{"id":10105,"date":"2025-08-15T12:50:26","date_gmt":"2025-08-15T12:50:26","guid":{"rendered":"https:\/\/hurghada-today.com\/?p=10105"},"modified":"2025-11-04T16:22:33","modified_gmt":"2025-11-04T16:22:33","slug":"why-whales-and-dolphins-cant-survive-ashore","status":"publish","type":"post","link":"https:\/\/hurghada-today.com\/fr\/why-whales-and-dolphins-cant-survive-ashore\/","title":{"rendered":"Pourquoi les baleines et les dauphins ne peuvent-ils pas survivre \u00e0 terre ?"},"content":{"rendered":"

On tombe souvent sur des photos et des vid\u00e9os d\u00e9chirantes de baleines ou de dauphins massifs \u00e9chou\u00e9s, impuissants, sur des plages de sable fin, tandis que des gens se pr\u00e9cipitent pour leur venir en aide. \u00e9claboussures d'eau<\/a> sur eux, ou en essayant de les repousser \u00e0 la mer. Et une question se pose \u00e0 chaque fois: Pourquoi les baleines et les dauphins meurent-ils ? <\/strong>quand quittent-ils l'oc\u00e9an ? <\/strong>Ces mammif\u00e8res ne respirent-ils pas de l'air comme nous ? S'ils peuvent respirer l'oxyg\u00e8ne de l'air, pourquoi ne peuvent-ils pas survivre hors de l'eau ?<\/p>\n

Dans cet article, nous explorerons les raisons scientifiques de ce ph\u00e9nom\u00e8ne myst\u00e9rieux \u2014 de la fa\u00e7on dont ces mammif\u00e8res marins respirent aux facteurs biologiques et environnementaux qui entra\u00eenent leur mort lorsqu'ils s'\u00e9chouent.<\/div>\n

 <\/p>\n

\"A
Que dit la science \u00e0 propos de cet \u00e9v\u00e9nement myst\u00e9rieux ?<\/figcaption><\/figure>\n

Comment les baleines et les dauphins respirent-ils ?<\/strong><\/h2>\n

Contrairement aux poissons, qui extraient l'oxyg\u00e8ne de l'eau gr\u00e2ce \u00e0 leurs branchies, les baleines et les dauphins sont mammif\u00e8res marins<\/em> Ces animaux respirent l'oxyg\u00e8ne atmosph\u00e9rique gr\u00e2ce \u00e0 leurs poumons. Ils poss\u00e8dent un orifice sp\u00e9cial sur le dessus de leur t\u00eate, appel\u00e9 \u00e9vent, qui fonctionne comme un nez. Cet orifice leur permet d'inspirer de l'air et d'expirer du dioxyde de carbone. Pendant les plong\u00e9es<\/a>L'\u00e9vent reste herm\u00e9tiquement ferm\u00e9 par de puissants muscles pour emp\u00eacher l'eau de p\u00e9n\u00e9trer dans le syst\u00e8me respiratoire. Lorsque les baleines font surface, elles ouvrent l'\u00e9vent et expulsent un puissant jet d'air et de vapeur avant de prendre une grande inspiration et de replonger. Vous avez probablement d\u00e9j\u00e0 vu ce fameux jet d'air, semblable \u00e0 une fontaine, en photo.<\/p>\n

Combien de temps peuvent-ils rester sous l'eau ?<\/strong><\/h2>\n

Les dauphins peuvent g\u00e9n\u00e9ralement retenir leur respiration pendant 8 \u00e0 15 minutes, tandis que les grandes baleines peuvent rester immerg\u00e9es jusqu'\u00e0 60 minutes. Le record est toutefois d\u00e9tenu par la baleine \u00e0 bec de Cuvier, qui peut plonger pendant plus de 60 minutes. deux heures et quinze minutes<\/strong> En une seule inspiration ! Cette capacit\u00e9 provient de leurs fortes concentrations d'h\u00e9moglobine et de myoglobine \u2014 deux prot\u00e9ines qui stockent l'oxyg\u00e8ne dans le sang et les muscles \u2014 et de leur capacit\u00e9 \u00e0 ralentir leur rythme cardiaque lors des plong\u00e9es profondes afin de conserver l'oxyg\u00e8ne.<\/p>\n

\"A
Les baleines et les dauphins poss\u00e8dent une ouverture sp\u00e9ciale sur le dessus de leur t\u00eate appel\u00e9e \u00e9vent.<\/figcaption><\/figure>\n

