Marine Debris–A Growing Planetary Threat


otter in plastic bag

Editor’s Note:  Both opinion pieces noted here, follow the main story, in their entirety.

One of the major growing threats, to both humans and wildlife, is marine debris. The amount of waste and especially plastic waste in our oceans is unprecedented and our wildlife is suffering as a result. Whales, dolphins, birds and turtles are all being found with stomachs full of plastic – in 2013 a sperm whale that washed up on the south coast of Spain was found to have consumed over 17kg of plastic waste, including several plastic bags, a clothes hanger, an ice-cream tub and nine metres of rope. In addition to plastic, more and more animals are being found entangled in discarded or lost fishing gear. For most this will likely involve a subsequently slow, painful and lingering death.

Two opinion pieces that discuss marine debris in some depth and that are well worth a read on this auspicious day come from …

Bradnee Chambers, Executive Secretary of the Convention on the Conservation of Migratory Species of Wild Animals. Mr Chambers discusses the impact of the growing problem of marine debris on islands’ wildlife and the economic and environmental consequences.  (See full article below.)

And …

Dr. Wendy Watson-Wright, Executive Secretary of UNESCO ‘s Intergovernmental Oceanographic Commission (IOC) talks about the consequences of these vast quantities of trash bobbing around the ocean, both for humans and wildlife, and points to what she regards as the only way to solve the problem.

The problem is not going to go away without some serious engagement on behalf of society and Governments – on this World Environment Day 2014 why not try to do your bit?

From WDC

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By Brandee Chambers, Inter Press Service

C. Coimbra Photo

C. Coimbra Photo

BONN, May 21 2014 (IPS) – Some of the Earth’s most delicate tropical paradises are being disfigured by the by-products of the modern age – marine debris: plastic bottles, carrier bags and discarded fishing gear.

Just a tiny fraction of this originates from the islands themselves – most is generated on land and enters the sea through the sewers and drains; the rest comes from passenger liners, freighters and fishing vessels, whose crews often use the oceans as a giant waste disposal unit. While much of the garbage sinks, some of it joins the giant gyres where the currents carry it across the globe.

Small Island Developing States (SIDS), recognised as a distinct group of nations by the UN Conference on Environment and Development in 1992, lack the space to dedicate to landfill sites and do not have the resources to deal with the huge problem of marine debris that is being washed up on their doorstep – as the tides and currents wash the accumulated marine garbage onto their beaches. Domestically, they can take steps to ensure that they do not add to the problem – American Samoa for instance has banned plastic bags – but the “polluter pays” principle would require that those responsible for producing the waste should be made responsible for disposing of it properly.

Palau has banned commercial fisheries in its huge territorial waters forsaking the lucrative licensing revenue and will develop ecotourism based on snorkelling and scuba diving as a sustainable alternative. Alive, Palau’s sharks can bring in $1.9 million each over their life-time. Dead, a shark is worth a few hundred dollars, most of it attributable to the fins used to make soup considered a delicacy in parts of East Asia.

In February, Indonesia became the world’s largest sanctuary for manta rays and banned the fishing and export of the species throughout the 2.2 million square miles surrounding the archipelago. The numbers are about the same; as a tourist attraction, a manta ray is worth in excess of 1 million dollars; as meat or medicine no more than 500 dollars.

Whale-watching creates jobs while bird-watching boosts binocular and camera sales and both help hotel occupancy rates. And the total number of international travellers broke the one billion mark for the first time in 2012 making tourism one of the main foreign exchange earners globally particularly for many developing countries, including SIDS.

But marine debris casts its ominous shadow and threatens to break the virtuous circle which would otherwise guarantee sustainable livelihoods and incentives to protect wildlife.

Sea birds inadvertently feed their young with plastic which then blocks the chicks’ intestines preventing them from eating properly and leading to a slow and painful death. The staple prey of some marine turtles is jellyfish but the turtles often mistake plastic bags for their favourite food with same dire results. For larger species such as whales, dolphins and seals, discarded fishing gear – ghost nets – are a problem as the animals become entangled in them. This can impede the animals’ movement and ability to hunt as well as cause serious injury or even death through drowning.

