A sediment filled Rumohr Lot corer is retrieved. Photo Naja Mikkelsen Small Arctic grazers Sandra Craveiro, Antonio Calado, Universit y of Aveiro, Por tugal, Øjvind Moestrup, Depar tment of Biology, Universit y of Copenhagen, Denmark, Andre as Altenburger, Amalia Keck, Nina Lundholm, Natural Histor y Museum of Denmark, Universit y of Copenhagen, Denmark Heterotrophic grazers, including heterotrophic dinoflagellates as well as ciliates were sampled, and single cells isolated imaged used light microscopy, and used for later molecular and ultrastructural studies. The data are being processed. The first dinoflagellate cell has been sliced and studied for detailed ultrastructure. The first phylogenetic trees will be ready soon. So the results are in process, but what we can say, is that we were struck by the diversity and abundance of the grazers. Ciliates with acquired phototrophy in arctic waters Per Juel Hansen, Ruth Anderson, Marine Biological Section, Universit y of Copenhagen, Denmark, Diane K. Stoecker, Horn Point laboratories, Universit y of Mar yland, United States We found 5 species of kleptoplastidic ciliates that were very common in the waters around Disko. The most common were Mesodinium major and Laboea stobila, but at least 3 other ciliates were also common. This included known species of Strombidium never reported from Greenland as well as one undescribed species that apparently are very common in arctic waters (gene-bank). We are currently investigating the prey types of these ciliates using PCR. Our preliminary results suggest that kleptoplastidic ciliates are key organisms in understanding the food web and fish production in arctic waters Mixotrophy among small arctic marine phytoflagellates prevalence and impact on prokaryotic communities 18 A R C T I C S TAT I O N Ruth Anderson, Per Juel Hansen, Marine Biological Section, Universit y of Copenhagen, Denmark Mixotrophy, i.e., the use of photosynthesis and prey consumption for growth, is now known to be a common strategy among unicellular flagellated alage (phytoflagellates). The magnitude of this phenomenon has important implications for both nutrient cycling and marine food webs. However, the levels and regulation of mixotrophy in arctic waters remain virtually unknown. Here, we investigated how light and nutrient availability influences the feeding of phytoflagellates on bacteria during the arctic summer. Sediment sampling of raised beach ridges at Lakse Bugt and Tuapaat on Disko Priscila Emerich Souza, Science without Border/Universit y of Copenhagen, Denmark, Bruno Kabke Bainy, A sger Meldgaard, Universit y of Copenhagen, Denmark, Sigurd Bohr The project focused on dating of internal beach ridge structures. The main activities included field visits to well-known beach ridge systems on Disko. Sediments of these beach ridges were sampled (gravels and stones) at different heights and at different levels on different ridges. These sediments were used for testing and further elaborating the method on rock surface OSL dating at the Nordic Laboratory for Luminiscence Dating, University of Aarhus, campus Risø DTU in Denmark. The dates of different beach ridges will be used to reconstruct relative sea-level variations through parts of the Holocene. Arctic soils and biogenic volatile organic compounds Riikka Rinnan, Magnus Kramshøj Adolph, Department of Biology, University of Copenhagen, Denmark, Christian Albers, GEUS, Denmark The role of non-methane biogenic volatile organic compounds (BVOCs, e.g. isoprene and monoterpenes) in soil is poorly understood. In this project we assess the importance of arctic soils as a source and a sink for BVOCs. The first results suggest that the concentrations of BVOCs in arctic soil have high spatial and temporal variation. The aboveground vegetation seems to be one of the most important factors explaining the variation. Measuring biogenic volatile organic compounds in Blæsedalen. Photo Riikka Rinnan???? university of copenhagen facu lt y of sci e nc e A RC T I C STAT I ON Annual Repor t 2016 2 A R C T I C S TAT I O N ARCTIC STATION Annual Report 2015 CONTENTS Chairmans welcome ............................................................. 5 DiskoBasis monitoring ............................................................ 7 Research projects.................................................................. 15 Edu 4 A R C T I C S TAT I O N Chairmans Welcome Professor Bo Elberling Arc tic Station is one of the oldest arc tic field stations and has been impor tant for research at Disko Island and the Disko Bay for more than 10 0 years. The station is an unique site and surrounded by a high diversit y of ecosystems; not the least remar Rød elv Figure 1. New weather station (AWS4) on Skarvefjeld, 240 meter above sea level (69.27282 N, 053.45363W). The map shows the location of places where air temperature are being logged in a transect from sea level (T4) to 830 m asl (T2). Blæsedale n Greeland Disko Island Lyngmarksfjeld 5 DiskoBasis Monitoring 2016 Charlotte Sigsgaard, Casper Tai Christiansen, Mathilde Jammet, Per Juel Hansen, Kirsten S. Christoffersen, Aart Kroon, Thomas Friborg, Birger Ulf Hansen, Bo Elberling