scholarly journals Palaeoenvironmental Interpretation of Late Quaternary Marine Molluscan Assemblages, Canadian Arctic Archipelago

2002 ◽  
Vol 54 (3) ◽  
pp. 301-315 ◽  
Author(s):  
Sandra Gordillo ◽  
Alec E. Aitken
Keyword(s):  
Environmental Factors ◽  
Species Composition ◽  
Continental Shelf ◽  
Marine Sediments ◽  
High Latitude ◽  
Late Quaternary ◽  
Canadian Arctic ◽  
High Arctic ◽  
Canadian Arctic Archipelago ◽  
Preservation Potential

Abstract This study examines neonto- logical and palaeontological data pertaining to arctic marine molluscs with the goal of reconstructing the palaeoecology of Late Quaternary ca. 12-1 ka BP glaciomarine environments in the Canadian Arctic Archipelago. A total of 26 taxa that represent 15 bivalves and 11 gastropods were recorded in shell collections recovered from Prince of Wales, Somerset, Devon, Axel Heiberg and Ellesmere islands. In spite of taphonomic bias, the observed fossil faunas bear strong similarities to modern benthic molluscan faunas inhabiting high latitude continental shelf environments, reflecting the high preservation potential of molluscan taxa in Quaternary marine sediments. The dominance of an arctic-boreal fauna represented by Hiatella arctica, Mya truncata and Astarte borealis is the product of natural ecological conditions in high arctic glaciomarine environments. Environmental factors controlling the distribution and species composition of the Late Quaternary molluscan assemblages from this region are discussed.

scholarly journals On the Thermal Regime of a High-Arctic Valley Glacier

1976 ◽  
Vol 16 (74) ◽  
pp. 119-133 ◽  
Author(s):  
Fritz Müller
Keyword(s):  
Thermal Regime ◽  
Energy Input ◽  
Canadian Arctic ◽  
High Arctic ◽  
Canadian Arctic Archipelago ◽  
Valley Glacier ◽  
Drilling Technique ◽  
Percolation Zone ◽  
Mean Annual Air Temperature ◽  
Upper Boundary

AbstractThe 10 m temperatures were measured over several years at 16 sites on the White Glacier (lat. 80° N.), Axel Heiberg Island, Canadian Arctic Archipelago. At three sites deep profiles were made using a new drilling technique, reaching a maximum depth of 280 m. Large differences in the 10 m temperatures between locations and from year to year were observed. The deviations of these temperatures from the almost isothermal mean annual air temperature over the glacier are discussed. The heating effect of the melt water in the lower percolation zone was found to be very important. A conceptual model is developed to assess the influence of these irregularities in the energy input at the upper boundary on the thermal regime of the entire glacier. So far a quantitative analysis has been made only for the relatively simple 30 m temperature profile measured on the tongue of the glacier.

The career and disappearance of Hans K.E. Krüger, Arctic geologist, 1886–1930

Polar Record ◽  
1993 ◽  
Vol 29 (171) ◽  
pp. 277-304 ◽  
Author(s):  
William Barr
Keyword(s):  
Continental Shelf ◽  
Canadian Arctic ◽  
Field Work ◽  
Ellesmere Island ◽  
Canadian Arctic Archipelago ◽  
Royal Canadian Mounted Police ◽  
West Greenland

ABSTRACTOn 19 March 1930 the German geologist, Hans K.E. Krüger, accompanied by a Dane, Åge Rose Bjare, and an Inughuk, Akqioq (the latter driving their dog sledge) set off westwards from the Royal Canadian Mounted Police post at Bache Peninsula, Ellesmere Island; two support sledges, driven by Inughuit, escorted them. It appears to have been Krüger's intention to study the geology of the coasts of the outer islands of the Canadian Arctic archipelago and to carry out soundings of the continental shelf and slope. The two support sledges turned back at Depot Point, Eureka Sound. Krüger, Bjare, and Akqioq were never seen again. This article reviews Krüger's background, his preparations for the expedition (which included two summers of field work in West Greenland and a wintering in northwest Greenland), and the extensive searches mounted by the RCMP in 1931 and 1932. Finally, it analyzes the evidence provided by three messages left by Krüger and subsequently recovered, with a view to making an educated guess as to the fate of the expedition.

Thyasira dunbari n.sp. (Bivalvia: Thyasiridae) from the Canadian Arctic Archipelago

1976 ◽  
Vol 33 (8) ◽  
pp. 1667-1670 ◽  
Author(s):  
Irene Lubinsky
Keyword(s):  
Shallow Water ◽  
Canadian Arctic ◽  
High Arctic ◽  
Shell Morphology ◽  
Canadian Arctic Archipelago ◽  
East Greenland ◽  
Shallow Water Species ◽  
Water Species

The shell morphology and area of distribution of Thyasira dunbari n.sp. is described and illustrated. This species differs from its northern relatives, especially T. gouldi Phil., by its high, bent forward shell, and thin, long edentulous hinge with massive callus. It occurs in the northernmost part of the Canadian archipelago and off East Greenland. It is a high arctic shallow-water species, which seems to be endemic in the Canadian–Greenlandic region.

Floral colors in the high arctic with reference to insect–flower relations and pollination

1972 ◽  
Vol 50 (11) ◽  
pp. 2289-2316 ◽  
Author(s):  
Peter G. Kevan
Keyword(s):  
Canadian Arctic ◽  
High Arctic ◽  
Canadian Arctic Archipelago ◽  
Color Patterns ◽  
Flower Visitors ◽  
Spectral Reflection ◽  
Color Changes ◽  
Special Groups ◽  
Crab Spider

Some review, concepts, terminology, and methods are given towards the description of colors, here, of flowers of the high arctic flora of the Canadian Arctic Archipelago, in the insect (including ultraviolet) and human visual spectra. Photographs and spectral reflection curves are given. The various flower colors found elsewhere do not occur in the same proportions in the high arctic where white and yellow predominate. Ultraviolet is reflected from several yellow (insect-red) flowers, making them insect-purple. Patterns and markings in the ultraviolet or other colors may be simple or complex, but cannot be described as honey-guides. To insects, the high arctic flowers of the different species have more distinctive colors and color patterns, and there are more different colors and color patterns, than there are to humans. Most flowers have greater luminance factors than do their backgrounds so stand out as different in color and brightness. Yellow flowers (with or without ultraviolet) are the most attractive to insects; other colored flowers are visited by special groups of insects or when yellow flowers are not available, or both. Color alone cannot account for the attractiveness or unattractiveness of some blooms. Some flower visitors are found in flowers in which they would be least conspicuous, and cryptic color changes may operate in the high arctic crab spider.

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