Now showing items 21-30 of 61
Tracing recovery from acidification in the Western Norwegian nausta watershed
(Royal Swedish Academy of Sciences, 2003)
A novel method, redundancy analysis (RDA), has been used to examine whether chemical recovery from acidification in the western Norwegian Nausta watershed produces detectable recovery within the community structure of ...
Multi-proxy studies in palaeolimnology
Multi-proxy studies are becoming increasingly common in palaeolimnology. Eight basic requirements and challenges for a multi-proxy study are outlined in this essay – definition of research questions, leadership, site ...
Holocene climatic change reconstructed from diatoms, chironomids, pollen and near-infrared spectroscopy at an alpine lake (Sjuodjijaure) in northern Sweden
The results of a multiproxy study reconstructing the climate history of the last 9300 years in northern Sweden are presented. It is based on diatom, chironomid and pollen analyses, as well as near-infrared spec troscopy ...
Lake-sediment records of recent environmental change on Svalbard: results of diatom analysis
Surface sediments from 23 lakes on Svalbard were analysed for diatoms. 182 taxa were found but samples generally have a low richness, with the majority of sites dominated by benthic genera such as Fragilaria, Navicula, and ...
Highest treeline in the Northern Hemisphere found in Southern Tibet
(International Mountain Society, 2007)
Three new records of the highest treelines in the northern hemisphere are presented here, based on the definition of a “tree.” The tree species with the highest treeline in the northern hemisphere is Juniperus tibetica ...
Effects of simulated environmental changes on growth and growth form in a late snowbed population of pohlia wahlenbergii (Web. et Mohr) Andr
(The Institute of Arctic and Alpine Research, 2003)
In a factorial field experiment we increased the temperature (OpenTop Chambers) and nutrients (nitrogen, phosphorus, and potassium[NPK]) to simulate predicted future climate changes and studiedthe growth response of the ...
Willow canopies and plant community structure along an alpine environmental gradient
(The Institute of Arctic and Alpine Research, 2005)
We examined the impact of Salix lapponum canopies on plantcommunity structure in five sites along a climatic gradient in aglacier foreland in alpine south Norway. Species richness is lowerinside canopies compared to outside ...
Recent ecosystem dynamics in nine North African lakes in the CASSARINA Project
An integrated multi-disciplinary study of nine North African lakes (CASSARINA) aims to establish ecological baselines and to explore responses to 20th century human impacts on their ecosystems. Water chemistry measurements ...
Does snail grazing affect growth of the old forest lichen Lobaria pulmonaria?
(Cambridge University Press, 2006)
Grazing marks from snails are frequently observed in populations of the old forest epiphyte Lobaria pulmonaria. However, grazing marks are more numerous in thalli from deciduous broadleaved forests than in thalli from ...
The rise and fall of forests
(American Association for the Advancement of Science, 2004)