| Titre : | AMBIO 40(6) - SEP 2011 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Isla H. Myers-Smith, Auteur ;
David S. Hik, Auteur ;
Catherine Kennedy, Auteur ;
Dorothy Cooley, Auteur ;
Jill F. Johnstone, Auteur ;
Alice J. Kenney, Auteur ;
Charles J. Krebs, Auteur
Canopy-forming shrubs are reported to be increasing at sites around the circumpolar Arctic. Our results indicate expansion in canopy cover and height of willows on Herschel Island located at 70 degrees north on the western Arctic coast of the Yu[...]
Article
Christopher Andrews, Auteur ;
Jan Dick, Auteur ;
Christer Jonasson, Auteur ;
Terry Callaghan, Auteur
A 30-year series (1978-2007) of photographic records were analysed to determine changes in lake ice cover, local (low elevation) and montane (high elevation) snow cover and phenological stages of mountain birch (Betula pubescens ssp. czerepanovi[...]
Article
Vanessa L. Lougheed, Auteur ;
Malcolm G. Butler, Auteur ;
Daniel C. McEwen, Auteur ;
John E. Hobbie, Auteur
The arctic tundra ponds at the International Biological Program (IBP) site in Barrow, AK, were studied extensively in the 1970s; however, very little aquatic research has been conducted there for over three decades. Due to the rapid climate chan[...]
Article
Yuriy Narozhniy, Auteur ;
Valeriy Zemtsov, Auteur
Results of research into climate and glacier dynamics in the Altai Mountains (Russia) over the period of instrumental observations (1952-2008) are presented in this article. About 1030 glaciers with a total area of 805 km(2) and volume of 42.5 k[...]
Article
David R. Johnson, Auteur ;
Diane Ebert-May, Auteur ;
Patrick J. Webber, Auteur ;
Craig E. Tweedie, Auteur
Global change affects alpine ecosystems by, among many effects, by altering plant distributions and community composition. However, forecasting alpine vegetation change is challenged by a scarcity of studies observing change in fixed plots spann[...]
Article
Margareta Johansson, Auteur ;
Jonas Akerman, Auteur ;
Frida Keuper, Auteur ;
Torben R. Christensen, Auteur ;
Hugues Lantuit, Auteur ;
Terry V. Callaghan, Auteur
Monitoring of permafrost has been ongoing since 1978 in the Abisko area, northernmost Sweden, when measurements of active layer thickness started. In 1980, boreholes were drilled in three mires in the area to record permafrost temperatures. Reco[...]
Article
Sara Rundqvist, Auteur ;
Henrik Hedenas, Auteur ;
Anneli Sandstrom, Auteur ;
Urban Emanuelsson, Auteur ;
Hakan Eriksson, Auteur ;
Christer Jonasson, Auteur ;
Terry V. Callaghan, Auteur
Shrubs and trees are expected to expand in the sub-Arctic due to global warming. Our study was conducted in Abisko, sub-arctic Sweden. We recorded the change in coverage of shrub and tree species over a 32- to 34-year period, in three 50 x 50 m [...]
Article
Jesper Madsen, Auteur ;
Cornelia Jaspers, Auteur ;
Mikkel Tamstorf, Auteur ;
Christian Ebbe Mortensen, Auteur ;
Frank Riget, Auteur
Greening of the Arctic due to climate warming may provide herbivores with richer food supplies, resulting in higher herbivore densities. In turn, this may cause changes in vegetation composition and ecosystem function. In 1982-1984, we studied t[...]
Article
Henrik Hedenas, Auteur ;
Hakan Olsson, Auteur ;
Christer Jonasson, Auteur ;
Johan Bergstedt, Auteur ;
Ulrika Dahlberg, Auteur ;
Terry V. Callaghan, Auteur
This study was conducted in the Swedish sub-Arctic, near Abisko, in order to assess the direction and scale of possible vegetation changes in the alpine-birch forest ecotone. We have re-surveyed shrub, tree and vegetation data at 549 plots group[...]
