{"id":1188879,"date":"2022-12-11T10:34:36","date_gmt":"2022-12-11T09:34:36","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=1188879"},"modified":"2024-01-26T18:26:00","modified_gmt":"2024-01-26T17:26:00","slug":"nature-des-microalgues-somptueuses-accelerant-la-fonte-des-glaces-decouvertes-a-differents-endroits-du-globe","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/nature-des-microalgues-somptueuses-accelerant-la-fonte-des-glaces-decouvertes-a-differents-endroits-du-globe\/","title":{"rendered":"R\u00e9chauffement climatique\u00a0: de magnifiques algues color\u00e9es envahissent la plan\u00e8te et pr\u00e9cipitent la fonte des glaces"},"content":{"rendered":"\n
\"Le
Le \u00ab sang des glaciers \u00bb ou neige rouge sur le mont Ritter, l’une de ces microalgues responsables de la fonte des glaces d\u00e9couvertes \u00e0 diff\u00e9rents endroits du globe \u00a9 Wikimedia Commons, domaine public<\/figcaption><\/figure>\n\n\n\n

Si les panoramas sont magnifiques, les cons\u00e9quences pour la plan\u00e8te seraient, elles, d\u00e9sastreuses. Rouge, violet, rose ou vert, peu importe la couleur, les \u00e9tudes m\u00e8nent aux m\u00eames r\u00e9sultats. La pr\u00e9sence de ces algues color\u00e9es<\/strong>, en forte hausse depuis quelques ann\u00e9es, est un tr\u00e8s mauvais signe <\/strong>pour le monde polaire. Elles sont microscopiques, <\/strong>mais pourraient bien faire des d\u00e9g\u00e2ts gigantesques. En effet, ces derni\u00e8res acc\u00e9l\u00e8rent la disparition des glaciers<\/strong> et menacent des \u00e9cosyst\u00e8mes et des populations toutes enti\u00e8res<\/a>.<\/p>\n\n\n\n

Algues color\u00e9es d\u00e9couvertes sur les glaciers : un effet boule de neige pour la temp\u00e9rature de notre plan\u00e8te<\/h2>\n\n\n\n

Elles se sont multipli\u00e9es ces derni\u00e8res ann\u00e9es en raison de la hausse globale des temp\u00e9ratures<\/a>. N\u00e9cessitant un peu d\u2019eau et de chaleur, elles ont trouv\u00e9, sur les glaciers, un habitat parfait <\/strong>pour leur prolif\u00e9ration. Si les couleurs sont spectaculaires<\/strong> pour les randonneurs ou alpinistes, elles provoquent un \u00ab\u00a0cercle vicieux \u00e9cologique \u00bb d\u00e9sastreux. <\/p>\n\n\n\n

En raison de l\u2019assombrissement de leur surface, les glaciers doivent, en effet, absorber davantage de lumi\u00e8re solaire<\/strong>. Cette absorption accrue provoque ainsi une hausse de la vitesse de la fonte de la glace<\/strong>. En d\u2019autres termes, c\u2019est le changement des temp\u00e9ratures qui a permis l\u2019arriv\u00e9e de ces algues <\/strong>dans ces \u00e9cosyst\u00e8mes si particuliers, et ce sont ces algues qui vont participer, indirectement, \u00e0 l\u2019acc\u00e9l\u00e9ration du r\u00e9chauffement des glaciers<\/strong>. Un effet boule de neige, qui n\u2019annonce rien de bon pour notre ch\u00e8re plan\u00e8te.<\/p>\n\n\n\n

\u00c0 lire : Et si on manipulait le climat pour stopper la fonte des glaces ?<\/a><\/strong><\/p>\n\n\n\n

De plus, peu de choses sont connues sur ces micro-organismes. Bien qu’elles soient tr\u00e8s anciennes <\/strong>(la pr\u00e9sence d\u2019algues sur certains glaciers avait d\u00e9j\u00e0 \u00e9t\u00e9 \u00e9voqu\u00e9e par Aristote), la science <\/strong>ne semble s\u2019y int\u00e9resser <\/strong>r\u00e9ellement que depuis quelques d\u00e9cennies. <\/p>\n\n\n\n

On explique <\/strong>par exemple, depuis peu, que la couleur des algues est un m\u00e9canisme de protection <\/strong>de ces derni\u00e8res face aux rayons UV <\/strong>du soleil. Une caract\u00e9ristique scientifique qui serait int\u00e9ressante \u00e0 \u00e9tudier. Cependant, le temps semble \u00e9galement compt\u00e9. En effet, \u00e0 mesure que les glaciers disparaissent, <\/strong>ce sont aussi tous les micro-organismes, la faune et la flore polaire qui sont menac\u00e9s. Et ces algues en font partie.<\/p>\n\n\n\n

Source : businessinsider.com <\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c0 divers endroits du globe, des myst\u00e9rieuses algues rouges, violettes, roses ou vertes ont \u00e9t\u00e9 d\u00e9couvertes sur certains glaciers. 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