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.
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 ...
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.
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)
Who'd a thunk?
:'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
Hold on now ... you mean a single cell can be an entire organism? Don't tell the subpreme court ...
|
· 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 LiveScience Mirabilis.ca Nat Geographic PhysOrg Science Daily Science News Texas AM Yahoo Excerpt, or Link only? |
|
||
|
· Science topic · science keyword · Books/Literature topic · pages keyword · |
|||
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.
