Now showing items 31-40 of 61
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 ...
What is natural? The importance of a long-term perspective in biodiversity conservation and management
(American Association for the Advancement of Science, 2006)
Ecosystems change in response to factors such as climate variability, invasions, and wildfires. Most records used to assess such change are based on short-term ecological data or satellite imagery spanning only a few ...
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 ...
Relationships between calibrated ages and depth in stratigraphical sequences: an estimation procedure by mixed-effect regression
We present a procedure for estimating age-depth relationships in stratigraphical sequences by means of a generalized mixed-effect regression using an ancillary function for the partitioning of the fixed effect and the ...
Distinguishing the roles of dispersal in diversity maintenance and in diversity limitation
(Opulus Press, 2005-07)
In recent years, a considerable research effort has gone into studying how dispersal might affect the diversity of local communities. While this general topic has received attention from theoretical and empirical ecologists ...
Period lenght in cyclic animal populations
(Ecological Society of America, 2005)
Although cyclic animal dynamics have long been a focus of scientific interest, the variable cycle lengths are poorly understood. Based on a review of the literature, we suggest that period length in animals showing ...
Treeline and vegetation dynamics in response to environmental changes in Nepal, the central Himalaya
(The University of Bergen, 2013-05-31)
Aims: To describe and evaluate patterns of vegetation response to ongoing environmental changes across climate-limited (alpine treeline ecotone) and humanmodified (temperate Himalayan oak forests) ecosystems in Nepal, ...
What is the observed relationship between species richness and productivity? Comment
(Ecological Society of America, 2003)
Breeding system, insect flower visitation, and floral traits of two alpine cerastium species in Norway
(The Institute of Arctic and Alpine Research, 1999)
The pollination and reproductive ecology of Saxifraga stellaris was investigated in alpine southwest Norway. A breeding system analysis, with performance of controlled crosses, revealed that S. stellaris is self-compatible ...
Recent environmental change and atmospheric contamination on Svalbard as recorded in lake sediments – an introduction
This paper outlines an interdisciplinary project on recent environmental change and atmospheric contamination on the high Arctic archipelago of Svalbard (76º30'N – 80º30'N). It describes the rationale and aims of the project ...