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4 janvier 2017 3 04 /01 /janvier /2017 08:57

Un orque épaulard, vraisemblablement né en 1911, n'a plus été observé depuis le 12 octobre dernier dans le détroit de Haro (entre les îles de Vancouver et San Juan, le long de la frontière Pacifique canado - étatsunienne - état de Washington au Sud, Colombie Britannique au Nord -). les scientifiques ont désormais perdu espoir de le revoir vivant. Mail online, hier. Ellie Zolfagharifard. RIP "Granny" : World's oldest killer whale, who swam the oceans before the Titanic sank, dies at the age of 105.

http://www.dailymail.co.uk/sciencetech/article-4084340/RIP-Granny-World-s-oldest-killer-whale-swam-oceans-Titanic-sank-dies-age-105.html

"Granny", encore récemment dans toute sa puissance vitale

http://thewildlife.wbur.org/2016/02/03/the-mystery-of-the-killer-whale-baby-boom/

Actualisation au 31 janvier 2017. Après le décès de leur matriarche, les orques piscivores affrontent désormais des difficultés immenses pour se nourrir des poissons chinook dont les effectifs comme les routes de migration connaissent de fortes fluctuations ces dernières années. Ce groupe d'orques est strictement salmonivore, une culture transmise de mère en fille depuis des millénaires. Confrontée aux changements soudains et brutaux d'un monde en transition, Granny, grâce à la plasticité de sa cartographie mentale dûe à l'extrême richesse de son expérience, continuait à assurer l'essentiel à son clan. Aujourd'hui, celui - ci subit la famine. National Geographic, 31 janvier 2017. Carl Safina. "Southern resident killer whale population is running out of salmon salmon, running out of time." 

http://voices.nationalgeographic.com/2017/01/31/southern-resident-killer-whale-population-is-running-out-of-salmon-running-out-of-time/

The Southern Resident killer whales are starving to death. Seven members of the critically endangered population died in 2016, including Granny, the oldest killer whale in the world and the leader of the Southern Residents. This unique community of whales only eats fish, a cultural tradition passed down for thousands of years from mother to young. At an estimated 105 years old, Granny was the keeper of knowledge; she knew where to find salmon in times of plenty, and where to look for them in leaner years. Recently, every year has been a lean year, and the Southern Resident whales have been spread far and wide in search of salmon, but Granny was always in the lead.

Southern Resident killer whales evolved side-by-side with salmon in the Pacific Ocean. They learned to select the best and fattiest of fish, the Chinook salmon, and discovered the best locations and times to find these Kings, committing that knowledge to memory and passing it along down generations. Even as Chinook salmon populations have plummeted in the Northwest, the Southern Resident killer whales stick to their traditions and follow their elders, and continue to visit the mouths of specific rivers when the salmon are running.

But now, they’re running out of fish, and running out of time. Critically endangered and faced with a multitude of threats, and now without their venerated leader, this population of killer whales lives on the brink of extinction. The Southern Residents need an abundant and widely available distribution of Chinook salmon throughout the year, in the entire extent of their range, not just in the fraction that federal agencies have designated as summer critical habitat.

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