English
norskBlar i forfatter "Mörsdorf, Martin Alfons"
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Decades of Recovery From Sheep Grazing Reveal No Effects on Plant Diversity Patterns Within Icelandic Tundra Landscapes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-26)Tundra plant communities are often shaped by topography. Contrasting wind exposure, slopes of different inclination and landforms of different curvature affect habitat conditions and shape plant diversity patterns. The majority of tundra is also grazed by ungulates, which may alter topographically induced plant diversity patterns, but such effects may depend on the spatial scales of assessments. ... -
Deepened snow enhances gross nitrogen cycling among Pan-Arctic tundra soils during both winter and summer
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-10)Many Arctic regions currently experience an increase in winter snowfall as a result of climate change. Deepened snow can enhance thermal insulation of the underlying soil during winter, resulting in warmer soil temperatures that promote soil microbial nitrogen (N)-cycle processes and the availability of N and other nutrients. We conducted an <i>ex situ</i> study comparing the effects of deepened ... -
Deepened winter snow significantly influences the availability and forms of nitrogen taken up by plants in High Arctic tundra
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-13)Climate change may alter nutrient cycling in Arctic soils and plants. Deeper snow during winter, as well as summer warming, could increase soil temperatures and thereby the availability of otherwise limiting nutrients such as nitrogen (N). We used fences to manipulate snow depths in Svalbard for 9 consecutive years, resulting in three snow regimes: 1) <i>Ambient</i> with a maximum snow depth of ... -
Definition of sampling units begets conclusions in ecology: The case of habitats for plant communities
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-03-05)In ecology, expert knowledge on habitat characteristics is often used to define sampling units such as study sites. Ecologists are especially prone to such approaches when prior sampling frames are not accessible. Here we ask to what extent can different approaches to the definition of sampling units influence the conclusions that are drawn from an ecological study? We do this by comparing a ... -
Disappearing green: Shrubs decline and bryophytes increase with nine years of increased snow accumulation in the High Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-25)<i>Question</i> - How does increased snow depth affect plant community composition of High Arctic tundra, and can the Normalized Differential Vegetation Index (NDVI) detect induced changes?<p><p> <i>Location</i> - Adventdalen, Spitsbergen, Svalbard (78°10′ N, 16°04′ E).<p><p> <i>Methods</i> - We manipulated snow depth on the tundra using fences, resulting in <i>Deep, Medium</i>, and ... -
Effects of local and regional drivers on plant diversity within tundra landscapes
(Doctoral thesis; Doktorgradsavhandling, 2015-12-21)In tundra, the diversity within vascular plant communities (alpha diversity) is known to be determined by local drivers such as habitat productivity and ungulate grazing. However, little is known how such local drivers modify the diversity between communities (beta diversity). Furthermore, diversity patterns may be constrained by the size of the regional species pool, which in turn may mediate the ... -
Habitat determines plant community responses to climate change in the High Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-12)Plant climate responses may depend on site-specific environmental context. Using fences and open-top chambers, we enhanced snow depth (creating Ambient, Medium, and Deep regimes) over an 11-year period and increased temperatures for two summers in dry heath and mesic meadow habitats on Svalbard, Norway. Comparison of plant growth form abundance and diversity responses in these two habitats showed ... -
Increased snow and cold season temperatures alter High Arctic parasitic fungi – host plant interactions
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-07)In the Arctic, fungal mycelial growth takes place mainly during the cold season and beginning of growing season. Climate change induced increases of cold season temperatures may, hence, benefit fungal growth and increase their abundance. This is of particular importance for parasitic fungi, which may significantly shape Arctic vegetation composition. Here, we studied two contrasting plant parasitic ... -
Tundra Trait Team: A database of plant traits spanning the tundra biome
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-22)<p><i>Motivation</i>: The Tundra Trait Team (TTT) database includes field‐based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade‐offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite ...
