Jefferies 1996-1998 study on water vole distribution in the UK shows a precipitous drop (88%) in water vole population since his previous study in 1989-90. He records that the estimated UK summer population of voles had declined from 7,294,000 to 875,000 in only eight years. He also records the loss of 69.62% of occupied sites in the same time period. Pressure from sheep grazing and feral mink predation were found to be the main reasons for this.
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