How Invasive Crayfish Help More Mosquitoes Thrive

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iStock

When invasive species somehow find their way into an environment where they don’t belong, they can disrupt everything from the food web to public health.

Recently, researchers at UCLA and other California institutions discovered an unwelcome squatter that might directly affect the spread of mosquito-borne disease. It’s the red swamp crayfish, a tasty delicacy often found in gumbo that may also be allowing mosquito populations to thrive.

Native to the southeastern U.S., the crayfish are now found in California. While investigating their damaging ecological presence, scientists made a chilling observation: In streams where crayfish concentrations were high, there was a noticeable spike in the number of mosquito larvae. They found something else, too—a sharp decline in the larvae-eating dragonfly nymphs that they would expect to see in the area.

In the paper, published in Conservation Biology, lead author Gary Bucciarelli observed 13 streams in the Santa Monica Mountains. Eight had crayfish populations and were high in mosquito larvae but low on dragonfly nymphs. Five crayfish-free streams had more nymphs and fewer larvae.

In a lab experiment putting the crayfish, mosquitoes, and dragonflies in proximity, Bucciarelli watched as the dragonfly nymphs—normally happy to prey on mosquito larvae—kept their distance in the presence of crayfish, apparently spooked by the crustaceans. In the wild, high concentrations of crayfish appear to be interrupting the dragonflies' hunting habits, allowing more mosquitoes to roam unchecked.

That’s not great news for humans. Mosquitoes are notorious for spreading viral diseases like West Nile, Zika, and malaria. In Los Angeles, where the mosquito population could conceivably get a boost, 15 of the 16 mosquito species can harbor pathogens that pose a threat to public health.

No one is quite sure how crayfish spread to the area—it’s possible fishermen used them as bait decades ago—but it's likely their presence will continue interfering with native species. In 2015, a nonprofit backed by the California Department of Fish and Wildlife started removing crayfish from the Santa Monica streams using traps set by volunteers. The captured crayfish were sent to Malibu to become snack fodder for opossums and raccoons. But it’s a sizable task. Roughly 600 crayfish might be caught in a given day out of the millions thought to inhabit the waters.

Conservationists might soon pursue more aggressive means to combat the crayfish's damaging ecological footprint. In addition to scaring dragonflies into inaction, they can threaten the integrity of underwater dams by burrowing and consume plants that help purify the water.

h/t National Geographic]

A LEGO Brick Could Survive In the Ocean for Up to 1300 Years

If LEGO bricks can survive children, they can survive anything.
If LEGO bricks can survive children, they can survive anything.
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As any parent who has ever walked through their house in bare feet knows, LEGO bricks are among the most resilient objects on the planet. Able to withstand years of manipulation and abuse, the sets remain intact even when doll heads, action figure limbs, and electronic games fall by the wayside.

If you needed further confirmation on their durability, science is here to help. New research from the University of Plymouth in the UK published in the journal Environmental Pollution demonstrates that the bricks could survive in some form for as long as 1300 years in the ocean. Not even constant exposure to saltwater can stop them.

This projection was determined by researchers collecting LEGO bricks that had washed ashore in Southwest England. They compared the mass of these found bricks to similar LEGOs taken from storage. The 50 pieces, which are made of acrylonitrile butadiene styrene (ABS) plastic, were retrieved from outdoor saltwater exposure to be washed, weighed, and measured. Their approximate age was estimated by using an X-ray fluorescence spectrometer to see which chemical elements were missing. A rate of deterioration was made based on their condition relative to the stored bricks.

The result? LEGO bricks could hold on to some semblance of shape for anywhere between 100 to 1300 years. While not necessarily usable—some of the pieces decayed into blobs of plastic—researchers were able to demonstrate that microplastics can endure in the environment for indefinite periods.

“The pieces we tested had smoothed and discolored, with some of the structures having fractured and fragmented, suggested that as well as pieces remaining intact they might also break down into microplastics,” Andrew Turner, the lead author and associate professor of environmental sciences at the University of Plymouth, said in a statement. “It once again emphasizes the importance of people disposing of used items properly to ensure they do not pose potential problems for the environment.”

