Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Small Organisms, Great Proxies
University of Arkansas ^ | Monday, October 23, 2006 | Melissa Lutz Blouin

Posted on 01/11/2007 10:47:54 PM PST by SunkenCiv

The present and past compositions of communities of single-celled algae in several Canadian lakes and their relationship to the known climate record suggest that these organisms and the lakes they reside in are highly influenced by sun spot cycles, says a University of Arkansas researcher. In addition, the paleorecord of the fossilized organisms from one of the lakes reflects a climate-changing event at the end of the last Ice Age more than 8,000 years ago. Together, these findings indicate that fossil diatoms in lake sediments provide a strong proxy for paleoclimatic and paleoenvironmental change... The fossil record at lac du Sommet also recorded changes in the diatom community concentrations that indicate a response to local climate warming about 8,400 years ago, caused by the collapse of the ice dome in the Hudson Strait region and the rerouting of the melt-off stream from the Laurentian Ice Sheet. This event is related to a climate cooling observed in Europe around 200 years later, known as the 8.2 K event. The date of the ice dome collapse remains to be determined; Hausmann and colleagues St. Onge and Patrick Lajeunesse of Université Laval in Quebec, Canada, are working on a project involving sediment cores in the Hudson Bay, where Hausmann is studying the shift from freshwater to marine diatoms.

(Excerpt) Read more at dailyheadlines.uark.edu ...


TOPICS: History; Science; Travel
KEYWORDS: godsgravesglyphs

Single-celled algae called diatoms live in lakes and provide a proxy for paleoclimate data. University of Arkansas professor Sonja Hausmann has linked changes in fossil diatom communities to sun spot cycles.

Small Organisms, Great Proxies

1 posted on 01/11/2007 10:47:56 PM PST by SunkenCiv
[ Post Reply | Private Reply | View Replies]

To: 75thOVI; Alice in Wonderland; AndrewC; Avoiding_Sulla; BenLurkin; Berosus; Brujo; CGVet58; Chani; ..

· Catastrophism ping list · join · view topics · view or post blog · bookmark ·

2 posted on 01/11/2007 10:48:35 PM PST by SunkenCiv ("I've learned to live with not knowing." -- Richard Feynman https://secure.freerepublic.com/donate/)
[ Post Reply | Private Reply | To 1 | View Replies]

To: 7.62 x 51mm; 75thOVI; Adder; albertp; Androcles; AntiGuv; asgardshill; At the Window; bitt; blu; ...
To all -- please ping me to other topics which are appropriate for the GGG list. Thanks.
Please FREEPMAIL me if you want on or off the
"Gods, Graves, Glyphs" PING list or GGG weekly digest
-- Archaeology/Anthropology/Ancient Cultures/Artifacts/Antiquities, etc.
Gods, Graves, Glyphs (alpha order)

3 posted on 01/11/2007 10:49:30 PM PST by SunkenCiv ("I've learned to live with not knowing." -- Richard Feynman https://secure.freerepublic.com/donate/)
[ Post Reply | Private Reply | To 1 | View Replies]

To: SunkenCiv
reflects a climate-changing event at the end of the last Ice Age more than 8,000 years ago

Who'd a thunk?

4 posted on 01/12/2007 6:42:30 AM PST by AndrewC (Duckpond, LLD, JSD (all honorary))
[ Post Reply | Private Reply | To 1 | View Replies]

To: AndrewC

:'D


New Signposts On The Path Of Early Human Migration
New Scientist | 1-11-2007 | Jeff Hecht
Posted on 01/11/2007 7:14:12 PM EST by blam
http://www.freerepublic.com/focus/f-news/1766187/posts


5 posted on 01/12/2007 7:54:26 AM PST by SunkenCiv ("I've learned to live with not knowing." -- Richard Feynman https://secure.freerepublic.com/donate/)
[ Post Reply | Private Reply | To 4 | View Replies]

To: AndrewC

Hold on now ... you mean a single cell can be an entire organism? Don't tell the subpreme court ...


6 posted on 01/12/2007 7:59:38 AM PST by MHGinTN (If you can read this, you've had life support. Promote life support for others.)
[ Post Reply | Private Reply | To 4 | View Replies]


· GGG managers are SunkenCiv, StayAt HomeMother, and Ernest_at_the_Beach ·
· join list or digest · view topics · view or post blog · bookmark · post a topic · subscribe ·

 
 Antiquity Journal
 & archive
 Archaeologica
 Archaeology
 Archaeology Channel
 BAR
 Bronze Age Forum
 Discovery
 Dogpile
 Eurekalert
 Google
 LiveScience
 Mirabilis.ca
 Nat Geographic
 PhysOrg
 Science Daily
 Science News
 Texas AM
 Yahoo
 Excerpt, or Link only?
 


Just updating the GGG info, not sending a general distribution.

To all -- please ping me to other topics which are appropriate for the GGG list.
 

· History topic · history keyword · archaeology keyword · paleontology keyword ·
· Science topic · science keyword · Books/Literature topic · pages keyword ·


7 posted on 07/03/2011 2:40:30 PM PDT by SunkenCiv (It's the Obamacare, stupid! -- Thanks Cincinna for this link -- http://www.friendsofitamar.org)
[ Post Reply | Private Reply | View Replies]

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson