{"id":293207,"date":"2026-06-21T17:30:18","date_gmt":"2026-06-21T21:30:18","guid":{"rendered":"https:\/\/theequity.ca\/trois-lacs-de-thorne-exempts-de-myriophylle-selon-une-biologiste\/"},"modified":"2026-06-21T17:30:18","modified_gmt":"2026-06-21T21:30:18","slug":"trois-lacs-de-thorne-exempts-de-myriophylle-selon-une-biologiste","status":"publish","type":"post","link":"https:\/\/theequity.ca\/fr\/trois-lacs-de-thorne-exempts-de-myriophylle-selon-une-biologiste\/","title":{"rendered":"Trois lacs de Thorne exempts de myriophylle, selon une biologiste"},"content":{"rendered":"

Une \u00e9tude men\u00e9e en juillet sur trois lacs de Thorne les a trouv\u00e9s exempts de la plante envahissante, le myriophylle \u00e0 \u00e9pi, qui a \u00e9t\u00e9 d\u00e9tect\u00e9 dans certaines voies navigables du lac Otter voisin.<\/p>\n

L\u2019Association des propri\u00e9taires de chalets du lac Thorne (TLHOA) a accueilli la biologiste Annie Parent le 21 juillet pour analyser la pr\u00e9sence de la plante dans les lacs Thorne, Long et Killoran, qui n\u2019en a trouv\u00e9 aucune trace.<\/p>\n

\u00ab Nous \u00e9tions vraiment, vraiment heureux, car c\u2019est tr\u00e8s difficile de s\u2019en d\u00e9barrasser \u00bb, a d\u00e9clar\u00e9 Judy Hancock, pr\u00e9sidente de la TLHOA, \u00e0 propos du r\u00e9sultat.<\/p>\n

Le myriophylle \u00e0 \u00e9pi est une esp\u00e8ce envahissante commune qui se propage facilement, soit en introduisant des embarcations non lav\u00e9es avec des traces de la plante dans de nouveaux plans d\u2019eau, soit par les h\u00e9lices de bateaux qui d\u00e9coupent des morceaux de la plante et les dispersent.<\/p>\n

\u00ab [Il] prend la place des esp\u00e8ces indig\u00e8nes, c\u2019est donc un danger pour la biodiversit\u00e9 d\u2019un lac \u00bb, a d\u00e9clar\u00e9 Mme<\/sup> Parent, qui n\u2019est pas une experte du myriophylle, mais qui a constat\u00e9 son impact dans sa carri\u00e8re de biologiste aquatique.<\/p>\n

Elle a expliqu\u00e9 que la plante \u00e9touffe les autres esp\u00e8ces indig\u00e8nes du lac au point que rien ne peut lui faire concurrence. \u00ab Les plantes exotiques envahissantes n\u2019ont rien pour les emp\u00eacher de se reproduire. Il n\u2019y a pas de contr\u00f4leurs \u00bb, a-t-elle ajout\u00e9.<\/p>\n

Une \u00e9tude de 2023 command\u00e9e par la Municipalit\u00e9 du lac Otter, \u00e9galement men\u00e9e par Mme<\/sup> Parent, a d\u2019abord signal\u00e9 la pr\u00e9sence de la plante dans deux de ses lacs. L\u2019ann\u00e9e derni\u00e8re, une autre \u00e9tude a d\u00e9couvert la plante dans trois autres lacs.<\/p>\n

Le conseil municipal du lac Otter a depuis mis en \u0153uvre des solutions pour freiner la propagation de la plante, notamment en fermant sa rampe de mise \u00e0 l\u2019eau publique sur le lac Farm. Le conseil a adopt\u00e9 un r\u00e8glement en 2020 rendant le lavage des embarcations obligatoire avant de mettre toute embarcation dans un nouveau plan d\u2019eau.<\/p>\n

