by Staff Writers
Odense M, Denmark (SPX) Mar 31, 2017
When spring arrives in the Arctic, both snow and sea ice melt, forming melt ponds on the surface of the sea ice. Every year, as global warming increases, there are more and larger melt ponds. Melt ponds provide more light and heat for the ice and the underlying water, but now it turns out that they may also have a more direct and potentially important influence on life in the Arctic waters.
Mats of algae and bacteria can evolve in the melt ponds, which can provide food for marine creatures. This is the conclusion of researchers in the periodical, Polar Biology.
Own little ecosystems
+ Given that larger and larger areas of melt ponds are being formed in the Arctic, we can expect the release of more and more food for creatures in the polar sea.
Heidi Louise Sorensen studied the phenomenon in a number of melt ponds in North-Eastern Greenland as part of her PhD thesis at University of Southern Denmark (SDU).
Bo Thamdrup and Ronnie Glud of SDU, and Erik Jeppesen and Soren Rysgaard of Aarhus University also contributed to the work.
Food for seals and sea cucumbers
In the upper part of the water column it is mainly krill and copepods that benefit from the nutrient-rich algae and bacteria from melt ponds. These creatures are eaten by various larger animals, ranging from amphipods to fish, seals and whales. Deeper down, it is seabed dwellers such as sea cucumbers and brittle stars that benefit from the algae that sink down.
For some time now, researchers have been aware that simple biological organisms can evolve in melt ponds - they may even support very diverse communities. But so far it has been unclear why sometimes there are many organisms in the ponds, and on other occasions virtually none.
According to the new study, 'nutrients' is the keyword. When nutrients such as phosphorus and nitrogen find their way into a melt pond, entire communities of algae and micro-organisms can flourish.
From the Siberian tundra
Finally, migratory birds or other larger animals resting on the ice can leave behind sources of nutrient.
+ Climate change is accompanies by more storms and more precipitation, and we must expect that more nutrients will be released from the surroundings into the melt ponds. These conditions, plus the fact that the distribution of areas of melt ponds is increasing, can contribute to increased productivity in plant and animal life in the Arctic seas, says Professor Ronnie Glud of the Department of Biology at SDU.
Warmer and more windy
+ When the sea ice disappears, light can penetrate down into the water.
+ water. When it gets warmer on the mainland, this creates more melt water, which can flow out into the sea, carrying nutrients in its wake.
What the researchers did
This is why the number of melt ponds is on the rise
Barcelona, Spain (SPX) Apr 02, 2017
Overfishing is one among many environmental problems that scientists expect to be exacerbated by climate change. A new study by the Institute of Environmental Science and Technology of the Universitat Autonoma de Barcelona (ICTA-UAB) published in Nature Communications confirms that climate change poses a major threat for the global fishery, but shows that the continual improvement of fishing tec ... read more
University of Southern Denmark
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