Spatial distribution of lemming mats in the Canadian High Arctic

1983 ◽  
Vol 61 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Frank F. Mallory ◽  
Barry N. Boots
Keyword(s):  
High Arctic ◽  
Social Processes ◽  
Home Ranges ◽  
Nearest Neighbour ◽  
Canadian High Arctic ◽  
Beach Ridges ◽  
Polygon Area ◽  
Dicrostonyx Groenlandicus ◽  
Core Areas ◽  
The Mean

Spatial distributions of lemming mats on exposed beach ridges on Bathurst and Devon islands, N. W.T., in the Canadian High Arctic were recorded by triangulation. The collared lemming Dicrostonyx groenlandicus is the only microtine in this region, which eliminates interspecific influences. In addition, vegetation is sparse, making centres of activity easy to identify. Mats were relatively permanent structures with a mean diameter of 3.88 m and an average of 13.0 burrows. The mean nearest neighbour distance ranged from 40 to 45 m and the average mat polygon area (interpreted as territory or home range) was 0.34 ha. Individual mat polygons were contiguous with an average of 5.3 other polygons and the distribution of the mats over the environment was nonrandom. The data support the conclusion that lemming mats represent core areas within lemming territories or home ranges which are distributed regularly over the environment because of social processes which influence social interaction. The data are discussed as they apply to current theories on microtine demography and population dynamics.

scholarly journals Variability and change in Palaeo-Eskimo architecture: A view from the Canadian High Arctic

2005 ◽  
Vol 27 (1-2) ◽  
pp. 191-212 ◽  
Author(s):  
Patricia Sutherland
Keyword(s):  
Temporal Variation ◽  
Temporal Distribution ◽  
High Arctic ◽  
Structural Features ◽  
Social Processes ◽  
Situational Factors ◽  
Symbolic Meaning ◽  
Canadian High Arctic ◽  
Historical Events

Abstract This paper explores the nature and causes of geographical and temporal variation in the architectural remains of Palaeo-Eskimo occupation in the High Arctic. It is suggested that much of the variability in the architectural record relates to local and situational factors rather than to cultural prescription. Three structural features — the box-hearth, midpassage and longhouse — are selected as representing a complex of elements with broad geographical and temporal distribution, and which may have had symbolic meaning related to Palaeo-Eskimo society and worldview. Changes in the form and distribution of these features are summarized, and the degree to which these variations may reflect social processes and historical events is examined.

scholarly journals Spatial pattern of ASG-EUPOS sites

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Beata Calka ◽  
Elzbieta Bielecka ◽  
Mariusz Figurski
Keyword(s):  
Spatial Pattern ◽  
Pattern Analysis ◽  
Transportation Network ◽  
Distribution Model ◽  
Spatial Pattern Analysis ◽  
Nearest Neighbour ◽  
Polygon Area ◽  
Thiessen Polygon ◽  
Thiessen Polygons ◽  
The Mean

AbstractThe article presents the spatial pattern analysis of the ASG-EUPOS permanent GNSS stations in Poland. Using different methods and tools (nearest neighbour, Riplay’s K-function, morphology of Thiessen polygons) we proved that the station distribution model changes within scales. At short distances up to 65 km, which are typical lengths in the network, stations are irregularly dispersed. Increasing this distance to 130 km and over could result in a clustered pattern.The Thiessen polygon area in 72% depends on the level of urbanization, especially coverage of forested and built-up areas as well as the density of the transportation network. The smallest density of the ASG-EUPOS sites is one station over 10,000 sq. km, which is two times more than is stated in the national regulations. The mean distance from ASG-EUPOS location to the nearest station is about 41.5 km.

Home range, movement and habitat utilisation of the Carpentarian rock-rat (Zyzomys palatalis) in an isolated habitat patch

2004 ◽  
Vol 31 (3) ◽  
pp. 327 ◽  
Author(s):  
Helen Puckey ◽  
Milton Lewis ◽  
David Hooper ◽  
Carrie Michell
Keyword(s):  
Home Range ◽  
Radio Telemetry ◽  
Central Area ◽  
Limited Resource ◽  
Home Ranges ◽  
Habitat Patch ◽  
Minimum Convex Polygon ◽  
Significant Difference ◽  
Core Areas ◽  
The Mean

Radio-telemetry was used to examine the home range, movement and habitat utilisation of the critically endangered Carpentarian rock-rat (Zyzomys palatalis) in an isolated habitat patch in the Gulf of Carpentaria hinterland over a 13-month period. Two home-range estimators were used in the study, (i) minimum convex polygon (MCP) and (ii) fixed Kernel (KL), the latter also being used to estimate core areas of activity. Based on a total sample size of 21 individuals, the mean MCP home range was 11 165 m2, similar to the mean KL home range of 10 687 m2. Core areas were, on average, 11.9% of the KL home-range estimate. There was no significant difference in the size of home range or core area of males and females. Juveniles had a significantly smaller home range than adults. Home ranges and, to a lesser degree, core areas were non-exclusive, with multiple areas of overlap (averaging 41% and 38% respectively) within and between all age and gender categories, but especially between males and between juveniles. Movement frequencies showed that animals made many short forays in a central area close to the arithmetic home-range mean and far fewer long forays of distances greater than 100 m from the central area. The spatial and temporal activity of Z. palatalis was concentrated in, but not confined to, the 'valley' and 'slope' habitats, with fewer movements of rats onto the surrounding 'plateau'. Resource selection analyses showed that Z. palatalis tended to prefer valley and slope habitats over the plateau and that the proportion of point locations was significantly higher for adults in the slope habitat and for juveniles in the valley habitat. Most home ranges were centred on the ecotone between these two habitat types. Although isolated and spatially limited, these habitat patches provide high-quality resources for dense populations of Z. palatalis. This study exemplifies a species' attempt to make efficient use of a limited resource in an otherwise hostile environment. Even small declines in habitat area or quality due to their vulnerability to fire would impact upon many animals.

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

In situ optical and microphysical properties of tropospheric aerosols in the Canadian High Arctic from 2016 to 2019

2021 ◽  
Vol 250 ◽  
pp. 118254
Author(s):  
Andy Vicente-Luis ◽  
Samantha Tremblay ◽  
Joelle Dionne ◽  
Rachel Y.-W. Chang ◽  
Pierre F. Fogal ◽  
...  
Keyword(s):  
High Arctic ◽  
Canadian High Arctic ◽  
Microphysical Properties ◽  
Tropospheric Aerosols

scholarly journals Climate Change Drives Widespread and Rapid Thermokarst Development in Very Cold Permafrost in the Canadian High Arctic

2019 ◽  
Vol 46 (12) ◽  
pp. 6681-6689 ◽  
Author(s):  
Louise M. Farquharson ◽  
Vladimir E. Romanovsky ◽  
William L. Cable ◽  
Donald A. Walker ◽  
Steven V. Kokelj ◽  
...  
Keyword(s):  
Climate Change ◽  
High Arctic ◽  
Canadian High Arctic
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