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Microbial colonizers of Arctic soils are sensitive to future climate change


Microbial colonizers of Arctic soils are sensitive to future climate change

This region of the Arctic has undergone substantial warming in recent decades. Credit: James Bradley A team of researchers from the University of Bristol have recently shown that ecosystems created by melting glaciers in the Arctic are sensitive to climate change and human activity. Melting ice is exposing vast landscapes that are colonised by simple forms of microbial life.
These microbes in Arctic soils must cope with short cool summers and long freezing winters, as well as starvation from nutrients.
However, warming temperatures, shorter winters, and increased impacts from human activity threatens the balance of this unique and delicate ecosystem.
The researchers used new computational modelling software designed at the University of Bristol to show that future climate change in the Arctic over the next two centuries may enhance microbial growth and respiration rates, increasing CO2 emissions from soils.
Enhanced microbial activity also may increase nutrient availability and encourage plants to grow in these extreme environments.
Lead author James Bradley, from the School of Geographical Sciences and Cabot Institute at the University of Bristol (and now based at the University of Southern California), said: ”It is challenging to predict the effects of future climate change with field and laboratory experiments alone. Klemens Weisleitner from the University of Innsbruck, Austria, takes samples of snow from the forefield of the Midtre Lovénbreen glacier during the spring season in Svalbard Credit: James Bradley ”It takes decades to feasibly monitor long term ecological change. Recently designed modelling software allows us to manipulate and simulate experimental conditions over century timescales to enable long-term predictions of the effects of climate change on ecosystems.
In the space of two years, researchers found the field-site in Svalbard had changed dramatically.
Glaciers have melted away, retreating by tens of metres, and exposing soils to the atmosphere for the first time in thousands of years. The rate of melting is expected to increase in the coming years as Arctic temperatures increase further. Springtime snow cover in the Svalbard archipelago is under threat from warming temperatures associated with anthropogenic climate change. Credit: James Bradley James Bradley added: ”These findings show that we need to pay greater attention to the ecological consequences of climate change in Arctic soils.
The findings were published recently in the journal Frontiers in Earth Science, and the project was funded by NERC.
Explore further:Simple forms of life are quick to colonise new ’desert’ landscapes created by shrinking Arctic ice
More information: ’Microbial and biogeochemical dynamics in glacier forefields are sensitive to century-scale climate and anthropogenic change’ by J. Bradley, A. Anesio and S. Arndt in Frontiers in Earth Science, 2017.

Provided by:University of Bristol

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