Far from being the pristine ‘deserted island’ that people might imagine of such a remote place, Henderson Island is a shocking but typical example of how plastic debris is affecting the environment on a global scale, say the researchers.
Despite being uninhabited and located more than 5000 kilometers from the nearest major population center, Henderson Island is littered with an estimated 37.7 million pieces of plastic.
Part of the UK’s Pitcairn Islands territory, the island is so remote that it’s only visited every five to ten years for research purposes, but its location near the center of the South Pacific Gyre ocean current makes it a focal point for debris carried from South America or deposited by fishing boats.
During the most recent scientific expedition to the island led by the IMAS researcher Dr. Jennifer Lavers, found the beaches littered with up to 671 items per square meter, the highest density ever recorded.
“What’s happened on Henderson Island shows there’s no escaping plastic pollution even in the most distant parts of our oceans,” Dr. Lavers said.
“Based on our sampling at five sites we estimated that more than 17 tons of plastic debris have been deposited on the island, with more than 3570 new pieces of litter washing up each day on one beach alone.
“It’s likely that our data actually underestimates the true amount of debris on Henderson Island as we were only able to sample pieces bigger than two millimeters down to a depth of 10 centimeters, and we were unable to sample along cliffs and rocky coastline.”
Dr. Lavers said most of the more than 300 million tons of plastic produced worldwide each year are not recycled, and as it’s buoyant and durable it has a long-term impact on the ocean.
“Plastic debris is an entanglement and ingestion hazard for many species. It creates a physical barrier on beaches to animals such as sea turtles and lowers the diversity of shoreline invertebrates.
Dr. Lavers said that more than 200 species are known to be at risk from eating plastic, and 55 percent of the world’s seabirds, including two species found on Henderson Island, are at risk from marine debris.