{"id":98445,"date":"2024-10-29T16:12:15","date_gmt":"2024-10-29T16:12:15","guid":{"rendered":"https:\/\/www.africa-press.net\/burkina-faso\/politique\/une-balise-gps-retrace-les-derniers-instants-dun-oiseau-migrateur-fauche-a-3000-m-daltitude-par-un-faucon"},"modified":"2024-10-29T16:58:58","modified_gmt":"2024-10-29T16:58:58","slug":"une-balise-gps-retrace-les-derniers-instants-dun-oiseau-migrateur-fauche-a-3000-m-daltitude-par-un-faucon","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/une-balise-gps-retrace-les-derniers-instants-dun-oiseau-migrateur-fauche-a-3000-m-daltitude-par-un-faucon","title":{"rendered":"Une balise GPS retrace les derniers instants d&rsquo;un oiseau migrateur, fauch\u00e9 \u00e0 3000 m d&rsquo;altitude par un faucon"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Burkina Faso. <\/strong><\/span>ertains oiseaux migrateurs volent a\u0300 des altitudes tre\u0300s e\u0301leve\u0301es, jusqu&rsquo;a\u0300 7000 m voire plus. Une hypothe\u0300se (non teste\u0301e) e\u0301tait avance\u0301e pour expliquer ce phe\u0301nome\u0300ne: ces oiseaux espe\u0300rent ainsi e\u0301viter les rencontres avec des pre\u0301dateurs. Mais cette the\u0301orie est mise a\u0300 mal par une nouvelle e\u0301tude mene\u0301e par des chercheurs ne\u0301erlandais.<\/p>\n<p>Si la migration offre des avantages non ne\u0301gligeables aux espe\u0300ces qui la pratiquent, elle reste dangereuse et peut e\u0302tre associe\u0301e a\u0300 un taux e\u0301leve\u0301 de mortalite\u0301. \u00ab\u00a0Un facteur important contribuant a\u0300 ces taux de mortalite\u0301 e\u0301leve\u0301s est le risque accru de pre\u0301dation pendant la migration\u00a0\u00bb, rappellent les auteurs de cette nouvelle e\u0301tude publie\u0301e le 7 octobre 2024 dans la revue Ecology.<\/p>\n<p>Concernant les oiseaux migrateurs, ce risque a surtout e\u0301te\u0301 e\u0301tudie\u0301 lorsque ceux-ci font une halte. Mais les oiseaux sont-ils pour autant en se\u0301curite\u0301 lorsqu&rsquo;ils volent me\u0302me a\u0300 haute altitude ? Un pluvier argente\u0301 (Pluvialis squatarola), oiseau migrant a\u0300 travers le nord de l&rsquo;Europe, a de\u0301montre\u0301, bien malgre\u0301 lui, que voler haut ne suffit pas.<\/p>\n<p><b>Un brutal changement de cap<\/b><\/p>\n<p>L&rsquo;oiseau e\u0301tait e\u0301quipe\u0301, comme plusieurs de ses conge\u0301ne\u0300res, d&rsquo;une balise GPS capable de donner des informations sur sa position, dont son altitude, mais aussi sur son acce\u0301le\u0301ration. Ces donne\u0301es permettaient aux chercheurs de suivre l&rsquo;animal a\u0300 la trace jour apre\u0300s jour.<\/p>\n<p>Ainsi, le 27 mai 2023 a\u0300 21h58, le volatile \u00ab\u00a0a soudainement arre\u0302te\u0301 son vol migratoire. Au me\u0302me moment, le signal d&rsquo;acce\u0301le\u0301ration corporelle du dispositif de suivi de ce pluvier a chute\u0301 fortement, passant de 1.45 a\u0300 0.27 g\u00a0\u00bb, relate l&rsquo;e\u0301tude. Deux minutes plus tard, le GPS enregistrait l&rsquo;altitude: 2882 m au-dessus du sol (environ 2900 m au-dessus du niveau de la mer). L&rsquo;outil a de\u0301voile\u0301 aussi un brutal changement de cap et une baisse de la vitesse de vol.