Field vole population cycles drive the welfare of a cascade of predator species, creating boom-bust welfare dynamics that affect everything from kestrels to short-eared owls.
Vole population dynamics create some of the most dramatic welfare fluctuations in UK wildlife, with effects cascading through multiple predator species. In peak vole years, barn owls, kestrels, short-eared owls, weasels, stoats, and foxes all benefit from prey abundance: individual predators have better body condition, higher reproductive success, and experience less foraging stress. Individual voles, by contrast, experience increased predation pressure during population peaks, though individual voles that survive the peak have access to abundant vegetation. In vole crash years, predator welfare deteriorates rapidly: barn owls may abandon breeding attempts, kestrels fail to raise full broods, and stoat populations crash within the same season. The welfare of these predator species is thus determined partly by ecological dynamics that operate at landscape scale and over multi-year timescales. Human land management decisions that affect vole habitat quality - particularly the management of rough grassland including traditional hay meadows, road verges, and field margins - have cascading welfare effects on the entire predator community. Maintaining diverse grassland management regimes that support vole populations through boom and bust cycles is among the most welfare-effective wildlife management interventions available.