S\u2019ils respirent de l\u2019air, pourquoi meurent-ils sur terre ?<\/strong><\/h2>\n

Les baleines et les dauphins ne meurent pas imm\u00e9diatement d'asphyxie lorsqu'ils sont hors de l'eau, car ils respirent par leur \u00e9vent et, techniquement, ils peuvent toujours inspirer et expirer \u00e0 l'air libre. Cependant, ils finissent par mourir s'ils restent \u00e9chou\u00e9s. mais pas principalement<\/strong> parce qu'ils ne peuvent pas respirer. Les v\u00e9ritables causes sont les suivantes\u00a0:<\/p>\n

1. Le poids \u00e9crasant et la pression interne sont mortels pour les baleines et les dauphins.<\/h3>\n

Une baleine bleue peut peser plus de 150 tonnes (150 000 kilogrammes)<\/em>Dans l'eau, la flottabilit\u00e9 supporte le poids consid\u00e9rable de son corps. Mais une fois \u00e0 terre, la gravit\u00e9 exerce une pression maximale sur ses organes, notamment les poumons et le c\u0153ur, pouvant entra\u00eener leur affaissement ou leur arr\u00eat. Son squelette n'est pas con\u00e7u pour supporter un tel poids hors de l'eau, ce qui provoque des l\u00e9sions internes mortelles.<\/p>\n

2. Surchauffe et contraintes thermiques<\/h3>\n

Les baleines et les dauphins poss\u00e8dent une \u00e9paisse couche de graisse appel\u00e9e lard, qui peut atteindre 30 centim\u00e8tres d'\u00e9paisseur<\/strong> Elle leur sert d'isolant contre les eaux froides de l'oc\u00e9an. Cependant, cette m\u00eame isolation devient dangereuse sur terre, o\u00f9 l'eau ne permet pas de refroidir leur corps. Leur temp\u00e9rature interne augmente rapidement, entra\u00eenant un stress thermique, des l\u00e9sions tissulaires et une d\u00e9shydratation.<\/p>\n

\"A
Les baleines et les dauphins poss\u00e8dent une \u00e9paisse couche de graisse qui les maintient au chaud dans les mers froides.<\/figcaption><\/figure>\n

3. D\u00e9shydratation et l\u00e9sions cutan\u00e9es<\/h3>\n

Leur peau est adapt\u00e9e pour rester constamment humide. Une fois expos\u00e9e \u00e0 l'air, elle commence \u00e0 s\u00e9cher, se fissurer et perdre de l'humidit\u00e9<\/em> rapidement. C'est pourquoi on voit souvent les sauveteurs. pulv\u00e9riser de l'eau<\/a> ou encore recouvrir les baleines de linges humides \u2014 pour les maintenir hydrat\u00e9es jusqu'\u00e0 ce qu'elles puissent retourner \u00e0 l'oc\u00e9an.<\/p>\n

4. Mobilit\u00e9 r\u00e9duite et \u00e9puisement physique<\/h3>\n

Les baleines et les dauphins ont corps profil\u00e9s<\/strong> Con\u00e7us pour une nage efficace, ces animaux se r\u00e9v\u00e8lent, sur terre, un handicap\u00a0: incapables de se d\u00e9placer ou de se soutenir, ils souffrent de fatigue musculaire, de l\u00e9sions par compression et, finalement, d\u2019\u00e9puisement mortel.<\/p>\n

5. Famine et \u00e9puisement \u00e9nerg\u00e9tique<\/h3>\n

Ces g\u00e9ants ont des besoins \u00e9nerg\u00e9tiques \u00e9normes. Une baleine bleue, par exemple, consomme environ 40 millions de krill par jour <\/em>\u2014 environ 2 \u00e0 101 TP3T de son poids corporel. Une fois \u00e9chou\u00e9s, ils n'ont plus acc\u00e8s \u00e0 la nourriture et s'\u00e9puisent rapidement, ce qui entra\u00eene la famine.<\/p>\n

\"bluewhale
Une baleine bleue se nourrissant de krill pr\u00e8s de la surface de l'oc\u00e9an.<\/figcaption><\/figure>\n

Pourquoi les baleines s'\u00e9chouent-elles sur les plages ?<\/h2>\n

Les \u00e9chouages de baleines et de dauphins sont document\u00e9s depuis des si\u00e8cles \u2014 avec environ 2\u00a0000 incidents recens\u00e9s chaque ann\u00e9e dans le monde. Pourtant, la cause exacte demeure l\u2019un des grands myst\u00e8res de la biologie marine. Parmi les principales th\u00e9ories, on peut citer\u00a0:<\/p>\n

