plover is the only wading bird that nests and breeds on Northern Spain's Atlantic Coast or, more precisely, in Galicia. This species shows signs of decline in various parts of Spain and Europe and is a priority for conservation in the European Union.
|Contact: Jesus Dominguez Conde|
FECYT - Spanish Foundation for Science and Technology