[h/t Geek.com]

15 Easy Ways You Can Reduce Your Carbon Footprint

iStock/Zinkevych
iStock/Zinkevych

Imagine a landmass the size of the entire continent of Africa burning as a massive forest fire for an entire year. Such an enormous fire would release nearly 40 billion metric tons of carbon dioxide into the atmosphere—the same amount that human activity produces every year, according to the National Oceanic and Atmospheric Administration's 2015 numbers. The scale at which we're pumping out CO2 is alarming, and it is all serving to trap heat on the planet and fuel climate change. Fortunately, there are small, easy steps everyone can take to reduce their personal carbon footprint (which you can calculate here).

1. Skip the bacon, egg, and cheese sandwich …

A picture of a breakfast sandwich.
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Your breakfast sandwich, while delicious, isn't eco-friendly. Livestock consume a lot of resources and release the greenhouse gas methane into the environment every time they burp and fart—which means animal products come at a high environmental cost. Add the toll that transporting and packaging the ingredients takes on the environment, and the average bacon, egg, and cheese sandwich comes out to about 1441 grams CO2 equivalent (a unit that measures global warming potential). For comparison, driving a car four miles produces about 1650 grams CO2 equivalent. Maybe grab some locally grown fruit the next time you're looking for a portable morning bite.

2. … and the grass-fed beef.

A cow grazing on grass.
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Grass-fed beef has been embraced by the organic food movement, leading some people to believe it's the better choice for the environment. But a 2017 report released by Oxford's Food Climate Research Network shows this isn't the case: Grass-fed cattle only accounts for 1 gram of protein, per person, per day, compared to 13 grams from all ruminants, which includes cows, sheep, and goats. Despite this, grass-fed cattle still contribute one-third of all the greenhouse gases produced by ruminants—and the carbon-absorbing pastures they graze in don't do much to offset that. But grain-fed, factory-farmed meat isn't much better for the environment, and it comes with a whole different set of concerns, so a better option is to cut meat from your diet where you can.

3. when you Fly, book coach seats.

Airplane seats.
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Traveling somewhere by plane is the quickest way to expand your carbon footprint. Just one round-trip flight between New York and Los Angeles produces about a fifth of the emissions your car creates in a year. The best option for the environment is to fly less or not at all, but this is unrealistic for some people. An alternative is to book your seats in coach. Because they're allotted less space, and therefore require less fuel, passengers flying economy are linked to three times fewer emissions than those flying in business class. Look at first class and the difference is even more dramatic: Those flyers account for nine times the carbon emissions of passengers in coach.

4. Shop for clothes at second-hand stores.

Shopping at a thrift store.
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Next time you have a moment alone, check the tags of the clothes you have on. Unless you're a mindful shopper, your wardrobe likely crossed thousands of miles before ending up in your possession. The resources that go into making a single garment also add up: According to a report from Dame Ellen MacArthur's foundation, the fashion industry produces 1.2 billion tons of greenhouse gas emissions a year. Fortunately, there's an alternative to buying clothes from major chains that doesn't involve joining a nudist colony. Next time you need to replenish your closet, head to a second-hand store. Buying gently used clothing is better for the environment, and many thrift stores donate part of the proceeds to charitable causes.

5. Ride a Bike.

Man riding his bike.
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It's easy to see how biking can reduce your carbon footprint. While the typical passenger car releases about 404 grams of CO2 per mile, a bicycle emits zero. If you live in a bikeable city or in an area with mild weather year-round, a bike is a worthwhile investment. Even if a bike can't replace your car completely, for shorter trips it's a great way to be gentle on the environment while saving gas money and getting a cardio workout at the same time.

6. Turn down your thermostat.

A smart thermostat.
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Heating your home in the winter is expensive, and it can also be a major contributor to your carbon footprint. Do the planet and your wallet a favor and turn down the thermostat by a degree or two when you're in the house. At night you should turn the heat down even lower, and when you're away you should turn it off altogether. Investing in a smart thermostat that senses when you're in the house and adjusts itself is another way to reduce your carbon emissions.

