Common dolphins were once rare in the Hebrides , preferring warmer water . But their numbers have declined by 80 per cent over the last 100 years . scientists believe this may be due to the waters warming by 0.5 ° ##c . Hebridean fisheries and Dolphin Trust is recruiting scientists for monitoring .
Common dolphins were once rare in the Hebrides , preferring warmer water . But their numbers have risen by 68 per cent over the last 12 years . Scientists believe this could be due to the waters warming by 0.5°C . Hebridean Whale and Dolphin Trust is recruiting volunteers for monitoring .