The British water vole (Arvicola terrestris) population declined throughout the 20th century due to habitat destruction and change with intensification of agriculture. This decline has accelerated in recent years due to predation by feral American mink.
Two national surveys carried out by the VWT in 1989-90 and 1996-1998 have shown that this decline has now developed into a serious population 'crash' with a further loss of 67.5% of the occupied sites and 88% of the remaining population in only seven years. This population loss has been most severe in the north and south-west of England, reaching over 97% of the population in Yorkshire.
Please go our publications page for details of the 1996-1998 Water Vole and Mink Survey Report.