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1

Considering sampling approaches when determining carnivore diets: the importance of where, how, and when scats are collected

100%
Steenweg R., Gillingham M. P., Parker K. I., Heard D. C.
Acta Theriologica
|
2015
|
tom 60
|
nr 3
2

Seasonal diets of red foxes in a boreal forest with a dense population of moose: the importance of winter scavenging

67%
Needham R., Odden M., Lundstadsveen S. K., Wegge P.
Acta Theriologica
|
2014
|
tom 59
|
nr 3
In Scandinavia, an increased red fox Vulpes vulpes density during the last decades has been suggested to be caused by direct and indirect human influences on food availability. Recently, attention has been focused on the role of increasing scavenging opportunities due to intensified hunting of ungulates and the reestablishment of large carnivores. In our study, we investigated seasonal and annual variations in diet composition of red fox in Varaldskogen, SE Norway, an area with cyclic voles and a high density of moose Alces alces. Analyses of scats revealed significant differences among seasons in the occurrence of ungulates—mainly moose—and ungulates were the dominating food category during winter (44.9 % of all remains). Snow tracking of red fox (71 km) in winter confirmed the importance of ungulate carcasses, i.e. one case of scavenging per 3 km. The proportions of voles were high during all seasons (11.2–28.8 %); in spite of variation in available abundances, no significant seasonal or annual differences were detected. Other food categories with seasonal variation were birds, berries/seeds and amphibians/reptiles, all more common in snow-free seasons. Our study underlines the importance of ungulate remains during periods when the abundance and diversity of alternative food sources is low. Increased and stabilized populations of red foxes—mediated through remains from hunting and wolf kills from high moose populations—might have an important effect on the population dynamics of small game. Hence, we recommend that this relationship be given attention in future studies.
3

Foraging ecology and spatial behaviour of the red fox (Vulpes vulpes) in a wet grassland ecosystem

67%
Meisner K., Sunde P., Clausen K. K., Clausen P., Faelled C. C., Hoelgaard M.
Acta Theriologica
|
2014
|
tom 59
|
nr 3
We investigated diet composition, habitat selection and spatial behaviour of the red fox (Vulpes vulpes) in relation to the availability of wader nests in a coastal polder area in southwest Denmark. The predatory role of the red fox in wet grassland ecosystems has profound implications for conservation status of declining populations of grassland breeding waders. However, few studies have focussed on the foraging ecology and behaviour of the red fox in these landscapes. Faecal analyses revealed that fox diet consisted of birds (43 % of prey remains / 32 % of biomass), rodents (39 % / 21 %), sheep (mainly as carrion, 14 % / 41 %) and lagomorphs (4 % / 7 %). Charadriiformes (including waders) comprised 3–12 % of prey remains throughout the year. Telemetry data and spotlight counts indicated that foxes did not select areas with high densities of breeding waders, suggesting that foxes did not target wader nests while foraging. Foxes maintained stable home ranges throughout their lives, indicating that the area sustained a permanent fox population all year round. The population densities, estimated from spotlight surveys, were 0.74 visible foxes km−2 (95 % CI; 0.34–1.61) on the preferred breeding habitat for waders and 1.21 km−2 in other open habitats such as cultivated fields. Our results indicate that red fox predation on wader nests is incidental, consistent with the notion that red foxes are generalist predators that opportunistically subsist on many prey groups.
4

Two models for assessing the prey mass of European ungulates from wolf scats

67%
Ruehe F., Buschmann I., Wameling A.
Acta Theriologica
|
2003
|
tom 48
|
nr 4
Among the prey of wolf Canis lupus Linnaeus, 1758, in many European regions, roe deer Capreolus capreolus, red deer Cervus elaphus and wild boar Sus scrofa are of primary significance. Up to now, these species were not represented in models which allow an estimation of the consumed biomass on the basis of wolf scats. To develop such formulae for roe deer, red deer and wild boar, we fed these species to 5 captive adult wolves of European origin. In 10 feeding trials, the wolves were fed 10 prey, whose body mass ranged from 15.3 to 118.5 kg. We related the body mass of the prey in accordance with Weaver (1993) to one collectable scat (Model l: y = 0.00554 + 0.00457«) and, as it is difficult to define one unit scat, we alternatively related it to one meter length of scats (Model 2: y = 0.141 + 0.0487«). The Model 1 equation differed from both of Weaver's (1993) regressions, which he had calculated on the basis of his own feeding trials and on the basis of the summarised data of Floyd et al. (1978), Traves (1983) and Weaver (1993). Applying an equation gained through the European ungulates resulted in lower estimates of prey mass. Model 1 and Model 2 estimates were comparable in size.
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