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Commentaires sur : Le mystère des brebis écossaises résolu, le responsable : le changement climatique https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/ Pour une utilisation plus rationnelle de l'énergie Sat, 12 Sep 2009 07:18:56 +0000 hourly 1 https://wordpress.org/?v=5.8.13 Par : Le climat et l’évolution… | Energethique https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-489 Sat, 12 Sep 2009 07:18:56 +0000 https://energethique.be/?p=270#comment-489 […] plutôt le changement climatique et l’évolution. On avait déjà abordé le sujet avec cette évolution anormale du poids moyen de la population de brebis écossaises, voici que je tombe sur un article qui parle à nouveau de l’évolution des espèces et de […]

]]> Par : bonfire https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-234 Mon, 27 Jul 2009 18:55:58 +0000 https://energethique.be/?p=270#comment-234 Evolution et climat liés ?
Sans aucun doute mais dans ce cas une étude sur 25 ans ne peut tirer aucune conclusion.

]]> Par : Gizmo https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-230 Mon, 27 Jul 2009 12:44:54 +0000 https://energethique.be/?p=270#comment-230 Petite précision, Nabil est un des administrateurs de ce blog 😉

]]> Par : Gizmo https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-229 Mon, 27 Jul 2009 12:39:54 +0000 https://energethique.be/?p=270#comment-229 En fait, je crois que l’article d’éco salon veut plutôt mettre en avant le fait que l’évolution et le climat sont étroitement liés et que dans ce cas-ci, le changement climatique fait en sorte que la sélection s’en trouve modifiée…

Si tu veux en savoir plus, faut remonter les sources, pour trouver le rapport scientifique dont voici l’abstract:

Environmental change, including climate change, can cause rapid phenotypic change via both ecological and evolutionary processes. Because ecological and evolutionary dynamics are intimately linked, a major challenge is to identify their relative roles. We exactly decomposed the change in mean body weight in a free-living population of Soay sheep into all the processes that contribute to change. Ecological processes contribute most, with selection—the underpinning of adaptive evolution—explaining little of the observed phenotypic trend. Our results enable us to explain why selection has so little effect even though weight is heritable, and why environmental change has caused a decline in the body size of Soay sheep.

En lisant ça, je tire la même conclusion qu’Eco Salon, maintenant l’étude est peut-être fausse…

Merci pour ton avis !

]]> Par : Vinch https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-228 Mon, 27 Jul 2009 12:34:02 +0000 https://energethique.be/?p=270#comment-228 Mais de rien Bibil 😉

Je savais pas que tu étais modo de ce bon petit blog!

]]> Par : nabilsh https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-226 Mon, 27 Jul 2009 12:31:16 +0000 https://energethique.be/?p=270#comment-226 Merci vincent pour la précision, l’article a été modifié et corrigé !

]]> Par : Vinch https://energethique.be/2009/le-mystere-des-brebis-ecossaises-resolu-le-responsable-le-changement-climatique/comment-page-1/#comment-225 Mon, 27 Jul 2009 12:20:46 +0000 https://energethique.be/?p=270#comment-225 Le changement climatique ne prend pas le dessus sur l’évolution, ça n’a rien à voir, il y a erreur dans l’utilisation des concepts.

Selon la théorie de l’évolution, ce sont les individus les mieux adaptés, et pas spécialement les plus forts qui se développent et se reproduisent.

Si l’hiver est plus court et moins rigoureux, il est normal que les brebis fassent moins de réserve. Les stocks inutiles sont diminués, c’est logique, et pour les brebis elles mêmes, c’est une bonne adaptation.

Là où se trouve le problème, c’est que cela n’arrange pas le producteur. Le réchauffement climatique va à l’encontre de la sélection artificielle agricole, mais en aucun cas à l’encontre d’une meilleur adaptation de l’espèce à son environnement.

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