Scientists measure climate impact on Wiltshire salmon

Four temperature monitors have been installed along a stretch of the River Wylye at the Langford Lakes nature reserve, near Salisbury.

Scientists from Wiltshire Wildlife Trust will take readings every 15 minutes, helping them to analyse any benefits cooler water has in encouraging more salmon to swim upstream and spawn.

Langford Lakes warden Chris Riley said that three years ago there were five spots where the salmon lay their eggs in the gravel, but last winter there were none.

"If this continues, the salmon could be extinct in Wiltshire in just three years," he told BBC News.