DiskoBasis is the ecosystem monitoring program at Arc tic Station. The program has increased the monitori 1040 Wind speed (m s-1) 31 Jan 2 Mar 1 Apr 1 Maj 31 Maj 30 Jun 30 Jul 29 Aug 28 Sep 28 Oct 27 Nov 27 Dec 2016 1000 960 40 10 30 0 20 -10 -20 10 -30 0 16 12 8 4 Wind dir (o) 0 300 200 100 Snow depth (m) 0 0.8 0.6 0.4 0.2 Ground temp (oC) Soil moisture (Vol%) 0 80 10 Figure 7. Precipitation/ rain measured just outside Arctic Station (AWS1). Stacked monthly amounts from May to September are shown Sep from 1991 to 2016. Missing years are due Aug to malfunction of the equipment. Jul 400 350 Precipitation (mm) 300 250 200 Jun 150 May 100 50 0 1991 1993 1995 1 Figure 9. Photos of multisonde location on 15 May, 22 May and 11 June 2016. Massive snow melt and high water levels create turbulence along the cliff on the eastern brink when water is forced around the rock outcrop and causes fluctuations in the water level during the peak runoff periods. Photo Cas Figure 11. The location of the multisonde in Røde Elv (69 15 13N, 53 29 53W, 3 m asl. and ca 460 m from the coast, -see Figure 2). A wire was installed across the river in order to pull the Q-liner from side to side in the crossing. The river is 12 meter wide at this time and measurements were perfo Figure 12.Sampling of lake water 19 February 2016. Photo Kirsten Christoffersen ac terized by fairly harsh conditions above the lake sur face and limited biological ac tivit y below the ice due to darkness. The conditions are much milder in the spring (May in Table 1), snow is melting, ice thicknes 7,8 8 pH 8,2 8,4 8,6 0 50 Depth (meter) 100 Figure 13. Seasonality in pH measured from near surface water to 300 meters depth at the Fast station in Disko Bay 2016 (691114, 533107). 11-May 25-Jun 150 25-Jul 30-Aug 200 01-Oct 24-Oct 250 28-Nov 300 350 decreased to ca 8.0 due to the 14 A R C T I C S TAT I O N Research Projects Effects of dispersed oil droplets and produced water components on growth, development and reproduction in Arctic pelagic copepods (PWC-Arctic) Anders Johny Olsen, Iurgi Imanol Salaverria-Zabalegui, Nor wegian Universit y of Science and Technology (NTNU), Nor way, Ida Beathe Øverjo Sampling tidal algae at Kronprinsens Ejland. Photo Carlos M. Duarte Kelp forests in Greenland functional roles and response to climate change Dor te Krause -Jensen, Aarhus Universit y, Denmark, Carlos M. Duar te, K AUST Saudi-Arabia and Aarhus Universit y af filiation We studied the role of Arcti in Disko Bay Jakob Abermann, A siaq, Greenland Sur vey, Greenland This project focused on assessing the potential of integrating the ecosystem monitoring at Disko Bay in a GEM perspective. We performed pilot studies that narrowed down the scope and used the uniqueness of Arctic Station (AS) both in A sediment filled Rumohr Lot corer is retrieved. Photo Naja Mikkelsen Small Arctic grazers Sandra Craveiro, Antonio Calado, Universit y of Aveiro, Por tugal, Øjvind Moestrup, Depar tment of Biology, Universit y of Copenhagen, Denmark, Andre as Altenburger, Amalia Keck, Nina Lundholm, Natural Histor Sampling of snow on the glacier. Photo Tobias Luthe A n n u a l R e p o r t 2016 19 Ready for field work on the ice in Disko Bay. Photo Nina Lundholm 20 A R C T I C S TAT I O N A n n u a l R e p o r t 2016 21 Photo Kent Pørksen 22 A R C T I C S TAT I O N Education Arctic Biology Field Course Michelle S. Svendsen, Klara A . Rask, Søren R. Nielsen, Cecilie K. Hedemand, Sissel L. Fredsgaard, Nanna Devantier, Frederik F. Gai (students); Kirsten S. Christof fersen, Anders Michelsen (teachers). Depar tment of Biology, Universit y of Copenhagen, Denmark. T GUX-Aasiaat Geography Fieldtrip 2016 Teachers: David N. Penney and Karen Bengtson, GUX-Aasiaat (Nor th Greenlands Senior High School). Par ticipants: Geography students from 2nd class (Natural Sciences), GUX-Aasiaat. In September, 2016, a group of eleven 2nd year Ge ography students and t wo teacher A n n u a l R e p o r t 2016 25 Visits and public outreach GEM Workshop on 9-11 August 2016 at Arctic Station A work shop was held at Arc tic Station about the ongoing monitoring and future plans for Arc tic Station to be a monitoring site under Greenland Ecosystem Monitoring (GEM). All together 16 par ticipants from Universit y o Publications Scientific papers 2016 B l o k , D., Elb e r lin g, B., M i ch e ls e n, A . (2016 ). I ni t ia l s t a g e s of Tun d ra Shr u b L i t te r d e co m p o s i t i o n may b e a cce l e rate d by d e e p e r w inte r sn o w b u t s l o w e d d o w n by summ e r wa r m ing. Eco s y s te ms 28 A R C T I C S TAT I O N Members of the board Professor Bo Elberling (Chairman) Depar tment of Geosciences and Natural Resource Management Phone: + 45 3532 2520 E-mail: be@ign.ku.dk Git te Henrik sen (Secretar y) Facult y of Science Phone: + 45 3532 4256 E-mail: gin@science.ku.dk Professor MSO Kirsten Seestern Christof fers Title Arc tic Station Annual Repor t 2015 Publisher Board of the Arc tic Station, Univer sit y of Copenhagen, Denmark Editor A ar t Kroon and Charlot te Sigsgaard L ayout and graphic s Kent Pørk sen, Depar tment of Geosciences and Natural Resource Management Internet ver sion ark tisk station.ku.dk