Aarhus University Seal / Aarhus Universitets segl


2018.11.06 | Arctic Research Centre

Maskiningeniør-studerende fra Aarhus Universitet har vundet international pris.

Tre maskiningeniør-studerende fra Aarhus Universitet har vundet National Instruments internationale Student Design Award for deres bacheloropgave.

2018.11.03 | Arctic Research Centre

Countries Urge Increased International Research in the Arctic

A joint statement from countries with interests in the Arctic emphasizes the need for scientific collaboration in this rapidly changing region but sidesteps attributing climate change to human activities.

2018.10.25 | Arctic Research Centre

Zooplankton phenology may explain the North Water polynya’s importance as a breeding area for little auks.

New publication by Eva Friis Møller, Kasper Lambert Johansen, Mette Dalgaard Agersted, Frank Rigét, Daniel Spelling Clausen, Janus Larsen, Peter Lyngs, Ane Middelbo, and Anders Mosbech.

2018.10.23 | Arctic Research Centre

Oxygen fluxes beneath Arctic land-fast ice and pack ice : towards estimates of ice productivity.

New publication by Karl M. Attard, Dorte H. Søgaard, Judith Piontek, Benjamin A. Lange, Christian Katlein, Heidi L. Sørensen, Daniel F. McGinnis, Lorenzo Rovelli, Søren Rysgaard, Frank Wenzhöfer, Ronnie N. Glud

2018.10.23 | Arctic Research Centre

Special Section Introduction : Socioecological Disequilibrium in the Circumpolar North.

New publication by Felix Riede, Toke T. Høye, Pelle Tejsner, Djuke Veldhuis, Rane Willerslev

2018.10.23 | Arctic Research Centre

Spatio-temporal dynamics of macroinvertebrate communities in northeast Greenlandic snowmelt streams.

New publication by Catherine L. Docherty, David M. Hannah, Tenna Riis, Magnus Lund, Jakob Abermann, Alexander M. Milner

2018.10.23 | Arctic Research Centre

Seasonal succession, distribution, and diversity of planktonic protists in relation to hydrography of the Godthåbsfjord system (SW Greenland).

New publication by D. W. Krawczyk, L. Meire, C. Lopes, T. Juul-Pedersen, J. Mortensen, C. L. Li, T. Krogh

2018.10.23 | Arctic Research Centre

Screening of cold tolerance in fifteen springtail species.

New publication by Martin Holmstrup

2018.10.23 | Arctic Research Centre

Plant functional trait change across a warming tundra biome.

New publication by Bjorkman, Anne D.; Myers-Smith, Isla H.; Elmendorf, Sarah C.; Normand, Signe; Rueger, Nadja; Beck, Pieter S. A.; Blach-Overgaard, Anne; Blok, Daan; Cornelissen, J. Hans C.; Forbes, Bruce C.; Georges, Damien; Goetz, Scott J.; Guay, Kevin C.; Henry, Gregory H. R.; HilleRisLambers, Janneke; Hollister, Robert D.; Karger, Dirk N.;…

2018.10.11 | Arctic Research Centre

Afbrænding af olie på havet er en lovende metode til bekæmpelse af oliespild i Arktis

I en kort film fortælles i ord og billeder om et olieafbrændingsforsøg i Grønland.

2018.10.11 | Arctic Research Centre

Årets originale forskningsidé bygger på big data og machine learning

Forsker vil tage billeder af insekter i Arktis for at undersøge klimaændringernes påvirkning af bestøvning

2018.10.09 | Arctic Research Centre

Expanding Greenland seagrass meadows contribute new sediment carbon sinks

New publication by Núria Marbà, Dorte Krause-Jensen, Pere Masqué & Carlos M. Duarte

2018.10.09 | Arctic Research Centre

Predicting global killer whale population collapse from PCB pollution

New publication by Jean-Pierre Desforges, Ailsa Hall, Bernie McConnell, Aqqalu Rosing-Asvid, Jonathan L. Barber, Andrew Brownlow, Sylvain De Guise, Igor Eulaers, Paul D. Jepson, Robert J. Letcher, Milton Levin, Peter S. Ross, Filipa Samarra, Gísli Víkingsson, Christian Sonne-Hansen and Rune Dietz.

Figure 1: PCB transport in the food chains: When foreign hazardous substances enter the marine environment, they are assimilated into the first link in the food chain, phytoplankton. The phytoplankton is consumed by zooplankton, which in turn is consumed by smaller fish, etc. The chemicals accumulate in each link of the food chain, and this means that killer whales that feed on large animals in contaminated areas may contain concentrations of PCBs so high that the survival of the species is threatened. Killer whales that primarily feed on smaller fish are not threatened in the same way.
Figure 2: Population development: By collecting data from around the world and loading them into population models, the researchers can see that 10 out of 19 populations of killer whales are affected by high levels of PCBs in their body. PCBs particularly affect the reproduction and immune system of the whales. The situation is worst in the oceans around Brazil and the UK where the model predicts that populations have been cut in half over the first decades since the use of PCBs became widespread. Here, the models predict a high risk that the species will disappear within a 30-40-year period. The line indicates median values, while the shaded field shows the variation.
Killer whale: In some areas, killer whales feed primarily on sea mammals and big fish like tuna and sharks and are then threatened by PCBs. In areas where the killer whales primarily feed on small fish like herring, they are less threatened. Photo: Audun Rikardsen – www.audunrikardsen.com
Killer whale under water: When killer whales like these hunt small fish like herring, the exposure to PCBs is much less than if they fed on large fish or marine mammals. Photo: Audun Rikardsen - www.audunrikardsen.com
Hunting killer whales: Killer whales hunt together to gather fish in big, isolated schools. Photo: Audun Rikardsen – www.audunrikardsen.com

2018.09.28 | Arctic Research Centre

PCB pollution threatens to wipe out killer whales

More than forty years after the first initiatives were taken to ban the use of PCBs, the chemical pollutants remain a deadly threat to animals at the top of the food chain. A new study, just published in the journal Science, shows that the current concentrations of PCBs can lead to the disappearance of half of the world’s populations of killer…

2018.09.26 | Arctic Research Centre

Højere plantearter flytter ind i et varmere Arktis

Den arktiske tundras lavt voksende buske og græsarter er på vej til at blive overskygget af højere plantearter, som spreder sig ind over tundraen. Tun-draplanternes gennemsnitshøjde er generelt steget i takt med stigende temperaturer de sidste tre årtier. Det kan være med til at sætte ekstra fart i den globale opvarmning.

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