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From: "Alister John Marsh" <>
Subject: Re: [DNA] severely bottlenecked wolves and their y haps and Howdohistoric CO2 levels relate to haplogroups
Date: Fri, 4 Jun 2010 12:38:55 +1200
References: <mailman.2061.1275582382.11644.genealogy-dna@rootsweb.com><A6BDE8944FE64CF1972BE4228106225C@UserPC>
In-Reply-To: <A6BDE8944FE64CF1972BE4228106225C@UserPC>


Quinny,

If methane is 30 times more potent as a greenhouse gas than CO2, perhaps I
should look to see how bottlenecks correlate with methane lows, rather than
CO2 lows. Interesting article.

John.

-----Original Message-----
From:
[mailto:] On Behalf Of Brian Quinn
Sent: Friday, June 04, 2010 11:52 AM
To:
Subject: [DNA] severely bottlenecked wolves and their y haps and How
dohistoric CO2 levels relate to haplogroups

http://www.abc.net.au/science/articles/2010/05/24/2907370.htm

13,400 years ago in younger dryas methane and Co2 declined markedly as earth

cooled

megafauna died out in North America and above article notes that this might
be correlated with arrival of people in Americas


mind you sounds to me that the megafauna would have frozen to death and so
would the people

either way that cooling event was all over the world and would have devasted

pop of high latitudes

so I would look for pop bottle necks about 13,400 years ago amongst people
in high lats

and woolly mammoths would have had one too : )

has anyone checked yhaps of timber wolfs, polar bears etc

oh yes they have...sort of

http://rspb.royalsocietypublishing.org/content/270/1510/91.full.pdf
actually it is a case of a nearly extinct pack getting a new male
Rescue of a severely bottlenecked wolf

(Canis lupus) population by a single immigrant

Carles Vila`1, Anna-Karin Sundqvist1, Øystein Flagstad1,

Jennifer Seddon1, Susanne Bjo¨ rnerfeldt1, Ilpo Kojola2, Adriano Casulli3,

HaÊ kan Sand4, Petter Wabakken5 and Hans Ellegren



so severe bottlenecking leads to low breeding even if conditions get better
but when new mates arrive there is outbreeding and the population goes nuts



thus males arriving with new haplotypes along with new genetics all round
are favoured by the females

the old y hap that stays put tends to die out

maybe bottlenecking is more devastating to males than females especially if

they stay put



quinny





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