<\/p>\n<p>Les positions suivantes sont reste\u0301es identiques: le GPS n&rsquo;a plus e\u0301mis que sur une me\u0302me position, a\u0300 8 km de la\u0300. \u00ab\u00a0La balise et les restes de l&rsquo;oiseau ont e\u0301te\u0301 trouve\u0301s a\u0300 moins de 200 m d&rsquo;un nid de pe\u0300lerin, sugge\u0301rant sans aucun doute que la pre\u0301dation par un faucon pe\u0300lerin e\u0301tait la cause du de\u0301ce\u0300s\u00a0\u00bb, notent les chercheurs.<\/p>\n<p><b>Voler a\u0300 3000 m d&rsquo;altitude ne permet pas d&rsquo;e\u0302tre en se\u0301curite\u0301<\/b><\/p>\n<p>Les donne\u0301es re\u0301ve\u0300lent que, durant 15 minutes avant 21h58, le malheureux pluvier argente\u0301 a acce\u0301le\u0301re\u0301 son vol, su\u0302rement pour e\u0301chapper au pre\u0301dateur. \u00ab\u00a0L&rsquo;e\u0301ve\u0301nement de pre\u0301dation observe\u0301 constitue un enregistrement exceptionnel de la chasse a\u0300 haute altitude par les faucons pe\u0300lerins\u00a0\u00bb, remarquent les chercheurs. Pour eux, en prenant en compte le de\u0301lai de l&rsquo;e\u0301mission de la position de l&rsquo;oiseau par le GPS, la pre\u0301dation a eu lieu au moins a\u0300 2882 m d&rsquo;altitude. Mais il est possible qu&rsquo;elle se soit produite plus haut encore.<\/p>\n<p>Existe-t-il une altitude a\u0300 partir de laquelle les oiseaux migrateurs sont en se\u0301curite\u0301 ? Si cette nouvelle e\u0301tude ne permet pas de re\u0301pondre a\u0300 cette question, elle re\u0301ve\u0300le tout de me\u0302me qu'\u00a0\u00bbaugmenter l&rsquo;altitude de vol jusqu&rsquo;a\u0300 3000 m au-dessus du sol n&rsquo;est clairement pas suffisant pour permettre aux oiseaux migrateurs d&rsquo;e\u0301viter les risques de pre\u0301dation\u00a0\u00bb. Au contraire, chasser a\u0300 haute altitude dans les couloirs de migration quand des proies sont disponibles pourrait e\u0302tre une \u00ab\u00a0strate\u0301gie rentable\u00a0\u00bb pour les rapaces.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la Burkina Faso, suivez Africa-Press<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Burkina Faso. ertains oiseaux migrateurs volent a\u0300 des altitudes tre\u0300s e\u0301leve\u0301es, jusqu&rsquo;a\u0300 7000 m voire plus. Une hypothe\u0300se (non teste\u0301e) e\u0301tait avance\u0301e pour expliquer ce phe\u0301nome\u0300ne: ces oiseaux espe\u0300rent ainsi e\u0301viter les rencontres avec des pre\u0301dateurs. Mais cette the\u0301orie est mise a\u0300 mal par une nouvelle e\u0301tude mene\u0301e par des chercheurs ne\u0301erlandais. Si [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":98444,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-98445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-burkina-faso"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Une balise GPS retrace les derniers instants d&#039;un oiseau migrateur, fauch\u00e9 \u00e0 3000 m d&#039;altitude par un faucon - Burkina Faso<\/title>\n<meta name=\"description\" content=\"ertains oiseaux migrateurs volent a\u0300 des altitudes tre\u0300s e\u0301leve\u0301es, jusqu&#039;a\u0300 7000 m voire plus. 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