Polar Bears, Polar Bears Everywhere

petros

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They have not!
Ursus maritimus tyrannus, It's current look is only 10,000 y.o. meaning it was the end of the Pleistocene and global warming that gave them todays' look.

Hecht (in Chaline, 1983) describes polar bear evolution: the first "polar bear", Ursus maritimus tyrannus, was essentially a brown bear subspecies, with brown bear dimensions and brown bear teeth. Over the next 20,000 years, body size reduced and the skull elongated. As late as 10,000 years ago, polar bears still had a high frequency of brown-bear-type molars. Only recently have they developed polar-bear-type teeth. http://www.geol.umd.edu/~candela/pbevol.html

Ain't clarity grand?
 

Cabbagesandking

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Ursus maritimus tyrannus, It's current look is only 10,000 y.o. meaning it was the end of the Pleistocene and global warming that gave them todays' look.



Ain't clarity grand?

Clarity might be grand. Next you will tell us what you are trying to clarify and what it has to do with sick and dying Polar Bears: with the steep decline in Polar Bear populations.
 

Walter

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Funny. Everything I come across says that this may have happened in the past but there is no proof. On the other hand it seems that in the last ten years as polar bears are pushed south by loss of ice it is happening now.
The world began when you were born.
 

taxslave

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lmaoGrizzlies descended from a brown bear that crossed the Bering Strait from eastern Russia a hundred thousand years ago or so. Eastern Rusiia is not prairie land. Russia's prairie land is in the central region.
They are and always have been typically a high country bear. I have no idea where you got the idea that they were a prairie bear but it's frackin funny.

Grizzlies live right on the ocean from about Toba inlet north. Could be even farther south but that is as far down the coast I have ever seen one on the shoreline.
 

petros

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Polar bears cannot adapt to this change any more than you could adapt to a diet of poison ivy. Those adaptations take hundreds, probably thousands. of years.
They've done it before. Several times in the past 70,000 years. But that is fact and you and facts are like oil and water..
They have not!
Ursus maritimus tyrannus, It's current look is only 10,000 y.o. meaning it was the end of the Pleistocene and global warming that gave them todays' look. Ain't clarity grand?

Hecht (in Chaline, 1983) describes polar bear evolution: the first "polar bear", Ursus maritimus tyrannus, was essentially a brown bear subspecies, with brown bear dimensions and brown bear teeth. Over the next 20,000 years, body size reduced and the skull elongated. As late as 10,000 years ago, polar bears still had a high frequency of brown-bear-type molars. Only recently have they developed polar-bear-type teeth. http://www.geol.umd.edu/~candela/pbevol.html

Why are the geologists at U of Maryland lieing?
 

L Gilbert

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In North America they were perfectly happy on the prarie untill forced into the mountains by people.
There were once a small portion of grizzlies that inhabited a part of the western US prairies, but the vast majority of them have and do inhabit forested, mountainous, and higher altitude terrain.
You are taking an exception and speaking of it as if it were the rule.
I wasn't talking about Russia but the fact that they migrated here shows how good they are at adapting.
Whooooooooooooosh! That's the sound of the point flying well above your head. Sure they are adaptable, to a degree. The point was that grizzlies started out as high-altitude, rough terrain animals. And then they migrated, and a few adapted to prairie life. The were not originally prairie animals, as you said. lol

The ice in Hudsons bay has not melted any faster in the last 7 years,the arctics pretty simple,hudsons freezes late september if the tundra is red and if it isn't red then early september.


From here: http://www.socc.ca/cms/en/seaIce/pastSeaIce.aspx

I know you don't like graphs, charts, and stuff because you haven't a clue how to read them (and they usually prove you wrong), but give it a try.


The red tundra thing is something I learned from very seasoned arctic exploration people with many decades up there.
It has a lot to do with the winter darkness and lack of sunshine.
So explain further this "red tundra" thing.

Grizzlies live right on the ocean from about Toba inlet north. Could be even farther south but that is as far down the coast I have ever seen one on the shoreline.
Look at the terrain from Toba Inlet north. Those shores are on the edges of mountainous and/or heavily forested regions with very few people inhabiting them.
You are doing the same as Krapatoe and taking an exception and treating it as if it were the rule. Most grizzlies inhabit mountainous, forested areas. They always have.

Anyway, I can't see the population of polar bears dwindling. But I can see them evolving into being smaller bears because they have to adapt to a different lifestyle.
 

petros

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petros

The Central Scrutinizer
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EXECUTIVE SUMMARY​

[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]The decline of grizzly bear populations during the 19[/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]th [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]century was mainly attributed to European exploration and settlement, and the associated introduction of firearms. The population decline on the Prairies was especially severe, aggravated by the eradication of wild bison and the advent of agriculture. Grizzly bears were rarely seen on the Canadian Prairies after 1900. [/FONT][/FONT]
[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]
In 1991, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) designated the Prairie population (delineated by the Prairie Ecozone) as Extirpated (Banci 1991). COSEWIC confirmed the extirpated status of the Prairie population in 2002 (COSEWIC 2002), and it was officially listed under the
[/FONT]
[/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]Species at Risk Act [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]in June 2003. [/FONT][/FONT]
[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]
[/FONT]
[/FONT]
 

L Gilbert

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L Gilbert

Winterized
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I can if you like. I can also tell you why they're red, and I was only there for a few months.
Sure. I'm curious.

EXECUTIVE SUMMARY

The decline of grizzly bear populations during the 19th century was mainly attributed to European exploration and settlement, and the associated introduction of firearms. The population decline on the Prairies was especially severe, aggravated by the eradication of wild bison and the advent of agriculture. Grizzly bears were rarely seen on the Canadian Prairies after 1900.

In 1991, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) designated the Prairie population (delineated by the Prairie Ecozone) as Extirpated (Banci 1991). COSEWIC confirmed the extirpated status of the Prairie population in 2002 (COSEWIC 2002), and it was officially listed under the
Species at Risk Act in June 2003.


Yeah, so?
 

petros

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Yep. Me, too. The point is that they did not originate as a prairie bear and the majority still aren't a prairie bear.
They were an everywhere bear.There are still plenty of blacks and browns on the prairie and they looooooooove oats.
One of the benefits of being an adaptable omnivore.
 

L Gilbert

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They were an everywhere bear.There are still plenty of blacks and browns on the prairie and they looooooooove oats.
Attaboy. Keep ignoring the facts.
One of the benefits of being an adaptable omnivore.
... is getting food where you can find it. Eventually polars will adapt to eating more vegetation and possibly less meat. Yeah.

Arctic Willow turns bright red in the late summer. To better help it gather as much of the suns waining warmth as it can.

It literally covers acres and acres.
Ah. Thanks. Never did venture that far north in the fall
 

petros

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Yep. Me, too. The point is that they did not originate as a prairie bear and the majority still aren't a prairie bear.
Why do they wander and graze the alpine meadows in preference to hunting for meat at lower ranges? Because they came from Siberia? Sure it wasn't the Gobi?




The Gobi Bear. Isn't standing one of the things that define the Griz?


More grazers....

 

L Gilbert

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Why do they wander and graze the alpine meadows in preference to hunting for meat at lower ranges?
Go ask one.
Because they came from Siberia?
I doubt it.
Sure it wasn't the Gobi?
Yep.



The Gobi Bear. Isn't standing one of the things that define the Griz?
Black bears stand, grizzlies stand, Tibetan bears stand, Kermode bears stand, polar bears stand, Kodiaks stand, etc. Just full of red herrings and strawman arguments aren'tcha?


More grazers....

Funny. I don't see them eating anything. Thjey look like they are changing location to me.