Remote island habitats support a rich and diverse fauna often including unique endemic species and provide vital stop-over sites for migrants and breeding sites for marine birds. But long established bird colonies have fallen victim to another danger exacerbated by humans – that posed by invasive alien species.

The problem of rodent infestations is well documented. Mice and rats have escaped from ships wreaking havoc on the local bird populations which had previously nested on the ground with impunity as there were no predators. Eradication programmes have successfully rid 400 islands of their alien rodents.

Less well known is the phenomenon of “rafting” where the invaders also use marine debris as a vector – plastic bottles are harbouring a potentially devastating assortment of worms, insect larvae, barnacles and bacteria, and warmer waters arising from climate change increase the resilience of these unwanted stowaways making them an even more potent danger.

One of the fascinations of dealing with the animals covered by the Convention on Migratory Species is how they link different countries and even continents. Many of the species are endangered and their conservation as well as the threats that they face require internationally coordinated measures. This applies to marine debris, a singularly unwelcome “migratory species” whose continued presence CMS will be doing its utmost to eliminate.

 

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From Deutsche Welle

The fate of Malaysia Airlines Flight MH370 has been shrouded in mystery ever since it left Kuala Lumpur for Beijing in the early morning hours of March 8 with 239 people on board. While the Boeing 777 is believed to have crashed in the southern Indian Ocean, search efforts have repeatedly been hampered by objects spotted by radar, ships and airplanes that have turned out to be garbage, leading to growing frustration among the victims’ relatives and search crews.

But the false sightings have put the spotlight on the wider garbage problem affecting the world’s oceans. In a DW interview

C. Coimbra Photo

C. Coimbra Photo

to mark World Environment Day on June 5, Dr. Wendy Watson-Wright, Executive Secretary of UNESCO’s Intergovernmental Oceanographic Commission (IOC) talks about the consequences of these vast quantities of trash bobbing around the ocean, both for humans and wildlife, and points to what she regards as the only way to solve the problem.

DW: How serious is the marine garbage problem in the Pacific Ocean?

Dr. Wendy Watson-Wright: The problem is very serious, but not quite as graphically enticing as most commentators out there would have us think. The name “Pacific Garbage Patch” is slightly misleading, as it leads you to think of a large and continuous patch of litter – a literal island of trash that one might be able to see on aerial photos or even from space.

The truth is less appealing, unfortunately. I say unfortunately not because an “island of trash” would be a better alternative to the “soup” of small pieces of floating plastic that comprises most of the “garbage patch,” but because a solid, floating island of visible trash might be more straightforward to clean.

The truth is that the debris that accumulates in the ocean is continuously mixed by wind and wave action and widely dispersed over huge surface areas and throughout the top portion of the water column. It is possible to sail through the “garbage patch” area and see very little or no debris on the water’s surface.

It is also difficult to estimate the size of these “patches” because the borders and content depend on ocean currents and winds. In the end, we are left with few certainties in regards to the size and mass of these concentrations of debris, but one thing is for sure: large portions of man-made debris in the ocean can never be a harbinger of good news.

To your knowledge, how has the large amount of garbage in the ocean affected the search for missing Malaysian airplane MH370?

The large amount of garbage has surely generated some false hopes as the satellites keep spotting large, but unrelated pieces of debris, fishing equipment, and other flotsam. If anything positive can be said to have come out of this terrible incident, let us hope that it will be a renewed attention on the part of the general public, the press, and decision-makers to the awful amounts of man-made debris dumped everyday in the ocean.

What is the most abundant type of garbage found in the ocean?

One of the main types of marine debris that you hear about today is plastic marine debris. In many places, it is the main type of debris that you will see as you walk along a beach, though perhaps not underwater. As society has developed new uses for plastics, the variety and quantity of plastic items found in the marine environment has increased substantially.

