Spatial and temporal trends and effects of population size on the frequency of color phenotypes in the wild red fox (Vulpes vulpes)

We analyzed the hypothesized relationships of temporal, spatial, and harvest trends with frequency of red fox (Vulpes vulpes) color morphs in 57 Hudson's Bay Company posts over a 20- to 26-year period, but found none of the strong relationships postulated to exist. A meta-analysis of each data set suggested a weak inverse relationship between latitude and frequency of the red morph. Meta-analysis further indicated a weak positive relationship with time and the frequency of the red phase, although this trend was not due to climate change. No relationship was found between harvest size and color phase, or between a 1-year lagged harvest size and color phase, which evaluated the effects of dispersal. The data sets did not allow conclusive determination of the mechanisms behind the trends, but it is postulated that a slight selective advantage is found for the dark morphs at high latitudes, while the temporal increase in frequency of the red phenotype is probably the result of northward dispersal from southern populations.

[1]  M. Bulmer.  Phase Relations in the Ten-Year Cycle , 1975 .

[2]  S. Harris,et al.  Dispersal distance, home-range size and population density in the red fox (Vulpes vulpes): a quantitative analysis , 1988 .

[3]  L. Butler.  The genetics of the colour phases of the red fox in the Mackenzie River locality. , 1947, Canadian journal of research.

[4]  Tim Gerrodette,et al.  A POWER ANALYSIS FOR DETECTING TRENDS , 1987 .

[5]  I. M. Cowan.  Geographic Distribution of Color Phases of the Red Fox and Black Bear in the Pacific Northwest , 1938 .

[6]  J. T. Major,et al.  Interspecific relationships of coyotes, bobcats, and red foxes in western Maine , 1987 .

[7]  S. Harris.  AN ESTIMATION OF THE NUMBER OF FOXES (VULPES VULPES) IN THE CITY OF BRISTOL, AND SOME POSSIBLE FACTORS AFFECTING THEIR DISTRIBUTION , 1981 .

[8]  O. Lohi,et al.  Beautiful fur animals and their colour genetics , 1988 .

[9]  V. K. Prest,et al.  Paleogeography of northern North America , 1987 .

[10]  V. K. Prest,et al.  Paleogeography of northern North America, 18 000 - 5 000 years ago , 1987 .

[11]  L. Butler.  Distribution and Genetics of the Color Phases of the Red Fox in Canada. , 1945, Genetics.

[12]  A. Sargeant,et al.  Dispersal patterns of red foxes relative to population density , 1993 .

[13]  J. Endler.  Gene Flow and Population Differentiation , 1973, Science.

[14]  A. Macpherson.  The Origin of Diversity in Mammals of the Canadian Arctic Tundra , 1965 .

[15]  L. Butler.  THE NATURE OF CYCLES IN POPULATIONS OF CANADIAN MAMMALS , 1953 .

[16]  J. E. Chalifour,et al.  Atlas of Canada , 1909, Nature.

[17]  R. Arditi.  Avoiding fallacious significance tests in stepwise regression: a Monte Carlo method applied to a meteorological theory for the Canadian lynx cycle , 1989 .

[18]  E. Cross.  Colour Phases of the Red Fox (Vulpes Fulva) in Ontario , 1941 .

[19]  L. Keith,et al.  Wildlife's ten-year cycle , 1963 .

[20]  Eduardo Fernandez-Duque,et al.  Meta‐Analysis: A Valuable Tool in Conservation Research , 1994 .

[21]  S. Payette,et al.  Secular climate change in old-growth tree-line vegetation of northern Quebec , 1985, Nature.

[22]  Michael E. Gilpin,et al.  Do Hares Eat Lynx? , 1973, The American Naturalist.

[23]  W. B. Davis.  Voles, mice and lemmings , 1942 .

[24]  P. A. P. Moran,et al.  The statistical analysis of the Canadian Lynx cycle. , 1953 .

[25]  P. Hersteinsson,et al.  Interspecific competition and the geographical distribution of red and arctic foxes Vulpes vulpes and Alopex lagopus , 1992 .

[26]  J. Finerty,et al.  Cycles in Canadian Lynx , 1979, The American Naturalist.

[27]  H. C. Wallace.  United States Department Of Agriculture Yearbook , 1925 .

[28]  L. Hedges,et al.  Statistical Methods for Meta-Analysis , 1987 .

[29]  A. Cockburn.  The Population Ecology of Cycles in Small Mammals: Mathematical Theory and Biological Fact , 1980 .

[30]  Charles C. Elton,et al.  Voles, Mice and Lemmings: Problems in Population Dynamics , 1942 .

[31]  R. Harris.  Reliability of trend lines obtained from variable counts , 1986 .

[32]  Jessica Gurevitch,et al.  A Meta-Analysis of Competition in Field Experiments , 1992, The American Naturalist.

[33]  P. Moran.  The Statistical Analsis of the Canadian Lynx cycle. 1. Structure and Prediction. , 1953 .

[34]  A. Macpherson.  A Northward Range Extension of the Red Fox in the Eastern Canadian Arctic , 1964 .

[35]  P. Hersteinsson,et al.  Inheritance models of North American red fox coat color , 1993 .

[36]  S. Adalsteinsson,et al.  Fox colors in relation to colors in mice and sheep. , 1987, The Journal of heredity.

[37]  J. Haldane.  The selective elimination of silver foxes in Eastern Canada , 1942 .

[38]  U. Usa,et al.  Yearbook of agriculture. , 1936 .

[39]  M. G. Bulmer,et al.  A Statistical Analysis of the 10-Year Cycle in Canada , 1974 .