On the Influence of the Arctic Fox Alopex lagopus on the Distribution of Arctic Birds

Oikos ◽  
1960 ◽  
Vol 11 (2) ◽  
pp. 276 ◽  
Author(s):  
Sten Larson
Keyword(s):  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus

scholarly journals Energy Cost of Running in an Arctic Fox, Alopex lagopus

2003 ◽  
Vol 117 (3) ◽  
pp. 430 ◽  
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.

PARASITES OF THE ARCTIC FOX (ALOPEX LAGOPUS) IN ICELAND

1993 ◽  
Vol 29 (3) ◽  
pp. 440-446 ◽  
Author(s):  
K. Skirnisson ◽  
M. Eydal ◽  
E. Gunnarsson ◽  
P. Hersteinsson
Keyword(s):  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus

Effect of age and breeding season on sperm acrosin activity in the arctic fox (Alopex lagopus L.)

2014 ◽  
Vol 17 (1) ◽  
pp. 177-179 ◽  
Author(s):  
K. Stasiak ◽  
B. Janicki
Keyword(s):  
Breeding Season ◽  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus ◽  
A Value ◽  
Arctic Foxes ◽  
The Mean ◽  
One Year ◽  
Acrosin Activity ◽  
Effect Of Age

Abstract The objective of this study was to determine the effect of age and reproductive season on selected properties of semen from the arctic fox, Alopex lagopus L. The experiment used 40 ejaculates collected manually from 6 animals (3 foxes aged one year and 3 foxes older than three years). Statistically less semen (0.39 cm3) was collected from the young compared to the older animals, and the ejaculates obtained were characterized by higher concentration of spermatozoa (195.04 x 106/cm3). In turn, sperm acrosomal extracts from the older animals contained statistically more acrosin (6,4 mU/106 spermatozoa). In the sperm acrosomal extracts prepared during the first semen sampling, the mean acrosin activity did not exceed 2.3 mU/million spermatozoa. At subsequent semen sampling dates, the activity of the analysed enzyme increased to reach 7.72mU/million spermatozoa. In the extracts obtained from the semen collected at the end of the breeding season of arctic foxes, the acrosin activity again reached a value obtained at the beginning of the season.

The arctic fox (Alopex lagopus): an opportunistic specialist

2000 ◽  
Vol 251 (2) ◽  
pp. 139-149 ◽  
Author(s):  
Bodil Elmhagen ◽  
Magnus Tannerfeldt ◽  
Paolo Verucci ◽  
Anders Angerbjorn
Keyword(s):  
The Arctic ◽  
Arctic Fox ◽  
Alopex Lagopus

Age determination in the arctic fox (Alopex lagopus)

1981 ◽  
Vol 59 (10) ◽  
pp. 1976-1979 ◽  
Author(s):  
J. A. Bradley ◽  
D. Secord ◽  
L. Prins
Keyword(s):  
Age Determination ◽  
Canadian Arctic ◽  
Accurate Method ◽  
Linear Measurement ◽  
The Arctic ◽  
First Year ◽  
Arctic Fox ◽  
Alopex Lagopus ◽  
Pulp Cavity

Canine teeth from foxes (Alopex lagopus) trapped in the Canadian arctic were aged by counting annular layers in the cementum. Of 513 teeth examined by this method, 448 were from foxes <1 year of age. Only 11% of those caught in February of their first year had a developing incremental line, compared with 77% in foxes >1 year. Simple linear measurement of the anteroposterior width of the pulp cavity was found to be an accurate method of aging 80% of juveniles.

Trichinella nativa in Iceland: an example of Trichinella dispersion in a frigid zone

2009 ◽  
Vol 84 (2) ◽  
pp. 182-185 ◽  
Author(s):  
K. Skírnisson ◽  
G. Marucci ◽  
E. Pozio
Keyword(s):  
Host Species ◽  
Polar Bear ◽  
The Arctic ◽  
Arctic Fox ◽  
Polar Bears ◽  
Alopex Lagopus ◽  
Zoonotic Pathogen ◽  
Arctic Regions ◽  
Epidemiological Features ◽  
Trichinella Nativa

AbstractIn most Arctic and subarctic regions, Trichinella nativa is a common zoonotic pathogen circulating among wild carnivores. The polar bear (Ursus maritimus) is one of the most important reservoirs for T. nativa in frigid zones. In Iceland, Trichinella infection has never been detected in the local wildlife, despite the presence of one of the host species, the arctic fox (Alopex lagopus). In 2008, one of two polar bears that had swum to Iceland's coast was found to have been infected with Trichinella sp. (8.5 larvae/g in the tongue, 6.8 larvae/g in the masseter and 4.4 larvae/g in the diaphragm); the larvae were identified as T. nativa. This is the second report of Trichinella infection in polar bears that reached the Icelandic coast. In the present work, we describe this case of infection and discuss the epidemiological features that have allowed T. nativa to spread in Arctic regions.

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