Deep sea creatures living off the Outer Hebrides have been feeding on plastic for at least four decades, researchers have discovered

Scientists examined archived specimens of animals collected more than 2,000m (6,561.8ft) down in the Rockall Trough off the Western Isles.

Traces of eight different plastics were found in the stomachs of starfish, sea stars and brittle stars which were collected between 1976 and 2015.

Polyester and nylon were among the plastics identified by the researchers at the Scottish Association for Marine Science (SAMS) in Oban, suggesting they may have come from the washing of synthetic clothes.

It follows research last year that suggested 48 per cent of sampled starfish and snails from the Rockall Trough had eaten microscopic pieces of plastic.

"Mass production of plastics only began in the 1940s and 1950s, so it would be reasonable to expect less plastic in our earlier samples, with a subsequent upward trend to the present-day levels," said lead author Winnie Courtene-Jones, a doctoral student at the University of the Highlands and Islands and SAMS.

"But we haven't seen that. In fact, the level of microplastic ingestion is remarkably similar throughout the time series.

"This data shows, for the first time, the long-term prevalence of microplastic pollution in the deep sea and indicated that microplastics may have been present on the sea floor of the Rockall Trough prior to 1976."