Oaks originated near the Arctic Circle

Discussions of current science research and issues that is being done by others as it relates to our interests.

Moderators: edfrank, dbhguru

#1)  Oaks originated near the Arctic Circle

Postby samson'sseed » Sat Sep 30, 2017 9:21 am

http://www.sciencemag.org/news/2017/09/ ... id=1573047

Oaks originally evolved about 45 million years ago near the Arctic Circle.  The Arctic Circle had a temperate climate then, and dormancy during winter was a competitive adaptation.  Farther south, North American and Eurasia were tropical.

As continental climate cooled and became temperate at lower latitudes, tropical species of plants died out and were replaced with the temperate climate adapted oaks.

For this message the author samson'sseed has received Likes :
Larry Tucei
User avatar
samson'sseed
 
Posts: 67
Joined: Sat Oct 29, 2011 10:02 am
Location: Augusta, Georgia
Has Liked: 22 times
Has Been Liked: 29 times
Print view this post

#2)  Re: Oaks originated near the Arctic Circle

Postby Larry Tucei » Tue Oct 03, 2017 12:08 pm

Fascinating since it was always thought they originated in the Tropics!  Thanks for sharing!  Larry
User avatar
Larry Tucei
 
Posts: 1827
Joined: Tue Mar 09, 2010 11:44 am
Location: Southern Mississippi
Has Liked: 693 times
Has Been Liked: 587 times
Print view this post

#3)  Re: Oaks originated near the Arctic Circle

Postby Bart Bouricius » Wed Oct 04, 2017 9:23 am

Larry,

In Maarten Kappelle's 2008 book Biodiversity of the Oak Forests of Tropical America, he notes that:  "Oak (Quercus) itself originated in the Northern Hemisphere and is therefore a genus that migrated during Pleistocene times, from the cool Northern temperate zone to the tropics in the South, taking advantage of the recently evolved cool mountain chains as their principal migration routes".    

Mexico has by far the largest number of oak species with 165 native species, compared with only 91 in the US and Canada.  However, as you move South in Central America the number of oak species dwindles, until there is only one in Colombia Quercus humboldtii.  It is the only oak species to have crossed the Panama Isthmus.  Costa Rica has 14 species, and Panama 12.  Only a couple of the Central American oak species have adapted to the hotter lowland environments.  The large impressive oaks in Central America are generally found from 7,000 (2,135 m) to 10,000 (3,050 m) feet in altitude.

For this message the author Bart Bouricius has received Likes - 2:
Larry Tucei, samson'sseed
User avatar
Bart Bouricius
 
Posts: 531
Joined: Sat Apr 17, 2010 10:41 am
Location: Amherst, MA USA
Has Liked: 109 times
Has Been Liked: 298 times
Print view this post

#4)  Re: Oaks originated near the Arctic Circle

Postby KoutaR » Thu Oct 05, 2017 3:13 am

By contrast, oaks (subgen. Cyclobalanopsis) and their relatives (Lithocarpus, Castanopsis) are relatively abundant in equatorial lowland forest of SE Asia (~equivalent to Amazonia), and still more so in SE Asian montane forests.

For this message the author KoutaR has received Likes :
samson'sseed
User avatar
KoutaR
 
Posts: 625
Joined: Tue Mar 16, 2010 4:41 am
Location: Germany
Has Liked: 76 times
Has Been Liked: 232 times
Print view this post

#5)  Re: Oaks originated near the Arctic Circle

Postby Bart Bouricius » Fri Oct 06, 2017 6:57 am

Kouta,

Interesting.  I do remember finding some beautiful, somewhat flattened acorn like seeds on a project in Borneo in the 90's.  Perhaps the trees they came from were in one of these genera.
User avatar
Bart Bouricius
 
Posts: 531
Joined: Sat Apr 17, 2010 10:41 am
Location: Amherst, MA USA
Has Liked: 109 times
Has Been Liked: 298 times
Print view this post


Return to General Science Discussions

Who is online

Users browsing this forum: No registered users and 2 guests

cron