Une colonie de manchots Adélie a été décimée au cours des dernières décennies à cause de la dérive d’un iceberg. Environ 150.000 d’entre eux sont morts.
Environ 150.000 membres d’une colonie de manchots Adélie ont péri en Antarctique au cours des dernières années à cause de la dérive d’un iceberg qui les a privés d’accès à la mer, selon une étude publiée par la revue scientifique Antartic Science et relayée par le quotidien britannique The Guardian.
Les manchots ont dû s’acquitter de 60 km jusqu’à l’océan pour se nourrir
La colonie de sphéniscidés vivant dans la zone du Cap Denison a été privée de son accès habituel à la mer quand un iceberg à la dérive, « grand comme la ville de Rome », s’est rattaché au continent en 2010. Encerclés par la terre, les manchots ont alors dû s’acquitter de 60 km jusqu’à l’océan pour se nourrir. Ce voyage a eu un effet dévastateur sur la taille de la colonie qui ne devrait plus exister d’ici 20 ans, selon les scientifiques.
« Le sol était jonché de carcasses »
L’arrivée de cette masse glaciaire et la formation d’une banquise côtière qui en a découlé a obligé les manchots à allonger de 60 km leur périple pour se rendre sur le lieu où se trouve leur nourriture, ce qui a entravé leur processus de reproduction.
Lors du recensement qu’ils ont réalisé en décembre 2013, les chercheurs ont observé sur la colonie des centaines d’œufs abandonnés. « Le sol était jonché des carcasses desséchées par le froid des poussins de la saison précédente », a déclaré Chris Turney, chercheur l’UNSW et chef de l’expédition de 2013. « Ceux qui survivent sont clairement en train de lutter. Pas sûr qu’ils survivent eux-mêmes donc difficile d’imaginer qu’ils soient capable de faire éclore la prochaine génération. Voir ça vous brise le cœur .
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