{"id":10888,"date":"2023-12-26T14:03:38","date_gmt":"2023-12-26T14:03:38","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/les-rennes-peuvent-ruminer-en-meme-temps-quils-dorment"},"modified":"2023-12-26T15:41:25","modified_gmt":"2023-12-26T15:41:25","slug":"les-rennes-peuvent-ruminer-en-meme-temps-quils-dorment","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/les-rennes-peuvent-ruminer-en-meme-temps-quils-dorment","title":{"rendered":"Les rennes peuvent ruminer en m\u00eame temps qu\u2019ils dorment"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>C\u2019est dans une e\u0301table en Norve\u0300ge que la neuroscientifique a\u0300 l\u2019Universite\u0301 de Zurich, Melanie Furrer, et son e\u0301quipe ont mesure\u0301 l\u2019activite\u0301 du cerveau de plusieurs rennes. D\u2019apre\u0300s leurs travaux, les ondes ce\u0301re\u0301brales de ces ruminants du grand froid indiquaient une phase de sommeil lent, alors me\u0302me qu\u2019ils e\u0301taient en train de rema\u0302cher les aliments pre\u0301dige\u0301re\u0301s dans leur panse. Leur e\u0301tude, publie\u0301e le 22 de\u0301cembre 2023 dans la revue Current Biology, met en lumie\u0300re cette e\u0301trange de\u0301couverte.<\/p>\n<p><b>Sommeil lent et rumination des rennes<\/b><\/p>\n<p>Au de\u0301part, des chercheurs de l\u2019Universite\u0301 de Zurich (Suisse) avaient de\u0301cide\u0301 d\u2019e\u0301tudier l\u2019influence des cycles dits \u201ccircadiens\u201d sur les habitudes de sommeil des rennes en fonction des saisons. Car en Arctique, l\u2019alternance lumie\u0300re-obscurite\u0301 est absente a\u0300 la fois en hiver, lorsque le soleil ne se le\u0300ve plus, et en e\u0301te\u0301, lorsqu\u2019au contraire, l\u2019astre ne se couche plus (\u201csoleil de minuit\u201d).<\/p>\n<p>Pour e\u0301valuer la quantite\u0301 et la qualite\u0301 du sommeil de ces ruminants du grand froid, les chercheurs sont alle\u0301s a\u0300 Troms\u00f8, une ville du nord de la Norve\u0300ge. Ici, ils ont fait passer un e\u0301lectroence\u0301phalographe (EEG) \u2013 une mesure, non invasive, de l\u2019activite\u0301 e\u0301lectrique du cerveau \u2013 a\u0300 un troupeau de femelles adultes rennes de l\u2019Universite\u0301 arctique de Norve\u0300ge (UiT).<\/p>\n<p>Ces mesures ont e\u0301te\u0301 effectue\u0301es au moment de l\u2019e\u0301quinoxe d\u2019automne, du solstice d\u2019e\u0301te\u0301 et du solstice d\u2019hiver, dans des e\u0301tables avec un e\u0301clairage contro\u0302le\u0301, de la nourriture a\u0300 volonte\u0301 et une tempe\u0301rature constante. Melanie Furrer et son e\u0301quipe ont constate\u0301 que les rennes dormaient a\u0300 peu pre\u0300s autant en hiver, en e\u0301te\u0301 et en automne, bien qu\u2019ils soient beaucoup plus actifs en e\u0301te\u0301. Mais le plus e\u0301tonnant e\u0301tait ailleurs.<\/p>\n<p>En effet, les chercheurs ont pu e\u0301tablir que des rennes en train de ruminer, c\u2019est-a\u0300-dire en train de remastiquer les aliments pre\u0301dige\u0301re\u0301s dans leur panse, pre\u0301sentaient des ondes ce\u0301re\u0301brales re\u0301ve\u0301latrices d\u2019une phase dite de \u201csommeil a\u0300 ondes lentes\u201d. Sur une pe\u0301riode donne\u0301e de 24 heures, les rennes ont passe\u0301 en moyenne 5,4 heures en sommeil a\u0300 ondes lentes (dit \u201cNon-REM\u201d en anglais), 0,9 heure en sommeil paradoxal \u2013 ou\u0300 se produisent les fameux \u201cmouvements rapides des yeux\u201d (dit \u201cREM\u201d pour rapid-eye-movement, en anglais) \u2013 et 2,9 heures a\u0300 ruminer, quelle que soit la saison.<\/p>\n<p><b>\u201cGagner du temps\u201d<\/b><\/p>\n<p>Par ailleurs, les rennes qui dormaient et ceux qui ruminaient avaient un comportement similaire : non seulement ils avaient tendance a\u0300 rester \u201ctranquillement assis ou debout\u201d pendant les deux activite\u0301s, mais ils se montraient aussi moins re\u0301actifs aux perturbations, comme le fait qu\u2019un renne se le\u0300ve ou s\u2019asseye a\u0300 co\u0302te\u0301 d\u2019eux.<\/p>\n<p>\u201cPlus les rennes ruminent, moins ils ont besoin de sommeil a\u0300 ondes lentes supple\u0301mentaire\u201d, explique dans un communique\u0301 Melanie Furrer, principale autrice de l\u2019e\u0301tude et neuroscientifique a\u0300 l\u2019Universite\u0301 de Zurich. \u201cNous pensons que cela leur permet de gagner du temps en couvrant leurs besoins de sommeil et de digestion en me\u0302me temps, en particulier pendant les mois d\u2019e\u0301te\u0301\u201d.<\/p>\n<p>En effet, les chercheurs supposent que cette activite\u0301 \u201cmultita\u0302che\u201d aide les rennes a\u0300 dormir suffisamment pendant les mois d\u2019e\u0301te\u0301 arctique, lorsque la nourriture est abondante et que ces animaux \u201cse nourrissent presque 24 heures sur 24, 7 jours sur 7\u201d, en pre\u0301vision de l\u2019hiver arctique \u2013 long et pauvre en nourriture. Surtout que \u201cla rumination augmente l\u2019absorption des nutriments\u201d, note la chercheuse. \u201cIl est donc essentiel que les rennes passent suffisamment de temps a\u0300 ruminer pendant l\u2019e\u0301te\u0301 pour prendre du poids en pre\u0301vision de l\u2019hiver\u201d.<\/p>\n<p>La prochaine e\u0301tape devrait consister a\u0300 comparer l\u2019impact de la rumination pendant le sommeil a\u0300 celui de la rumination pendant l\u2019e\u0301veil \u2013 car les rennes qui ruminent ne dorment pas toujours. \u201cNous savons aussi que le besoin de sommeil est beaucoup plus e\u0301leve\u0301 chez les jeunes enfants et les be\u0301be\u0301s que chez les adultes, il serait donc inte\u0301ressant d\u2019e\u0301tudier le sommeil chez les jeunes rennes\u201d, conclut Melanie Furrer.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. C\u2019est dans une e\u0301table en Norve\u0300ge que la neuroscientifique a\u0300 l\u2019Universite\u0301 de Zurich, Melanie Furrer, et son e\u0301quipe ont mesure\u0301 l\u2019activite\u0301 du cerveau de plusieurs rennes. D\u2019apre\u0300s leurs travaux, les ondes ce\u0301re\u0301brales de ces ruminants du grand froid indiquaient une phase de sommeil lent, alors me\u0302me qu\u2019ils e\u0301taient en [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":10887,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10888","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"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>Les rennes peuvent ruminer en m\u00eame temps qu\u2019ils dorment - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"C\u2019est 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