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Author Topic:   Authors and PhD's
Mammuthus
Member (Idle past 6730 days)
Posts: 3085
From: Munich, Germany
Joined: 08-09-2002


Message 16 of 20 (188344)
02-25-2005 3:00 AM
Reply to: Message 3 by Pradu
02-24-2005 3:30 PM


PhD in human genetics 1996. Publication of books (a book chapter if that counts). Multiple research articles published. No novels...current research genetic consequences of end Pleistocene extinctions on megafauna, co factors in prion pathogenesis, and the evolution of endogenous retroviruses. I dabble in disease mediated extinctions....I can also whistle pretty well and can rub my stomach and pat myself on the head at the same time without getting confused.

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 Message 17 by custard, posted 02-25-2005 3:11 AM Mammuthus has replied

  
custard
Inactive Member


Message 17 of 20 (188348)
02-25-2005 3:11 AM
Reply to: Message 16 by Mammuthus
02-25-2005 3:00 AM


mammuthus writes:
current research genetic consequences of end Pleistocene extinctions on megafauna...
Since this is your current field of research, I have a slightly related question: Any idea how accurate the use of ice core and tree ring samples are for determing the ambient temperature?
I've seen temperature 'reconstructions,' using such proxies, but I imagine the margin of error is extremely high.

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 Message 16 by Mammuthus, posted 02-25-2005 3:00 AM Mammuthus has replied

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 Message 18 by Mammuthus, posted 02-25-2005 3:56 AM custard has replied

  
Mammuthus
Member (Idle past 6730 days)
Posts: 3085
From: Munich, Germany
Joined: 08-09-2002


Message 18 of 20 (188358)
02-25-2005 3:56 AM
Reply to: Message 17 by custard
02-25-2005 3:11 AM


quote:
current research genetic consequences
...sorry custard. As you can see by the word I put in bold, as one trained in genetics and molecular biology, I cannot address your question. The types of studies I do are collaborative in nature such that my colleagues in mammalogy and geology fill in the areas where I lack expertise and I do all the mol biol work. In the end we see where there is overlap and if we were able to show a correlation between observations in the different fields. For example, via radiochronological study of various megafaunal species in parts of Russia, there is good evidence for the extirpation of multiple species like mammoths..but also of species that survived. I can sample the dated bones and see if there is reduction in genetic variation by comparing their DNA with the genetic variation in modern samples. For example, one group doing similar research showed a fairly catastrophic loss of genetic variation in bison that coalesces around the time of the end-Pleistocene extinctions...the second loss of variation can be found at the time of that the colonists in the US almost wiped out the buffalo.....so to sum it up..no I can't help with your temperature reconstruction question

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 Message 19 by custard, posted 02-25-2005 4:28 AM Mammuthus has replied

  
custard
Inactive Member


Message 19 of 20 (188363)
02-25-2005 4:28 AM
Reply to: Message 18 by Mammuthus
02-25-2005 3:56 AM


so to sum it up..no I can't help with your temperature reconstruction question
thanks anyway
That's some pretty interesting stuff you are working on. I've always been facinated by Megafuana. Any sites you can recommend that discuss theories regarding their extinction? Or is it all chalked up to predation?

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 Message 18 by Mammuthus, posted 02-25-2005 3:56 AM Mammuthus has replied

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 Message 20 by Mammuthus, posted 02-25-2005 4:35 AM custard has not replied

  
Mammuthus
Member (Idle past 6730 days)
Posts: 3085
From: Munich, Germany
Joined: 08-09-2002


Message 20 of 20 (188365)
02-25-2005 4:35 AM
Reply to: Message 19 by custard
02-25-2005 4:28 AM


Hi custard
It's mostly a pain in the butt these days rather than being interesting
Here are some sites...predation and climate change and disease are all possibilities...nobody agrees on the root cause.
http://www.amnh.org/...sity/extinction/IntroSymposiumFS.html
http://www.amnh.org/exhibitions/expeditions/siberia/

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 Message 19 by custard, posted 02-25-2005 4:28 AM custard has not replied

  
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