HOME >> BIOLOGY >> NEWS
Tundra disappearing at rapid rate

Forests of spruce trees and shrubs in parts of northern Canada are taking over what were once tundra landscapes--forcing out the species that lived there. This shift can happen at a much faster speed than scientists originally thought, according to a new University of Alberta study that adds to the growing body of evidence on the effects of climate change.

The boundary, or treeline, between forest and tundra ecosystems is a prominent landscape feature in both Arctic and mountain environments. As global temperatures continue to increase, the treeline is expected to advance but the new research shows that this shift will not always occur gradually but can surge ahead.

"The conventional thinking on treeline dynamics has been that advances are very slow because conditions are so harsh at these high latitudes and altitudes," said Dr. Ryan Danby, from the Department of Biological Sciences. "But what our data indicates is that there was an upslope surge of trees in response to warmer temperatures. Its like it waited until conditions were just right and then it decided to get up and run, not just walk."

Danby and Dr. David Hik, also from the Faculty of Science, reconstructed changes in the density and altitude of treeline forests in southwestern Yukon over the past 300 years. Using tree rings, they were able to date the year of establishment and death of spruce trees and reconstruct changes in treeline vegetation. The study is published in the "Journal of Ecology."

They found that a rapid change in response to climate warming during the early mid 20th century was observed at all locations. Treeline advanced considerablyas much as 85 metres elevationon warm, south-facing slopes and tree density increased significantlyas much as 65 per centon cooler, north-facing slopes.

"The mechanism of change appears to be associated with occasional years of extraordinarily high seed productiontriggered by hot, dry summersfollowed by
'"/>

Contact: Phoebe Dey
phoebe.dey@ualberta.ca
780-492-0437
University of Alberta
5-Mar-2007


Page: 1 2

Related biology news :

1. NSF funds Panikovs Alaskan Tundra Microbial Observatory project
2. Indo-Pacific coral reefs disappearing more rapidly than expected
3. 1,000-year-old Arctic ponds disappearing due to global warming
4. Over a century after disappearing, wild elk return to Ontario
5. Wild bees and the flowers they pollinate are disappearing together
6. Himalayan forests disappearing
7. Academy awards medal to noted expert in disappearing amphibians
8. Gene expression patterns predict rapid decline in idiopathic pulmonary fibrosis patients
9. New way to catch cancers spread, rapid 3-D retinal imaging, more at CLEO/QELS 2007
10. Dipstick test could reduce risk of food poisoning by rapidly detecting spoilage
11. DNA analysis reveals rapid population shift among Pleistocene cave bears

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/20/2018)... ... November 20, 2018 , ... Thanks to its long-standing expertise ... on the ID reader market, as the company now proposes a full range of ... etc. Elyctis ID reader range can be used by professionals either in a fixed ...
(Date:11/16/2018)... ... November 16, 2018 , ... ... called All Things Chemical™ and it will engage listeners in intelligent, insightful conversation ... business issues surrounding chemicals. B&C’s talented team of lawyers, scientists, and consultants will ...
(Date:11/15/2018)... ... November 15, 2018 , ... Superior Controls, ... IT solutions with 140 employees on both the east and west coasts, today ... (CSIA) Certification. CSIA Certified control system integrators must pass an intensive audit every ...
Breaking Biology News(10 mins):
(Date:11/13/2018)... ... November 13, 2018 , ... , Park Systems, world leader in ... the increasingly growing demand for AFM technology in China, Park Systems has decided to ... an office in Beijing equipped with Park AFM. , The Grand Opening of the ...
(Date:11/9/2018)... ... November 08, 2018 , ... Superior Controls, Inc. , ... with 140 employees on both the east and west coasts, today announced the ... Center on November 14 and 15 in Philadelphia. The event is hosted by ...
(Date:11/5/2018)... ... November 05, 2018 , ... USARAD Holdings Inc., the leading ... several healthcare VC firms announces at Distributed Health 2018 conference November 5-6 (Nashville, ... tokens and obtaining its first radiology interpretations, one of the first known true ...
(Date:10/31/2018)... ... October 30, 2018 , ... Rooam , the premier payment platform ... this winter. After its acquisition of the Tally payment app, the leading payment platform ... tips, Rooam will grow its market share and increase the number of restaurant and ...
Breaking Biology Technology:
Cached News: