La Seine moins polluée ?
Par Marc Migraine le vendredi 21 août 2009, 21:19 - Environnement - Santé - Lien permanent
Selon le journal Ouest-France et le Paris-Normandie, La qualité de l'eau de la Seine s'améliorerait. 2 raisons témoignent en faveur de cette amélioration :
le
retour du saumon et de l'éperlan
dans la seine. leur retour est consideré comme un signe de l'amélioration
de la qualité de l'eau de la Seine. - 32 espèces de poissons ont été dénombrées dans le fleuve contre 4 en 1995.
Grosso modo il y a plus d'oxygène, moins de rejets de phosphore, de
pesticides et de métaux mais plus de nitrates. La quantité d'hydrocarbures
reste assez importante. Il y aurait moins de poissons mais plus d'espèces
de poissons. c'est le paradoxe !
Globalement les eaux de la Seine s'améliorent mais le Fleuve reste un
des plus pollués de France à cause des rejets du bassin parisien,
du secteur industriel et agricole situés sur sa longueur et à
cause d'un courant assez faible.
NB : L'estuaire de la Seine est un milieu naturel passionnant, d'une richesse
incroyable. Vous trouverez en
cliquant ici les caractéristiques des 5 zones de l'estuaire de la seine.
Néanmoins la diminution des surfaces de vasières reste préoccupante.
Pour plus d'information sur la dégradation de l'estuaire de la seine
cliquez
ici.
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