Search results for "arktinen alue"
showing 10 items of 28 documents
Cryptogams signify key transitions of bacteria and fungi in Arctic sand dune succession.
2020
•Primary succession models focus on aboveground vascular plants. However, the prevalence of mosses and lichens, i.e. cryptogams, suggests they play a role in soil successions. Here, we explore whether effects of cryptogams on belowground microbes can facilitate progressive shifts in sand dune succession. •We linked aboveground vegetation, belowground bacterial and fungal communities, and soil chemical properties in six successional stages in Arctic inland sand dunes: bare sand, grass, moss, lichen, ericoid heath and mountain birch forest. •Compared to the bare sand and grass stages, microbial biomass and the proportion of fungi increased in the moss stage, and later stage microbial groups a…
Soil legacy determines arbuscular mycorrhizal spore bank and plant performance in the low Arctic
2020
AbstractHuman impact is rapidly changing vegetation globally. The effect of plant cover that no longer exists in a site may still affect the development of future vegetation. We focused on a little studied factor—arbuscular mycorrhizal (AM) fungus spore bank—and its effect on three test plant species. In a low Arctic field site, plots were maintained for 6 years, devoid of any vegetation or with a Solidago virgaurea monoculture cover. We analysed the AM fungal morphospecies composition and identified 21 morphospecies in the field plots. The AM morphospecies community was dominated by members of Acaulosporaceae. Monoculturing under low Arctic field conditions changed the soil AM spore commun…
Accounting for species interactions is necessary for predicting how arctic arthropod communities respond to climate change
2021
Species interactions are known to structure ecological communities. Still, the influence of climate change on biodiversity has primarily been evaluated by correlating individual species distributions with local climatic descriptors, then extrapolating into future climate scenarios. We ask whether predictions on arctic arthropod response to climate change can be improved by accounting for species interactions. For this, we use a 14-year-long, weekly time series from Greenland, resolved to the species level by mitogenome mapping. During the study period, temperature increased by 2 degrees C and arthropod species richness halved. We show that with abiotic variables alone, we are essentially un…
Biogeochemical cycling and ecological thresholds in a High Arctic lake (Svalbard)
2019
Lakes are a dominant feature of the Arctic landscape and a focal point of regional and global biogeochemical cycling. We collected a sediment core from a High Arctic Lake in southwestern Svalbard for multiproxy paleolimnological analysis. The aim was to find linkages between the terrestrial and aquatic environments in the context of climate change to understand centennial-long Arctic biogeochemical cycling and environmental dynamics. Two significant thresholds in elemental cycling were found based on sediment physical and biogeochemical proxies that were associated with the end of the cold Little Ice Age and the recent warming. We found major shifts in diatom, chironomid and cladoceran comm…
Experimental evidence of the long‐term effects of reindeer on Arctic vegetation greenness and species richness at a larger landscape scale
2019
1. Large herbivores influence plant community structure and ecosystem processes in many ecosystems. In large parts of the Arctic, reindeer (or caribou) are the only large herbivores present. Recent studies show that reindeer have the potential to mitigate recent warming-induced shrub encroachment in the Arctic and the associated greening of high-latitude ecosystems. This will potentially have large scale consequences for ecosystem productivity and carbon cycling. 2. To date, information on variation in the interactions between reindeer and plants across Arctic landscapes has been scarce. We utilized a network of experimental sites across a latitudinal gradient in the Scandinavian mountains …
Prokaryotic assemblages within permafrost active layer at Edmonson Point (Northern Victoria Land, Antarctica)
2018
This study was aimed at gaining insights on the prokaryotic community (in terms of both taxonomic composition and activities) inhabiting the active layer at Edmonson Point, an ice-free area on the eastern slope at the foot of Mount Melbourne (Northern Victoria Land, Antarctica). Samples were collected during the thawing period, when microbial physiological activities are restored to utilize previously frozen organic substrates. Despite the very small cell sizes (600 daltons) substrates, as indicated also by the obtained rates of enzymatic hydrolytic activities over proteolytic, glycolitic and phosphoric compounds. Taxonomical composition showed that Proteobacteria, Actinobacteria and Firmic…
Powered by assemblage : language for multiplicity
2021
Abstract Assemblage is one way to examine complexities in today’s world. In Deleuzian thinking, assemblage refers to both the act of assembling diverse elements and the arrangements of these elements for a specific purpose. Importantly, it is the interaction between elements that allows the assemblage to become more than the sum of its parts. Applying this concept to long-term research on Cold Rush – the transformation of the Arctic commons into commodities – I argue that examining the boom, bust, and buzz around the commons can be fruitfully conceptualised and studied with assemblage. This approach brings with it an ontological shift from binaries into multiplicities and multiple temporali…
Reimagining cultural memory of the arctic in the graphic narratives of Oqaluttuaq
2021
The Greenlandic oral story-telling tradition, Oqaluttuaq, meaning “history,” “legend,” and “narrative,” is recognized as an important entry point into Arctic collective memory. The graphic artist Nuka K. Godtfredsen and his literary and scientific collaborators have used the term as the title of graphic narratives published from 2009 to 2018, and focused on four moments or ‘snippets’ from Greenland’s history (from the periods of Saqqaq, late Dorset, Norse settlement, and European colonization). Adopting a fragmentary and episodic approach to historical narrativization, the texts frame the modern European presence in Greenland as one of multiple migrations to and settlements in the Artic, ra…
Vulnerability of the North Water ecosystem to climate change
2021
High Arctic ecosystems and Indigenous livelihoods are tightly linked and exposed to climate change, yet assessing their sensitivity requires a long-term perspective. Here, we assess the vulnerability of the North Water polynya, a unique seaice ecosystem that sustains the world’s northernmost Inuit communities and several keystone Arctic species. We reconstruct mid-to-late Holocene changes in sea ice, marine primary production, and little auk colony dynamics through multi-proxy analysis of marine and lake sediment cores. Our results suggest a productive ecosystem by 4400–4200 cal yrs b2k coincident with the arrival of the first humans in Greenland. Climate forcing during the late Holocene, l…
Law of the Land: Shades of Nordic Noir in an Arctic Western
2020
Armoton maa (Law of the Land, Jussi Hiltunen, 2017) is a contemporary western set on a peripheral border region in western Lapland, Finland. Combining crime story and family drama, it is a complex case of genre hybridity. This chapter asks how Law of the Land adapts elements from Nordic noir and modifies the Lapland film, a mixture of films set in Lapland. The melancholy mood and the dark aesthetic links the film to Nordic noir, which has traveled to remote regions recently. However, Lapland can also be seen as a Finnish version of the Wild West. Law of the Land exemplifies both the mutation and vitality of Nordic noir as a style, demonstrating that it can be adapted by other genres, even b…