{"id":5982,"date":"2022-12-07T07:21:23","date_gmt":"2022-12-07T06:21:23","guid":{"rendered":"http:\/\/www.photorama.be\/wordpress\/?p=5982"},"modified":"2022-12-07T16:55:52","modified_gmt":"2022-12-07T15:55:52","slug":"sterne-arctique","status":"publish","type":"post","link":"https:\/\/www.photorama.be\/wordpress\/sterne-arctique\/","title":{"rendered":"71000 Km !!!"},"content":{"rendered":"\n

Quand on parle d\u2019oiseaux migrateurs, ce sont les grues qui viennent souvent \u00e0 l\u2019esprit. Pourtant elles sont loin de d\u00e9tenir le record de la plus longue distance parcourue.<\/p>\n\n\n\n

En effet c\u2019est la sterne arctique qui d\u00e9tient le record de la migration la plus longue avec\u2026 71000 km effectu\u00e9s par an !<\/p>\n\n\n\n

C\u2019est une \u00e9quipe de recherche internationale qui gr\u00e2ce \u00e0 un mini appareil de geo-tracking, a pu cartographier cet incroyable trajet.<\/p>\n\n\n\n

Sachant que cet oiseau peut vivre presque 30 ans\u2026 c\u2019est 2,4 millions de kilom\u00e8tres qui sont parcourus soit 3 aller-retours vers la lune.<\/p>\n\n\n

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Comme le montre la carte ci-jointe, les sternes volent en zigzag et s’arr\u00eatent souvent un mois dans les eaux poissonneuses de l’Atlantique nord, s\u00fbrement pour faire le plein avant de traverser les autres r\u00e9gions, plus pauvres.<\/p>\n\n\n\n

Les oiseaux passent l’hiver dans les eaux de l’Antarctique et retournent au printemps vers le Groenland. Cette fois-ci encore, leur parcours est singulier puisqu’il prend la forme d’un \u00ab S \u00bb avec des d\u00e9tours de plusieurs milliers de kilom\u00e8tres.<\/p>\n\n\n\n

Selon l’\u00e9tude, les sternes profitent des vents dominants pour \u00e9conomiser leur \u00e9nergie. Comme ces vents sont d\u00e9vi\u00e9s vers la gauche dans l’h\u00e9misph\u00e8re sud et vers la droite dans l’h\u00e9misph\u00e8re nord, leur trajectoire adopte cette forme de \u00ab S \u00bb centr\u00e9e sur l’Equateur.<\/p>\n\n\n\n

Je vous propose donc de d\u00e9couvrir ces beaux oiseaux via quelques photos que j\u2019ai pu r\u00e9aliser.<\/p>\n\n\n\n

Enfin, une sterne arctique p\u00e8se \u00e0 peine 80 \u00e0 120 grammes pour une envergure  de 76 \u00e0 85 cm et une longueur de +\/- 36cm, ce qui rend d\u2019autant plus incroyable ce record.<\/p>\n\n\n\n

Source : Futura science<\/p>\n\n\n\n

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Quand on parle d\u2019oiseaux migrateurs, ce sont les grues qui viennent souvent \u00e0 l\u2019esprit. Pourtant elles sont loin de d\u00e9tenir le record de la plus longue distance parcourue. En effet c\u2019est la sterne arctique qui d\u00e9tient le record de la migration la plus longue avec\u2026 71000 km effectu\u00e9s par an ! C\u2019est une \u00e9quipe de recherche […]<\/p>\n","protected":false},"author":2,"featured_media":6003,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[1],"tags":[59,60,12,62,63,39,34,61],"jetpack_publicize_connections":[],"yoast_head":"\n71000 Km !!! - La nature en images<\/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:\/\/www.photorama.be\/wordpress\/sterne-arctique\/\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Christian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.photorama.be\/wordpress\/sterne-arctique\/\",\"url\":\"https:\/\/www.photorama.be\/wordpress\/sterne-arctique\/\",\"name\":\"71000 Km !!! 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