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A Single Discarded Fishing Net Can Keep Killing for Centuries
By Jason Bittel
Divers off the coast of the Cayman Islands last month came face to face with a ghoulish sight: a gigantic mass of abandoned fishing gear and its catch. The monstrous net, as wide and deep as the Hollywood sign is tall, drifted just below the water's surface with tendrils that teemed with hundreds of dead and dying fish and sharks.
The divers attempted to cut some of the trapped souls from the tangled mess of netting and buoys, but most of them were already lost. Many more had been dead for so long, the divers said, that it was impossible to tell what species they were. The men tried to haul the massive net back to shore but said it was much too heavy for their boat to tow. So this marine blob is still out there.
It's not alone. In fact, this knot of ruin is completely unremarkable in the context of the global "ghost gear" crisis. A new report from the international nonprofit World Animal Protection (WAP) estimates that at least 700,000 tons of new ghost gear enter the sea each year. Once it's there, the flotsam can harm all kinds of sea life, including turtles, penguins, sea lions, dolphins, whales and diving shorebirds. The report found that 45 percent of all the marine mammals listed on the International Union for Conservation of Nature's Red List of Threatened Species have been killed or harmed by abandoned fishing gear.
"It's not shocking to me," said Charles Grisafi, the Florida and Caribbean regional coordinator for the NOAA Marine Debris Program. "These nets are huge. You can see gill nets out there over two miles long."
Two. Miles. Long.
Ocean plastic has garnered lots of attention in recent years (as it should), but fishing gear makes up a huge chunk of that problematic plastic. Unlike plastic bottles, drinking straws and grocery bags, this gear was designed for one purpose: catching and killing sea life. And it continues to do so long after the anglers who deployed it return to shore.
Ghost gear masses like the Caribbean discovery are essentially giant fish traps that perpetually re-bait themselves. The trapped animals attract predators and scavengers who then become ensnared themselves. After death, their rotting carcasses draw in still more victims and the cycle goes on and on, basically forever.
This is not hyperbole. The plastics that make up most of the nets in the oceans today take around 600 years to break apart. One old gill net found wedged between rocks off the coast of the San Juan Islands reportedly sat atop a pile of marine bird and mammal bones that was three feet deep.
For larger animals like whales, entanglements don't always bring a quick death. They instead confer a life sentence of towing around a heavy aquatic ball and chain, the health effects of which scientists are only beginning to understand. (Spoiler alert: It ain't good.) And as with other ocean pollution, some animals eat ghost gear, as evidenced by necropsies of 22 sperm whales stranded in the North Sea. Of all the nonfood items in their guts, 78 percent was fishing gear, including, in one case, a plastic fishing net that was more than 42 feet long.
Forty-two. Feet. Long.
There are numerous paths by which this waste winds up in the water, said Elizabeth Hogan, WAP's U.S. oceans and wildlife campaign manager. Gear can malfunction and detach, nets can get stuck on reefs or other objects and never resurface, and, yes, some fishermen simply discard nets and traps out of convenience or as a way to cover their tracks when they're fishing illegally. The largest contributor to ghost gear, though, is the weather. "I would say [that's] the primary reason for gear loss," says Hogan, "and who can argue with bad weather?"
World Animal Protection's Elizabeth Hogan on a beach survey and cleanup in Hawaii.World Animal Protection / Rachel Ceretto
It's not as if most fishermen want to lose their gear, after all. When a series of storms ravaged the British Isles in the winter of 2013–2014, some crab fishermen lost upwards of $35,000 worth of gear when conditions forced them to abandon their strings of pots.
Whatever the excuse, something needs to be done about it—and this is where Grisafi and Hogan share some optimism. As tagging gear with GPS devices becomes easier and more affordable, Hogan said it will help enormously in the fight against new ghost gear. Similarly, Grisafi points to technology advancements that can help make gear less lethal once it's lost. These include making fishing nets more biodegradable in general or incorporating biodegradable panels into traps so they no longer continue to catch and kill ad infinitum. Simple tweaks to existing gear, such as adding cull-rings that allow smaller crabs to escape a pot, can also make a big difference.
But there are still miles and miles of drifting killers out there. The NOAA Marine Debris Program finances removal projects so big, they run in the hundreds of thousands of dollars. Projects range from collecting derelict crab pots in the waters off New Jersey to floating traps that catch litter on Maryland's Anacostia River to removing an 83-foot shipwreck off the Northern Mariana Islands that's damaging coral habitat.
"We're just getting started, honestly," Grisafi said.
That's why his outlook is positive. Because we've only just begun to address this problem, the only way to go is up.
Reposted with permission from our media associate onEarth.
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Farms with just one or a handful of different crops encourage fewer species of pollinating and pest-controlling insects to linger, ultimately winnowing away crop yields, according to a new study.
Up to half of the detrimental impacts of the "landscape simplification" that monocropping entails come as a result of a diminished mix of ecosystem service-providing insects, a team of scientists reported Oct. 16 in the journal Science Advances.
Monocrop palm oil plantation Honduras.
SHARE Foundation / Flickr / CC BY-NC 2.0
"Our study shows that biodiversity is essential to ensure the provision of ecosystem services and to maintain a high and stable agricultural production," Matteo Dainese, the study's lead author and a biologist at Eurac Research in Bolzano, Italy, said in a statement.
It stands to reason that, with declines in the sheer numbers of insects that ferry pollen from plant to plant and keep crop-eating pests under control, these services will wane as well. But until now, it hasn't been clear how monocultures affect the number and mix of these species or how crop yields might change as a result.
Aiming to solve these questions, Dainese and his colleagues pulled together data from 89 studies cutting across a variety of landscapes, from the tropics of Asia and Africa to the higher latitudes of northern Europe. They tabulated the number of pollinating and pest-controlling insects at these sites — both the absolute number of individuals and the number of species — along with an assessment of the ecosystem services the insects provided.
In almost all of the studies they looked at, the team found that a more diverse pool of these species translated into more pollination and greater pest control. They also showed that simplified landscapes supported fewer species of service-providing insects, which ultimately led to lower crop yields.
The researchers also looked at a third measure of the makeup of insect populations — what they called "evenness." In natural ecosystems, a handful of dominant species with many more individuals typically live alongside a higher number of rarer species. The team found as landscapes became less diverse, dominant species numbers dwindled and rare species gained ground. This resulting, more equitable mix led to less pollination (though it didn't end up affecting pest control).
"Our study provides strong empirical support for the potential benefits of new pathways to sustainable agriculture that aim to reconcile the protection of biodiversity and the production of food for increasing human populations," Ingolf Steffan-Dewenter, one of the study's authors and an animal ecologist at the University of Würzburg in Germany, said in the statement.
The scientists figure that the richness of pollinator species explains around a third of the harmful impacts of less diverse landscapes, while the richness of pest-controlling species accounts for about half of the same measure. In their view, the results of their research point to the need to protect biodiversity on and around crops in an uncertain future.
"Under future conditions with ongoing global change and more frequent extreme climate events, the value of farmland biodiversity ensuring resilience against environmental disturbances will become even more important," Steffan-Dewenter said.
Reposted with permission from our media associate Mongabay.
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