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This Map Shows How Your Consumption Habits Impact Wildlife Thousands of Miles Away

Animals
This Map Shows How Your Consumption Habits Impact Wildlife Thousands of Miles Away

By Shreya Dasgupta

Global trade has made it easier to buy things. But our consumption habits often fuel threats to biodiversity—such as deforestation, overhunting and overfishing—thousands of miles away.


Now, scientists have mapped how major consuming countries drive threats to endangered species elsewhere. Such maps could be useful for finding the most efficient ways to protect critical areas important for biodiversity, the researchers suggest in a new study published in Nature Ecology & Evolution.

"Conservation measures must consider not just the point of impact, but also the consumer demand that ultimately drives resource use," the researchers wrote in the paper.

Researchers Daniel Moran of the Norwegian University of Science and Technology and Keiichiro Kanemoto of Shinshu University in Japan, identified 6,803 threatened species (species that are listed as vulnerable, endangered or critically endangered on the IUCN Red List) and pinpointed the commodities that contribute to various threats affecting those species. Then they traced the implicated commodities to their final consumers in 187 countries using a global trade model.

The resulting maps can tell which countries and which commodities, threaten species at the various hotspots, the researchers said.

For example, the maps show that commodities used in the U.S. and the European Union exert several threats on marine species in Southeast Asia, mainly due to overfishing, pollution and aquaculture. The U.S. also exerts pressure on hotspots off the Caribbean coast of Costa Rica and Nicaragua, and at the mouth of the Orinoco around Trinidad and Tobago. European Union's impacts extend to the islands around Madagascar: Réunion, Mauritius and the Seychelles.

The maps also revealed some unexpected linkages. For instance, the impact of U.S. consumption in Brazil appears to be much greater in southern Brazil (in the Brazilian Highlands where agriculture and grazing are extensive) than inside the Amazon basin, which receives a larger chunk of the attention. The U.S. also has high biodiversity footprint in southern Spain and Portugal, due to their impacts on threatened fish and bird species. These countries are rarely perceived as threat hotspots.

EU consumption is fueling threats in African countries like Morocco, Ethiopia, Madagascar and Zimbabwe. Similarly, consumption in Japan is driving threat hotspots in Southeast Asia, and around Colombo and southern Sri Lanka, where threats are linked to tea, rubber and other manufactured goods sent to Japan.

Global species threat hotspots linked to consumption in the EU-27.Moran and Kanemoto, Nature, Ecology & Evolution

The researchers write that their maps can help connect conservationists, consumers, companies and governments to better target conservation actions. Companies, for example, can use the maps to see where their inputs are sourced and to reduce their biodiversity impacts. Conservationists, too, can use the maps to identify the intermediate and final consumers whose purchases sustain industries that threaten endangered species.

"Connecting observations of environmental problems to economic activity, that is the innovation here," Moran said in a statement. "Once you connect the environmental impact to a supply chain, then many people along the supply chain, not only producers, can participate in cleaning up that supply chain."

Map showing areas of threat hotspots driven by U.S. consumption. Moran and Kanemoto, Nature, Ecology & Evolution

Global species threat hotspots linked to consumption in Japan.Moran and Kanemoto, Nature, Ecology & Evolution

Global species threat hotspots linked to consumption in the China.Map by Moran and Kanemoto, Nature, Ecology & Evolution

Reposted with permission from our media associate Mongabay.

A net-casting ogre-faced spider. CBG Photography Group, Centre for Biodiversity Genomics / CC BY-SA 3.0

Just in time for Halloween, scientists at Cornell University have published some frightening research, especially if you're an insect!

The ghoulishly named ogre-faced spider can "hear" with its legs and use that ability to catch insects flying behind it, the study published in Current Biology Thursday concluded.

"Spiders are sensitive to airborne sound," Cornell professor emeritus Dr. Charles Walcott, who was not involved with the study, told the Cornell Chronicle. "That's the big message really."

The net-casting, ogre-faced spider (Deinopis spinosa) has a unique hunting strategy, as study coauthor Cornell University postdoctoral researcher Jay Stafstrom explained in a video.

They hunt only at night using a special kind of web: an A-shaped frame made from non-sticky silk that supports a fuzzy rectangle that they hold with their front forelegs and use to trap prey.

They do this in two ways. In a maneuver called a "forward strike," they pounce down on prey moving beneath them on the ground. This is enabled by their large eyes — the biggest of any spider. These eyes give them 2,000 times the night vision that we have, Science explained.

But the spiders can also perform a move called the "backward strike," Stafstrom explained, in which they reach their legs behind them and catch insects flying through the air.

"So here comes a flying bug and somehow the spider gets information on the sound direction and its distance. The spiders time the 200-millisecond leap if the fly is within its capture zone – much like an over-the-shoulder catch. The spider gets its prey. They're accurate," coauthor Ronald Hoy, the D & D Joslovitz Merksamer Professor in the Department of Neurobiology and Behavior in the College of Arts and Sciences, told the Cornell Chronicle.

What the researchers wanted to understand was how the spiders could tell what was moving behind them when they have no ears.

It isn't a question of peripheral vision. In a 2016 study, the same team blindfolded the spiders and sent them out to hunt, Science explained. This prevented the spiders from making their forward strikes, but they were still able to catch prey using the backwards strike. The researchers thought the spiders were "hearing" their prey with the sensors on the tips of their legs. All spiders have these sensors, but scientists had previously thought they were only able to detect vibrations through surfaces, not sounds in the air.

To test how well the ogre-faced spiders could actually hear, the researchers conducted a two-part experiment.

First, they inserted electrodes into removed spider legs and into the brains of intact spiders. They put the spiders and the legs into a vibration-proof booth and played sounds from two meters (approximately 6.5 feet) away. The spiders and the legs responded to sounds from 100 hertz to 10,000 hertz.

Next, they played the five sounds that had triggered the biggest response to 25 spiders in the wild and 51 spiders in the lab. More than half the spiders did the "backward strike" move when they heard sounds that have a lower frequency similar to insect wing beats. When the higher frequency sounds were played, the spiders did not move. This suggests the higher frequencies may mimic the sounds of predators like birds.

University of Cincinnati spider behavioral ecologist George Uetz told Science that the results were a "surprise" that indicated science has much to learn about spiders as a whole. Because all spiders have these receptors on their legs, it is possible that all spiders can hear. This theory was first put forward by Walcott 60 years ago, but was dismissed at the time, according to the Cornell Chronicle. But studies of other spiders have turned up further evidence since. A 2016 study found that a kind of jumping spider can pick up sonic vibrations in the air.

"We don't know diddly about spiders," Uetz told Science. "They are much more complex than people ever thought they were."

Learning more provides scientists with an opportunity to study their sensory abilities in order to improve technology like bio-sensors, directional microphones and visual processing algorithms, Stafstrom told CNN.

Hoy agreed.

"The point is any understudied, underappreciated group has fascinating lives, even a yucky spider, and we can learn something from it," he told CNN.

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