Article
Cecilia Johansson, Auteur ;
Veijo A. Pohjola, Auteur ;
Christer Jonasson, Auteur ;
Terry V. Callaghan, Auteur
A unique long term, 49-year record (divided into three time periods 1961-1976, 1977-1992, and 1993-2009) of snow profile stratigraphy from the Swedish sub Arctic, was analyzed with a focus on changes in snow characteristics. The data set contain[...]
Article
Terry V. Callaghan, Auteur ;
Craig E. Tweedie, Auteur ;
Patrick J. Webber, Auteur
Polar and alpine environments are changing rapidly due to increases in temperature, which are amplified in the Arctic, as well as changes in many local factors. The impacts on ecosystems and their function have potential consequences for local r[...]
Article
Terry V. Callaghan, Auteur ;
Craig E. Tweedie, Auteur ;
Jonas Akerman, Auteur ;
Christopher Andrews, Auteur ;
Johan Bergstedt, Auteur ;
Malcolm G. Butler, Auteur ;
Torben R. Christensen, Auteur ;
Dorothy Cooley, Auteur ;
Ulrika Dahlberg, Auteur ;
Ryan K. Danby, Auteur ;
Fred J. A. Daniels, Auteur ;
Johannes G. de Molenaar, Auteur ;
Jan Dick, Auteur ;
Christian Ebbe Mortensen, Auteur ;
Diane Ebert-May, Auteur ;
Urban Emanuelsson, Auteur ;
Hakan Eriksson, Auteur ;
Henrik Hedenas, Auteur ;
Greg H. R. Henry, Auteur ;
David S. Hik, Auteur ;
John E. Hobbie, Auteur ;
Elin J. Jantze, Auteur ;
Cornelia Jaspers, Auteur ;
Cecilia Johansson, Auteur ;
Margareta Johansson, Auteur ;
David R. Johnson, Auteur ;
Jill F. Johnstone, Auteur ;
Christer Jonasson, Auteur ;
Catherine Kennedy, Auteur ;
Alice J. Kenney, Auteur ;
Frida Keuper, Auteur ;
Saewan Koh, Auteur ;
Charles J. Krebs, Auteur ;
Hugues Lantuit, Auteur ;
Mark J. Lara, Auteur ;
David Lin, Auteur ;
Vanessa L. Lougheed, Auteur ;
Jesper Madsen, Auteur ;
Nadya Matveyeva, Auteur ;
Daniel C. McEwen, Auteur ;
Isla H. Myers-Smith, Auteur ;
Yuriy K. Narozhniy, Auteur ;
Hakan Olsson, Auteur ;
Veijo A. Pohjola, Auteur ;
Larry W. Price, Auteur ;
Frank Riget, Auteur ;
Sara Rundqvist, Auteur ;
Anneli Sandstroem, Auteur ;
Mikkel Tamstorf, Auteur ;
Rik Van Bogaert, Auteur ;
Sandra Villarreal, Auteur ;
Patrick J. Webber, Auteur ;
Valeriy A. Zemtsov, Auteur
Understanding the responses of tundra systems to global change has global implications. Most tundra regions lack sustained environmental monitoring and one of the only ways to document multi-decadal change is to resample historic research sites.[...]
Article
Ryan K. Danby, Auteur ;
Saewan Koh, Auteur ;
David S. Hik, Auteur ;
Larry W. Price, Auteur
Repeat measurements from long-term plots provide precise data for studying plant community change. In 2010, we visited a remote location in Yukon, Canada, where a detailed survey of alpine tundra communities was conducted in 1968. Plant communit[...]
Article
Fred J. A. Daniels, Auteur ;
Johannes G. de Molenaar, Auteur
The changes in the vascular plant flora of Tasiilaq, low arctic Southeast Greenland, between around 1900 and 2007 were studied by comparing the data from historical literature with those of the field observations performed between the late 1960s[...]
Article
Terry V. Callaghan, Auteur ;
Torben R. Christensen, Auteur ;
Elin J. Jantze, Auteur
We report on a revisit in 2009 to sites where vegetation was recorded in 1967 and 1970 on Disko Island, West Greenland. Re-sampling of the same clones of the grass Phleum alpinum after 39 years showed complete stability in biometrics but dramati[...]