Mme<\/sup> Hancock a d\u00e9clar\u00e9 que si les lacs que son association dessert n\u2019ont pas de rampes de mise \u00e0 l\u2019eau publiques, l\u2019organisme voulait tout de m\u00eame \u00eatre proactif pour stopper la propagation de la plante.<\/p>\n

\u00ab Si cela peut arriver au lac Otter, cela peut arriver n\u2019importe o\u00f9 \u00bb, a-elle dit \u00e0 propos de l\u2019apparition de la plante dans la municipalit\u00e9 voisine. \u00ab Nous voulions [ . . . ] prendre les devants. \u00bb<\/p>

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Mme<\/sup> Parent a d\u00e9clar\u00e9 que, selon son exp\u00e9rience, prendre les devants est exactement ce que les r\u00e9sidents devraient faire, surtout dans les cas o\u00f9 il n\u2019y a pas de rampes de mise \u00e0 l\u2019eau publiques pour que la municipalit\u00e9 puisse surveiller.<\/p>\n

Elle a ajout\u00e9 que dans la Municipalit\u00e9 de Thorne et d\u2019autres municipalit\u00e9s qui n\u2019ont pas autant de rampes de mise \u00e0 l\u2019eau publiques, l\u2019introduction de nouvelles embarcations peut rendre ces lacs plus vuln\u00e9rables aux esp\u00e8ces envahissantes.<\/p>\n

\u00ab C\u2019est ce qui est dangereux pour les petits lacs qui n\u2019ont pas de rampe de mise \u00e0 l\u2019eau publique \u2014 il n\u2019y a pas de lavage de bateaux, pas de surveillance, il n\u2019y a absolument rien. \u00bb<\/p>\n

Elle a expliqu\u00e9 que le myriophylle, s\u2019il n\u2019est pas trait\u00e9, peut devenir tr\u00e8s dense \u00e0 la surface de l\u2019eau et nuire \u00e0 tout type de jouissance du lac, comme cela a \u00e9t\u00e9 le cas dans de nombreux lacs qu\u2019elle a \u00e9tudi\u00e9s au fil des ans.<\/p>\n

\u00ab Il \u00e9tait impossible pour les gens de se baigner, il y avait trop de [myriophylle]. Les grandes tiges peuvent s\u2019enrouler autour de vos pieds et cela peut \u00eatre dangereux. \u00bb<\/p>\n

Mme<\/sup> Hancock a d\u00e9clar\u00e9 que c\u2019est exactement ce genre de situation que son organisation veut \u00e9viter. Elle a ajout\u00e9 qu\u2019en distribuant des d\u00e9pliants et en commandant cette \u00e9tude, ils esp\u00e8rent informer leurs voisins sur les risques que la plante pourrait poser \u00e0 leurs refuges d\u2019\u00e9t\u00e9.<\/p>\n

\u00ab Tout le monde veut s\u2019assurer de faire preuve de diligence raisonnable, car ces chalets sont des propri\u00e9t\u00e9s patrimoniales [ . . .] Les gens veulent donc vraiment pr\u00e9server la flore et la faune. Ils veulent pr\u00e9server l\u2019air et l\u2019eau afin que leurs enfants et petits-enfants puissent en profiter \u00bb, a-t-elle dit.<\/p>\n

Mme<\/sup> Parent a d\u00e9clar\u00e9 que m\u00eame si le test de myriophylle est revenu n\u00e9gatif, le travail ne s\u2019arr\u00eate pas l\u00e0 pour la TLHOA \u2014 les propri\u00e9taires de chalets doivent toujours \u00eatre vigilants quant \u00e0 ceux qui entrent et sortent de l\u2019eau sur leur propri\u00e9t\u00e9 et s\u2019assurer qu\u2019ils nettoient correctement leur embarcation.<\/p>

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\u00ab Pour les utilisateurs qui mettent leur bateau au printemps et le sortent \u00e0 l\u2019automne [ . . . ] ce ne sont pas eux qui vont introduire le myriophylle. La famille, les amis et [ . . . ] les gens qui permettent \u00e0 d\u2019autres de mettre leur bateau \u00e0 l\u2019eau. C\u2019est l\u00e0 que se trouve le risque. \u00bb<\/p>\n

Mme<\/sup> Hancock a d\u00e9clar\u00e9 qu\u2019elle allait communiquer ce message aux membres de son association et encourage \u00e9galement d\u2019autres associations de lacs \u00e0 faire de m\u00eame. Elle a ajout\u00e9 qu\u2019elle porterait \u00e9galement la question \u00e0 la municipalit\u00e9 pour voir si elle peut faire quelque chose pour sensibiliser le public \u00e0 cette question.<\/p>\n

Mme<\/sup> Parent a d\u00e9clar\u00e9 que les r\u00e9sidents peuvent \u00e9galement effectuer des v\u00e9rifications visuelles de routine pour voir s\u2019il y a du myriophylle sur le lac.<\/p>\n

Un guide cr\u00e9\u00e9 par l\u2019organisation environnementale locale Garde-rivi\u00e8re des Outaouais offre des conseils pour identifier le myriophylle \u00e0 \u00e9pi, ainsi que d\u2019autres esp\u00e8ces envahissantes communes dans le bassin versant de la rivi\u00e8re des Outaouais. Il peut \u00eatre consult\u00e9 en visitant le site web de Garde-rivi\u00e8re des Outaouais et en recherchant \u00ab Esp\u00e8ces envahissantes dans les r\u00e9gions du Qu\u00e9bec du bassin versant de la rivi\u00e8re des Outaouais \u00bb.<\/p>\n","protected":false},"excerpt":{"rendered":"

Une \u00e9tude men\u00e9e en juillet sur trois lacs de Thorne les a trouv\u00e9s exempts de la plante envahissante, le myriophylle \u00e0 \u00e9pi, qui a \u00e9t\u00e9 d\u00e9tect\u00e9 dans certaines voies navigables du lac Otter voisin. L\u2019Association des propri\u00e9taires de chalets du lac Thorne (TLHOA) a accueilli la biologiste Annie Parent le 21 juillet pour analyser la […]<\/p>\n","protected":false},"author":17,"featured_media":272697,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1671,6,1712,1717,1675],"tags":[3913,3915,1430,3916,3914,1351,1172,1198],"class_list":["post-293207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education-fr","category-news","category-otter-lake","category-thorne","category-tourism-fr","tag-annie-parent","tag-association-des-proprietaires-de-chalets-du-lac-thorne","tag-environment","tag-garde-riviere-des-outaouais","tag-judy-hancock","tag-milfoil","tag-otter-lake","tag-thorne"],"featured_image_src":"https:\/\/theequity.ca\/wp-content\/uploads\/07-30_ThorneNoMilfoil1-1024x576.jpg","blog_images":{"medium":"https:\/\/theequity.ca\/wp-content\/uploads\/07-30_ThorneNoMilfoil1-300x169.jpg","large":"https:\/\/theequity.ca\/wp-content\/uploads\/07-30_ThorneNoMilfoil1-1024x576.jpg"},"acf":[],"ams_acf":[{"key":"subheading","label":"Subheading","value":""},{"key":"story_order","label":"Priority","value":"6"}],"yoast_head":"\nTrois lacs de Thorne exempts de myriophylle, selon une biologiste - The Equity<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/theequity.ca\/fr\/trois-lacs-de-thorne-exempts-de-myriophylle-selon-une-biologiste\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Trois lacs de Thorne exempts de myriophylle, selon une biologiste - The Equity\" \/>\n<meta property=\"og:description\" content=\"Une \u00e9tude men\u00e9e en juillet sur trois lacs de Thorne les a trouv\u00e9s exempts de la plante envahissante, le myriophylle \u00e0 \u00e9pi, qui a \u00e9t\u00e9 d\u00e9tect\u00e9 dans certaines voies navigables du lac Otter voisin. 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