Levels of polychlorinated biphenyls, organochlorine pesticides, mercury and lead in relation to shell thickness in marsh harrier (Circus aeruginosus) eggs from Charente-Maritime, France

bifenilos policlorados contaminantes contaminants dde ddt efectos secundarios effet secondaire france francia mercure mercurio mercury nontarget effects organochlorine compounds pesticide pesticides plaguicidas polluant pollutants polychlorinated biphenyls side effects