LICHENS IN HIGH ARCTIC ECOSYSTEMS: Recommended research directions for assessing diversity and function near the Canadian High Arctic Research Station, Cambridge Bay, Nunavut

2019 ◽  
Vol 1 (1) ◽  
pp. 1-8
Author(s):  
Ian Hogg ◽  
◽  
Leo Sancho ◽  
Roman Turk ◽  
Don Cowan ◽  
...  
Keyword(s):  
High Arctic ◽  
Research Station ◽  
Arctic Ecosystems ◽  
Canadian High Arctic ◽  
Research Directions ◽  
And Function

CO2 exchange in three Canadian High Arctic ecosystems: response to long-term experimental warming

2004 ◽  
Vol 10 (12) ◽  
pp. 1981-1995 ◽  
Author(s):  
Jeffrey M. Welker ◽  
Jace T. Fahnestock ◽  
Greg H. R. Henry ◽  
Kevin W. O'Dea ◽  
Rodney A. Chimner
Keyword(s):  
High Arctic ◽  
Co2 Exchange ◽  
Experimental Warming ◽  
Arctic Ecosystems ◽  
Canadian High Arctic

scholarly journals Abundance, habitat use and food consumption of seabirds in the high-Arctic fjord ecosystem

Polar Biology ◽  
2021 ◽  
Vol 44 (4) ◽  
pp. 739-750
Author(s):  
Lech Stempniewicz ◽  
Michał Goc ◽  
Marta Głuchowska ◽  
Dorota Kidawa ◽  
Jan Marcin Węsławski
Keyword(s):  
High Arctic ◽  
Pelagic Zone ◽  
The Arctic ◽  
Arctic Ecosystems ◽  
Rissa Tridactyla ◽  
Arctic Fjord ◽  
Main Components ◽  
And Function ◽  
Arctic Food Web ◽  
Induced Changes

AbstractTo monitor the rapid changes occurring in Arctic ecosystems and predict their direction, basic information about the current number and structure of the main components of these systems is necessary. Using boat-based surveys, we studied the numbers and distribution of seabirds foraging in Hornsund (SW Spitsbergen) during three summer seasons. The average number of seabirds foraging concurrently in the whole fjord was estimated at 28,000. Little Auks Alle alle were the most numerous, followed by Northern Fulmars Fulmarus glacialis, Brünnich’s Guillemots Uria lomvia and Black-legged Kittiwakes Rissa tridactyla. The pelagic zone was exploited by some 75% of the birds. Their density was the highest (> 400 ind. km−2) in the tidewater glacier bays, where kittiwakes were predominant, and the lowest in the coastal glacier bays. The seabirds in Hornsund daily consumed c. 12.7 tons of food, i.e. c. 0.2% of the summer mesozooplankton and fish standing stocks available in the fjord. This food consisted primarily of copepods, amphipods and molluscs (c. 70%), whereas fish made up < 15%. More than 50% of this biomass was ingested by pursuit divers, while surface feeders took c. 29% and benthophages c. 13%. About three-quarters of the food biomass was taken from the pelagic zone. This paper describes, for the first time in quantitative terms, the structure and function of a seabird community foraging in an Arctic fjord. It also provides a baseline for future studies on climate-induced changes in the importance of seabirds in the Arctic food web.

Perennial spring occurrence in the Expedition Fiord area of western Axel Heiberg Island, Canadian High Arctic

1999 ◽  
Vol 36 (1) ◽  
pp. 105-120 ◽  
Author(s):  
Wayne Pollard ◽  
Chris Omelon ◽  
Dale Andersen ◽  
Chris McKay
Keyword(s):  
Freezing Point ◽  
Discharge Rate ◽  
High Arctic ◽  
Research Station ◽  
Freezing Point Depression ◽  
Canadian High Arctic ◽  
Mcgill University ◽  
Axel Heiberg Island ◽  
The Individual ◽  
Total Discharge

This paper documents perennial spring activity at Expedition Fiord on western Axel Heiberg Island in the Canadian High Arctic. Two groups of mineralized springs occur near the McGill University Axel Heiberg Research Station located at 79°26'N, 90°46'W. The first is at Gypsum Hill, 3 km from the terminus of the White and Thompson glaciers, and the second site is at Colour Peak, approximately 10 km downvalley near the head of Expedition Fiord. Each spring group consists of 20-40 vents spread over several hundred square metres. The highly mineralized nature of the discharge causes a freezing-point depression of 7-10°C and produces a range of precipitates and travertine deposits. Year-round water temperature and discharge rate measurements have been obtained, demonstrating perennial activity at these sites. Results indicate that temperatures range from -4.0 to 6.6°C among the individual sources; however, water temperatures at the various outlets remain constant throughout the year despite a mean annual air temperature of -15°C. Although discharge from any one outlet is low (<0.5 to 2.0 L/s), the total discharge is substantial, each year producing several seasonal frost mounds and an icing 180 000 - 300 000 m2 at the Gypsum Hill site.

Overview of analogue science activities at the McGill Arctic Research Station, Axel Heiberg Island, Canadian High Arctic

2009 ◽  
Vol 57 (5-6) ◽  
pp. 646-659 ◽  
Author(s):  
Wayne Pollard ◽  
Tim Haltigin ◽  
Lyle Whyte ◽  
Thomas Niederberger ◽  
Dale Andersen ◽  
...  
Keyword(s):  
High Arctic ◽  
Research Station ◽  
Canadian High Arctic ◽  
Axel Heiberg Island ◽  
Science Activities

Structural variation in the songs of Atlantic walruses breeding in the Canadian High Arctic

2003 ◽  
Vol 29 (2) ◽  
pp. 297-318 ◽  
Author(s):  
Becky Sjare ◽  
Ian Stirling ◽  
Cheryl Spencer
Keyword(s):  
Structural Variation ◽  
High Arctic ◽  
Canadian High Arctic
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