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Ecologistas en Acción
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España, donde según la AEMA afecta a un 96% de los ecosistemas naturales, siendo el nordeste
y este peninsulares las zonas más afectadas.
En el agua, que recibe a la larga los nutrientes presentes en el suelo, la eutrofización provoca la
proliferación de algas, que acaban privando de luz a las plantas acuáticas del fondo y provocando
anoxia (falta de oxígeno), con la consecuente muerte de peces y animales acuáticos cuando estas
algas, en exceso, se descomponen. También el exceso de nitratos en el agua, que se filtran en el
suelo, causa graves problemas en las aguas subterráneas y, por tanto, en el suministro de agua
potable a muchas poblaciones.
En el medio terrestre las consecuencias de la eutrofización son también graves y se cree que,
a escala mundial, es una importante causa de extinción en el mundo vegetal ya que las plantas
nitrófilas (“amantes del nitrógeno”) acaban desplazando a multitud de especies vegetales me-
nos adaptadas a ambientes con exceso de nutrientes. La desaparición o el enrarecimiento de
las especies vegetales mal adaptadas al exceso de nitrógeno provocan a su vez cambios en los
ecosistemas que acaban afectando gravemente también a la fauna.
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