From common household materials to industrial products, to lost or abandoned fishing gear, all of these plastic materials increasingly find their way to the ocean and contribute to a problem that will catch up with humankind sooner than later.

The other reason for why plastic is the most abundant type of garbage in the ocean has to do with its degradation rate.

Plastics do degrade in the ocean, but there are many different types, each with a specific chemical composition and degradation rate. Research tells us that the most common types of plastics have such slow degradation rates that they never fully “go away,” and instead break down into ever-smaller pieces.

To what extent are other oceans also facing a garbage problem?

The “patches” of the Great Pacific Garbage Patch are not the only open ocean areas where marine debris is concentrated. Another important area is the North Pacific, in the Subtropical Convergence Zone (STCZ). This area, located north of the Hawaiian archipelago, has a high abundance of marine life, but is also known for marine debris concentration. That said, whether the garbage is in the Pacific or the Atlantic, it matters very little. To a greater or lesser extent, the problem affects the ocean in its entirety.

What impact is this huge amount of garbage having on marine biology?

The impacts are many, and quite severe. Abandoned nets, plastic tarps, fishing gear and other debris can smother and crush sensitive ecosystems and their bottom-dwelling species. Fishing line, nets, rope and other debris can entangle and drown many wildlife species. Animals can also ingest debris, which can lead to starvation and/or choking.

Studies have shown that fish and other marine life do eat plastic, suffering from irritation, damage to the digestive system, and/or malnutrition or starvation as a result. Medical and personal hygiene debris are particularly threatening for marine biology, as they may contain harmful bacteria that will propagate in waterways.

How big a threat does the growing level of pollution in the ocean pose to people?

In terms of direct impacts, one can quickly think of the danger that syringes and broken glass pose to barefooted beachgoers. Grocery and trash bags, fishing line, nets, rope and other debris provide examples of threats to human life, as they can wrap around boat propellers and clog seawater intakes, causing costly damage and potentially turning into a safety hazard.

It is when speaking about the indirect impacts of marine pollution that we should be most alarmed, however. Plastic debris accumulates pollutants such as PCBs (polychlorinated biphenyls) up to 100,000 to 1,000,000 times the levels found in seawater. Banned in the US for some time now, PCBs could potentially make their way back into human life cycles everywhere via marine animals that have ingested plastic with high PCB levels. The negative impact on humans from consuming these infected animals is high and could result in severe poisoning.

What can be done to solve the problem?

The answer to this question is not as simple as one would think, as we can’t even talk about cleaning it all up. It is not cost-effective to skim the surface of the entire ocean, and even a cleanup focusing on “garbage patches” would be challenging and financially onerous.

Taking into consideration that debris concentration in “garbage patches” moves and changes constantly, that these are incredibly large areas, and waste particles are not distributed evenly within the “patches,” the whole question adds up to a huge challenge. That is without mentioning the fact that these areas of marine debris concentration may also be repositories for certain types of marine life, making a simple “skimming job” risky for marine biodiversity in those areas.

The only solution is to implement wise waste-disposal policies on land to make sure that plastic and other harmful materials go through appropriate waste management schemes and stay far clear of the ocean.

This may seem like a large task for governments at the local and national levels, but every citizen can do his or her part by responsibly disposing of trash, participating in local cleanups, reducing your waste and rethinking overall consumption patterns. Remember the 3 R’s: Reduce, Reuse, Recycle!

Dr. Wendy Watson-Wright is Executive Secretary of UNESCO’s Intergovernmental Oceanographic Commission (IOC) in Paris. The United Nations body for ocean science, ocean observatories, ocean data and information exchange, and ocean services such as Tsunami warning systems.
The interview was conducted by Gabriel Domínguez.

 



Categories: Coastal Clean-Up, Condition of Oceans, Entangled Marine Mammals, Entangled Sealife, Fisheries, Fishing Lines, Ghost Nets, Great Pacific Trash Island, International Coastal Clean-Up, Microplastics in Ocean, Plastic Pollution, Plastics and marine mammals, Plastisphere

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