{"id":298,"date":"2020-05-12T11:23:28","date_gmt":"2020-05-12T09:23:28","guid":{"rendered":"http:\/\/www.val-de-marne-environnement.fr\/?p=298"},"modified":"2020-07-06T12:02:48","modified_gmt":"2020-07-06T10:02:48","slug":"contribution-de-joncs-marins-scot-mgp","status":"publish","type":"post","link":"https:\/\/www.fne94.fr\/index.php\/2020\/05\/12\/contribution-de-joncs-marins-scot-mgp\/","title":{"rendered":"Contribution de Joncs Marins – SCOT MGP"},"content":{"rendered":"\t\t
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Le chapelet des \u00eeles de la Marne et de la Seine au sein de la M\u00e9tropole : des \u00eelots de biodiversit\u00e9 \u00e0 pr\u00e9server <\/span><\/p>

Souvent situ\u00e9es dans des zones tr\u00e8s urbanis\u00e9es ou proches de celles-ci, de nombreuses \u00eeles de la Marne et de la Seine constituent des refuges uniques pour la faune et pour la flore outre le charme paysager qu’elles procurent aux riverains. <\/span><\/p>

Une importante biodiversit\u00e9 avec de nombreuses esp\u00e8ces prot\u00e9g\u00e9es a pu en effet s\u2019y d\u00e9velopper : de nombreux mammif\u00e8res et insectes dont certains sont tr\u00e8s rares au niveau mondial, ont pu y \u00eatre observ\u00e9s. Ce constat est valable pour les \u00eeles inhabit\u00e9es mais aussi pour les \u00eeles habit\u00e9es. <\/span><\/p>

Par ailleurs, les crues r\u00e9guli\u00e8res sont globalement favorables \u00e0 la biodiversit\u00e9 de ces \u00eeles via notamment les importants d\u00e9p\u00f4ts de limons qui permettent d\u2019accro\u00eetre la fertilit\u00e9 des sols (r\u00e9f\u00e9rence : https:\/\/www.geo.fr\/environnement\/les-crues-un-bain-de-jouvence-pour-la-biodiversite-184181<\/span><\/span><\/a> Gr\u00e9goire Lois, naturaliste pour l’Agence pour la biodiversit\u00e9 d’\u00eele-de-France) <\/span><\/p>

Aujourd’hui, dans la MGP, la pression fonci\u00e8re exceptionnelle li\u00e9e \u00e0 l’habitat mais aussi aux activit\u00e9s de loisirs constitue une importante menace pour la pr\u00e9servation de ces milieux. <\/span><\/p>

La biodiversit\u00e9 de ces \u00eeles et leur \u00e9quilibre sont donc plus que jamais fragiles et vuln\u00e9rables : les mesures de protections doivent \u00eatre renforc\u00e9es et le patrimoine naturel existant doit \u00eatre pr\u00e9serv\u00e9 voire \u00ab\u00a0sanctuaris\u00e9\u00a0\u00bb. Par ailleurs, une surveillance accrue et r\u00e9guli\u00e8re doit \u00eatre exerc\u00e9e afin de veiller au respect et \u00e0 l’application de ces mesures de protection et de la r\u00e9glementation (r\u00e9f\u00e9rence en page 9 du magazine \u00abLiaison\u00bb : http:\/\/fne-idf.fr\/PDF\/Liaison\/184.pdf#page=9<\/span><\/span><\/a> ) <\/span><\/p>

Il est \u00e0 noter que la richesse sp\u00e9cifique de ces territoires insulaires concerne \u00e0 la fois la faune et la flore et contribue \u00e0 l’\u00e9quilibre de notre territoire ainsi qu’\u00e0 la pr\u00e9vention des risques. Les habitants de ces iles sont tr\u00e8s souvent sensibilis\u00e9s \u00e0 ces risques de par les inondations ou l’\u00e9rosion des berges. <\/span><\/p>

A titre d’exemple, la v\u00e9g\u00e9tation des berges (ripisylve) joue un r\u00f4le essentiel non seulement pour la protection naturelle des terres et la r\u00e9gulation des crues mais aussi pour l’\u00e9puration de l’eau et l\u2019att\u00e9nuation du r\u00e9chauffement notamment en p\u00e9riode de canicule. Ce constat est d’autant plus vrai pour les \u00eeles de La Marne et de La Seine dont certaines ont pu \u00eatre pr\u00e9serv\u00e9es du fait qu’elles ne sont accessibles que par bateau. <\/span><\/p>

Autre exemple : associ\u00e9es au fleuve, les \u00eeles dont la flore a pu \u00eatre pr\u00e9serv\u00e9e, constituent des corridors qui permettent d’\u00e9purer les flux d’air. Au vu des probl\u00e8mes de qualit\u00e9 de l’air rencontr\u00e9 en \u00eele de France et des cons\u00e9quences sanitaires sur la population, la protection de ces \u00eeles constitue donc un enjeu essentiel (r\u00e9f\u00e9rence : https:\/\/blogs.mediapart.fr\/bernard-landau\/blog\/190918\/la-seine-couloir-de-ventilationde-paris<\/span><\/span><\/a> ). <\/span><\/p>

Recommandations <\/span><\/p>

1. Les espaces naturels sur les \u00eeles de la Marne et de la Seine devront \u00eatre pr\u00e9serv\u00e9s de toute expansion d’activit\u00e9 humaine qu\u2019elle soit li\u00e9e \u00e0 l\u2019habitat ou aux loisirs. <\/span><\/p>

2. Les mesures de surveillance et de vigilance sur le respect et l’application de la r\u00e9glementation de ces \u00eeles devront \u00eatre renforc\u00e9es. <\/span><\/p>

Joncs Marins Environnement 6 rue de l’Orangerie 94170 LE PERREUX-SUR-MARNE joncsmarinsenvironnement@gmail.com<\/span> <\/a><\/span><\/span><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Le chapelet des \u00eeles de la Marne et de la Seine au sein de la M\u00e9tropole : des \u00eelots de biodiversit\u00e9 \u00e0 pr\u00e9server Souvent situ\u00e9es dans des zones tr\u00e8s urbanis\u00e9es ou proches de celles-ci, de nombreuses \u00eeles de la Marne et de la Seine constituent des refuges uniques pour la faune et pour la flore 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