Fluctuating Resources and the Evolution of Litter Size in the Arctic Fox

Oikos ◽  
1998 ◽  
Vol 83 (3) ◽  
pp. 545 ◽  
Author(s):  
Magnus Tannerfeldt ◽  
Anders Angerbjörn ◽  
Anders Angerbjorn
Keyword(s):  
Litter Size ◽  
The Arctic ◽  
Arctic Fox ◽  
Fluctuating Resources

Placental Scars and Estimation of Litter Size: An Experimental Test in the Arctic Fox

1995 ◽  
Vol 76 (4) ◽  
pp. 1220-1225 ◽  
Author(s):  
O. Strand ◽  
T. Skogland ◽  
T. Kvam
Keyword(s):  
Litter Size ◽  
Experimental Test ◽  
The Arctic ◽  
Arctic Fox

scholarly journals Breeding value evaluation in Polish fur animals: Estimates of direct heritability and portion of litter variation of fur coat and reproduction traits

2011 ◽  
Vol 49 (No. 11) ◽  
pp. 474-482 ◽  
Author(s):  
H. Wierzbicki
Keyword(s):  
Litter Size ◽  
Variance Components ◽  
Linear Models ◽  
The Arctic ◽  
Arctic Fox ◽  
Probability Scale ◽  
Birth Season ◽  
Silver Fox ◽  
Normal Probability ◽  
Reproduction Traits

The study presents estimates of heritability for fur coat and reproduction traits in arctic and silver foxes kept on Polish farms. The estimates of variance components were calculated using the DFREML and single-trait animal models. Due to a discrete character of fur coat traits, they were analysed twice: (1) without normalisation of their scores distribution, (2) after the normal probability scale transformation of their scores. Linear models included random additive genetic and common litter environment effects, and fixed effects of farm × year × birth season in the silver fox or year × birth season in the arctic fox as well as the fixed effect of female age when the reproduction traits were analysed. Moreover, the estimation of variance components for fur coat traits was done by a linear model with (Model 2) or without (Model 1) inbreeding coefficients included as linear covariable. In the arctic fox accounting for inbreeding and the data transformation did not markedly influence the estimates of heritability and the portion of litter variation calculated for the fur coat traits. An inbreeding effect was negligible (except for body size – BS) likely due to the low inbred level of the arctic fox population. In the silver fox the comparison of estimates derived using 2 different linear models and 2 data sets revealed more differences than it was found in the arctic fox. Accounting for inbreeding usually led to lower estimates of heritability, mainly when heritabilities were derived from the normal probability scale-transformed data. Most of the estimates of heritability of reproduction traits were found within the range reported by other authors. However, somewhat higher heritabilities were found for litter size at birth – LSB (0.205) and litter size at weaning – LSW (0.250).    

Movement tactics of a mobile predator in a meta-ecosystem with fluctuating resources: the arctic fox in the High Arctic

Oikos ◽  
2016 ◽  
Vol 126 (7) ◽  
pp. 937-947 ◽  
Author(s):  
Sandra Lai ◽  
Joël Bêty ◽  
Dominique Berteaux
Keyword(s):  
High Arctic ◽  
The Arctic ◽  
Arctic Fox ◽  
Fluctuating Resources

The arctic fox in fennoscandia and Iceland: Management problems

1989 ◽  
Vol 49 (1) ◽  
pp. 67-81 ◽  
Author(s):  
Páll Hersteinsson ◽  
Anders Angerbjörn ◽  
Karl Frafjord ◽  
Asko Kaikusalo
Keyword(s):  
The Arctic ◽  
Arctic Fox ◽  
Management Problems

Accumulation and potential health effects of organohalogenated compounds in the arctic fox (Vulpes lagopus)—a review

2015 ◽  
Vol 502 ◽  
pp. 510-516 ◽  
Author(s):  
Kathrine Eggers Pedersen ◽  
Bjarne Styrishave ◽  
Christian Sonne ◽  
Rune Dietz ◽  
Bjørn Munro Jenssen
Keyword(s):  
Health Effects ◽  
The Arctic ◽  
Arctic Fox ◽  
Vulpes Lagopus ◽  
Potential Health

Dental evidence for variation in diet over time and space in the Arctic fox, Vulpes lagopus

Polar Biology ◽  
2021 ◽  
Author(s):  
Peter S. Ungar ◽  
Blaire Van Valkenburgh ◽  
Alexandria S. Peterson ◽  
Aleksandr A. Sokolov ◽  
Natalia A. Sokolova ◽  
...  
Keyword(s):  
The Arctic ◽  
Arctic Fox ◽  
Vulpes Lagopus ◽  
Time And Space ◽  
Dental Evidence ◽  
Over Time

scholarly journals Breeding value evaluation in Polish fur animals: Statistical description of fur coat and reproduction traits – relationship and inbreeding

2011 ◽  
Vol 49 (No. 1) ◽  
pp. 16-27 ◽  
Author(s):  
H. Wierzbicki ◽  
A. Filistowicz ◽  
W. Jagusiak
Keyword(s):  
Fixed Effects ◽  
Breeding Value ◽  
The Arctic ◽  
Arctic Fox ◽  
Data Sets ◽  
Value Evaluation ◽  
Inbreeding Coefficients ◽  
Silver Fox ◽  
Reproduction Traits ◽  
As Relationship

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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