    \n
  1. \n

    Maladie ou vieillesse :<\/strong> Les baleines malades ou \u00e2g\u00e9es peuvent s'isoler d\u00e9lib\u00e9r\u00e9ment et d\u00e9river vers le rivage pour y mourir paisiblement.<\/p>\n<\/li>\n

  2. \n

    Perturbations g\u00e9ologiques :<\/strong> Les s\u00e9ismes sous-marins ou l'activit\u00e9 volcanique peuvent perturber leurs syst\u00e8mes de navigation.<\/p>\n<\/li>\n

  3. \n

    Interf\u00e9rences humaines et bruit sonar\u00a0:<\/strong> Les sonars navals \u00e9mettent de puissantes ondes sonores qui peuvent d\u00e9sorienter les baleines et les amener \u00e0 fuir dans la mauvaise direction, souvent vers les eaux peu profondes. Un exemple c\u00e9l\u00e8bre s'est produit en 2000 aux Bahamas, lorsque 17 baleines se sont \u00e9chou\u00e9es peu apr\u00e8s un essai de sonar de la marine am\u00e9ricaine.<\/p>\n<\/li>\n<\/ol>\n

     <\/p>\n

    \"whale
    Des b\u00e9n\u00e9voles versent de l'eau sur une baleine \u00e9chou\u00e9e pour la rafra\u00eechir.<\/figcaption><\/figure>\n

    \u00a0Que faire lorsqu'une baleine s'\u00e9choue ?<\/h2>\n

    Lorsqu'une baleine ou un dauphin \u00e9chou\u00e9 est d\u00e9couvert, chaque seconde compte. Les sauveteurs s'empressent de maintenir la peau de l'animal humide \u00e0 l'aide de seaux d'eau de mer ou de linges mouill\u00e9s. Des serviettes ou des couvertures humides sont d\u00e9licatement pos\u00e9es sur son corps pour \u00e9viter que sa peau ne surchauffe ou ne se dess\u00e8che. Ensuite, ils ajustent la position de l'animal, soulageant ainsi son poitrail et ses nageoires pour faciliter sa respiration. Tout au long de l'op\u00e9ration, ils doivent rester calmes et silencieux\u00a0: le moindre bruit pourrait provoquer la panique. sauvetage en mer<\/a> Il convient de contacter les autorit\u00e9s afin qu'elles organisent la mise \u00e0 disposition de mat\u00e9riel professionnel et un retour en mer en toute s\u00e9curit\u00e9.<\/p>\n

    \"whale
    Des \u00e9quipes de sauvetage portent assistance aux baleines \u00e9chou\u00e9es sur la plage.<\/figcaption><\/figure>\n

    On comprend mieux maintenant pourquoi les baleines et les dauphins ne peuvent pas vivre hors de l'eau.<\/strong><\/h2>\n

    Bien que les baleines et les dauphins soient des mammif\u00e8res qui respirent de l'air, leur organisme est parfaitement adapt\u00e9 \u00e0 la vie marine. Une fois \u00e0 terre, ils subissent une s\u00e9rie de cons\u00e9quences mortelles \u2013 pression interne, hyperthermie, d\u00e9shydratation, d\u00e9faillance d'organes \u2013 qui entra\u00eenent leur mort en quelques heures. Comprendre ce ph\u00e9nom\u00e8ne est crucial<\/strong> non seulement pour la science, mais aussi pour am\u00e9liorer les efforts de sauvetage et de conservation en milieu marin.<\/p>\n

     <\/p>","protected":false},"excerpt":{"rendered":"

    On tombe souvent sur des photos et des vid\u00e9os d\u00e9chirantes de baleines ou de dauphins gigantesques \u00e9chou\u00e9s, impuissants, sur des plages de sable fin, tandis que des gens se pr\u00e9cipitent pour les aider, les arrosant d'eau ou essayant de les repousser vers le large. Et une question se pose \u00e0 chaque fois.<\/p>","protected":false},"author":4,"featured_media":10171,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[117,152],"tags":[166,164,162,163,165,114,161],"class_list":["post-10105","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-marine-flora-and-fauna","tag-beach","tag-blue-whale","tag-dolphins","tag-marine-mammals","tag-red-sea","tag-sea-trips","tag-whales"],"yoast_head":"\nWhy whales and dolphins can\u2019t survive ashore? | Hurghada today<\/title>\n<meta name=\"description\" content=\"Learn why whales and dolphins can\u2019t survive ashore and what really causes deadly beach strandings. 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