Paleodistribution modeling suggests glacial refugia in Scandinavia and out‐of‐Tibet range expansion of the Arctic fox

Three data sets were available: records on conformation and coat traits for the arctic fox from one farm (5 540 observations, collected between 1983 and 1997), and the same traits for the silver fox from three farms (8 199 observations, collected between 1984 and 1999). The third set comprised 5 829 observations on reproductive performance of the arctic fox from one farm, collected between 1984 and 1999. The GLM procedure was used to test the significance of fixed effects on the analysed reproduction traits as well as differences between groups. Phenotypic trends as well as relationship and inbreeding across the studied years were computed. Most of the phenotypic trends were positive. Low relationship and inbreeding coefficients in the arctic and silver fox populations under study were estimated. The average relationship coefficients for the silver and arctic fox populations were 0.015 and 0.010, respectively, whereas the average inbreeding coefficients for the same species were 0.0039 and 0.0016, respectively. No inbreeding was found in the arctic fox breeding females.  

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An Individual-Based Model of the Population Dynamics of the Arctic Fox (Vulpes lagopus semenovi) on Mednyi Island, Commander Islands, North Pacific

Biology Bulletin ◽

10.1134/s106235901908003x ◽

2019 ◽

Vol 46 (8) ◽

pp. 929-945

Author(s):

M. E. Goltsman ◽

E. D. Sushko ◽

L. Doronina ◽

E. P. Kruchenkova

Keyword(s):

Population Dynamics ◽

North Pacific ◽

The Arctic ◽

Arctic Fox ◽

Vulpes Lagopus ◽

Commander Islands ◽

Individual Based Model

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Territorial Behavior of Short-eared Owls, Asio flammeus, at more than 1000 km North of their Current Breeding Range in Northeastern Canada: Evidence of Range Expansion?

The Canadian Field-Naturalist ◽

10.22621/cfn.v124i1.1032 ◽

2010 ◽

Vol 124 (1) ◽

pp. 58

Author(s):

Jean-François Therrien

Keyword(s):

Climate Change ◽

Range Expansion ◽

Territorial Behavior ◽

The Arctic ◽

Eastern Canada ◽

Breeding Range ◽

North Eastern ◽

Asio Flammeus

A pair of Short-eared Owls was observed throughout the summer of 2008 showing territorial behavior more than 1000 km north of their known breeding range in north-eastern Canada. These observations might be related to high lemming densities and/or climate change occurring in the Arctic.

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Energy Cost of Running in an Arctic Fox, Alopex lagopus

The Canadian Field-Naturalist ◽

10.22621/cfn.v117i3.746 ◽

2003 ◽

Vol 117 (3) ◽

pp. 430 ◽

Cited By ~ 4

Author(s):

Eva Fuglei ◽

Nils A. Øritsland

Keyword(s):

Heart Rate ◽

Metabolic Rate ◽

Energy Cost ◽

The Arctic ◽

Arctic Fox ◽

Alopex Lagopus ◽

Energy Cost Of Running ◽

Radio Transmitters ◽

The Relationship ◽

Determine Effect

This work was conducted to determine effect of season and starvation on metabolic rate during running in the Arctic Fox (Alopex lagopus) on Svalbard (78°55’N, 11°56’E), Norway. Indirect calorimetry was used to measure metabolic rate of foxes running on a treadmill and heart rate was monitored using implanted radio transmitters. The relationship between heart rate and metabolic rate was also examined. Metabolic rate increased with running speed. In July the metabolic rate during running almost fitted general equations predicted for mammals, while it was up to 20% lower in January, indicating seasonal variation in metabolic rate. There was a significant positive linear relationship between heart rate and weight specific metabolic rate, suggesting that heart rate can be used as an indicator of metabolic rate. Starvation for 11 days decreased the net cost of running by 13% in January and 17% in July, suggesting that a starved fox runs more energetically efficient than when fed. Heart rate measured in July decreased by 27% during starvation. Re-feeding reversed the starvation-induced reduction in metabolic rate and heart rate during running almost up to post-absorptive levels. The present results are from one fox, and must be considered as preliminary data until further studies are conducted.

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