The INDICIT team based in the Azores archipelago (Portugal) recently published a study on the ingestion of marine debris by loggerhead turtles off the North Atlantic subtropical gyre.
This study, focusing on oceanic-stage loggerheads showed that 83% of those pelagic juveniles had ingested debris (mostly plastic), including large microplastics (1-5mm).

The most frequent items were plastic fragments followed by the remains of plastic sheets, foam and fishing-related plastic as synthetic ropes and fishing lines. The results of this study demonstrate that plastic pollution acts as another stressor for this vulnerable life stage of loggerhead turtles in the North Atlantic.

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http://www.sciencedirect.com/science/article/pii/S0025326X17304885