Foxes & agriculture: Agricultural benefits
Rabbits are one of the main agricultural pests in Britain. In the mid-1980s, damage by rabbits caused an estimated loss of £120 million, compared to badgers, causing losses of up to £60 million, and brown rats and house mice together, caused losses of up to £30 million.
Foxes caused about £12 million of losses but this needs to be put in perspective by considering that rabbits are the main prey of foxes in rural areas. By eating rabbits, the adult fox population provides an indirect economic benefit to farmers of at least £7 million annually (using a conservative estimate). Because fox benefits to agriculture largely offset their costs, foxes are probably economically neutral to farmers.
A few numbers
Rabbits cause most agricultural losses but farmers tend to underestimate their losses due to rabbit grazing. At 1998 prices, one study estimated that, each year, a single rabbit would cost a farmer £6.50 eating winter wheat, £1.40 eating spring barley and £3.40 eating grazing pasture.
In rural areas of Britain, 45% to 70% of the diet of foxes is made up by rabbits. During its lifetime, by eating rabbits each fox might be worth £150-£900 in increased revenue to farmers.
In areas with high levels of predator control, where fox density is lower, rabbit density is higher and there seems to a negative link between predator control and rabbit abundance, i.e. rabbits seem to thrive where there are fewer foxes.
Forestry and foxes
At high densities, field voles can cause serious damage to young commercial trees. Field voles are commonly eaten by foxes so that foxes, together with other predators, probably have a significant impact on field voles numbers.
One study estimated that the number of field voles in Britain was only just adequate to support existing predator populations, and that four predators - fox, kestrel, weasel and feral cat - accounted for more 85% of the estimated consumption of field voles. Thus, although there are no studies into the benefits of foxes to forestry, it is probable that foxes are helping reduce economic losses to forestry. In commercial forests, foxes are most common in young plantations where populations of field voles and rabbits are highest and where most damage occurs.
Find out more (link to external websites):
- about the role of voles in upland areas Natural Environment Research Council
- how voles can cause damage Scottish Agricultural College or The Forestry Commission
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