https://marinescience.blog.gov.uk/2019/09/02/research-expedition-visits-plastic-pollution-hotspot/

Research expedition visits plastic pollution hotspot

assorted rubbish on a beach

More than 2 years after Henderson Island was found to have the 'world's highest’ recorded density of plastic rubbish scientists returned for another research expedition.

Last June the team used a variety of equipment from underwater cameras to sand corers to collect information on plastic pollution and biodiversity. Over 11 days the team captured over 4,000 images of the seabed, collected six tonnes of rubbish and undertook many different experiments on the impact of the plastic waste on the beach and surrounding area.

2 people on a boat lowering a camera underwater
Blue Belt’s Simeon Archer-Rand from Cefas lowering the deep-water camera to collect images of the seabed floor. Image credit: Luke Hosty.

The Blue Belt Programme provided financial support and scientific expertise to the Henderson Expedition. Blue Belt’s Simeon Archer Rand from Cefas was one of the team on the two-week expedition.

a group of people on beach
The expedition team included scientists, journalists, film makers, artists and a clean-up-team. Image credit: Luke Hosty.

After landing in Tahiti it took the group nearly a week to reach the uninhibited island, which lies more than 4,500 km from the nearest continent. Despite its remote location millions of pieces of plastic are deposited on this island due to ocean currents.

rubbish on a beach
The team collected 1,200 fishing buoys and a range of larger, rigid plastics from water bottles to toilet seats. Image credit: Luke Hosty.

“We collected over six tonnes of waste from just over 2 km of beach including everything from fishing buoys and rope to toy soldiers. But the beach will not stay that way for very long due to ocean currents, so we’ve deployed cameras to track the return of litter” says Robin Shackell, Deputy Governor of Pitcairn and Henderson Expedition lead.

“We’re planning to take the waste from the beach clean to Costa Rica where it will be re-used within building materials such as building blocks ” explains Robin.

a man on a boat on a computer
Simeon viewing the footage from the underwater cameras. Image credit: Luke Hosty.

Studying plastic pollution was just one focus of the research expedition. Henderson Island is in the UK government’s Blue Belt Programme which aims to protect over 4 million square kilometres of ocean by 2020.

“We saw some of the deepest and most extensive reefs I’ve ever seen. I collected over 4,000 underwater videos and photos around the island and used echo sounder data to map the sea floor” says Cefas’ Simeon Archer-Rand, Blue Belt Programme scientist.

This information will be analysed and fed into marine management plans to help protect Henderson Island’s precious marine environment.

coral reefs
Henderson Island is surround by a coral reef. Image credit: Luke Hosty.

The footage will also be used to study the levels of litter on the seabed, feeding into a litter movement model to track how the litter might have moved on the tides and its effect on marine life.

“Its not just the litter you can see that’s an issue – its micro and nano-plastics” adds Simeon. “We collected sand samples from 24 different locations around the island.  Back in the Cefas lab we’ll stain these samples with a solution so we can count and sort the microplastics under UV light” explains Simeon.

someone's hand with small bits of plastic
Sand samples were collected for microplastics analysis. Image credit: Luke Hosty.

Marine litter is one of the most pressing issues facing the ocean: from the deepest areas of the sea, to the remote Arctic Ocean, marine litter does not follow international borders. Global cooperation is necessary to tackle this problem, particularly in states and territories which contribute relatively little to the problem, yet can be proportionally major recipients of marine litter.

 The Blue Belt Programme supports the delivery of the UK government’s commitment to enhance marine protection for over four million square kilometres of marine environment across the UK Overseas Territories (UKOTs). It is delivered by Cefas and the MMO. To find out more on the Blue Belt programme

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