7. Hang your clothes to dry instead of using a dryer.

Clothesline.
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If you have the yard space for a clothesline, take advantage of it. According to The Guardian, a household that uses a dryer 200 times a year could shrink its carbon footprint by roughly half a ton of CO2 by air-drying laundry instead. Even if you don't have the option to use a clothesline year-round, avoiding the dryer for just half your loads would make a difference.

8. Unplug the appliances when you're not using them.

Unplugging a slow cooker.
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Just because an appliance is turned off doesn't mean it isn't consuming energy. According to How Stuff Works, the "phantom energy" zapped up by electronics that stay plugged into an outlet around the clock can account for 10 percent of your electric bill (which, if you factor it out, would be more than a free month's worth of electricity each year). If you can't stand plugging and unplugging every gadget around your home all day, try leaving appliances you don't use on a daily basis, like toasters, desk lamps, etc., unplugged and only power them up when you need them.

9. Reuse items whenever you can.

Reusable shopping bags.
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Every piece of waste you toss in the garbage adds to your carbon footprint. You may not be able to bring your trash production down to nothing, but you can reduce it by investing in non-disposable goods that can withstand a bit of wear and tear. Reuseable shopping bags, food storage containers, coffee cups, and straws can replace many of the items that are often thrown away every day.

10. Switch out your old light bulbs for energy-saving ones.

Energy-efficient lightbulbs.
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If you still use incandescent bulbs to light your home, it's time to make a change. Incandescents use electricity inefficiently, adding money to your electricity bill and your home cooling expenses, thanks to the excess heat they generate. Energy Star-qualified light bulbs like CFLs (compact fluorescents) and LEDs (light-emitting diodes) are more energy-efficient than the average light bulb and last six times as long. If every household in America swapped just one regular light bulb for one of these options, we could reduce CO2 emissions by 9 billion pounds.

11. Carpool with your work buds.

People carpooling.
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For trips where biking isn't an option, see if you can find a friend. Car travel isn't great for the environment, but hitching a ride with someone going the same direction as you makes a much smaller impact than driving alone. Next time you're at work, look around the office for potential carpool buddies. And before your next night out with friends, suggest a system that doesn't involve everyone coming in a separate car.

12. Wash your clothes in cold water.

Washing machine.
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One way to make your electric laundry machine a little gentler on the environment is to switch on the cold water setting. That simple change can reduce your washer's carbon emissions by 75 percent and save you $60 for every 300 loads of laundry you clean. And for lightly soiled clothing, cold water sanitizes just as well as a warm wash.

13. Use curtains for temperature control.

Curtains aren't just there for privacy—throughout the year, they can help lower your energy consumption. When the sun is hitting the house, keep your windows clear in the winter to take advantage of that free heat source, and close them during peak daylight hours during the summer (especially when you aren't at home). On winter nights, conserve energy by drawing your curtains closed and blocking the heat inside from leaking out, and either open your windows at night for a fresh breeze or close your curtains to keep the air conditioning in during the warmer months. Keep up these habits year-round and you'll see the difference in your heating and cooling bills.

14. Take shorter showers.

A shower head running water.
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You don't need to deprive yourself of the pleasure of a hot shower to adopt a more eco-friendly lifestyle. According to Mother Jones, we would save 20.9 billion pounds of CO2 a year if we all shaved one minute off our shower sessions. If that change sounds easy for you, try taking the five-minute shower challenge for a week or two.

15. Plant a tree.

People planting a tree.
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One of the easiest ways to take care of the planet is also the most fun. Set aside an afternoon to plant a tree in your backyard and the benefits will last its whole life. A young tree absorbs roughly 13 pounds of CO2 per year and a mature tree can absorb 48 pounds. After 40 years, a tree will have sequestered 1 ton of carbon that would have otherwise contributed to global warming.

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