Tag Archives: ecosystems

How Light Pollution Affects Wildlife and Ecosystems

Night skies throughout the world are becoming brighter due to humans increasing use of artificial lights. This doesnt simply interrupt our star gazing opportunities it has a significant impact on many different animal species.

The term light pollution generally refers to how urban lighting blocks out our view of the night sky. But researchers are becoming more concerned about whats called ecological light pollution, which alters light levels in terrestrial and aquatic ecosystems. The following are some of their discoveries on the effects of ecological light pollution.

Bird Navigation

Nocturnal bird species use the moon and stars for navigation during migrations. Artificial lighting on tall office buildings, communication towers and other brightly-lit structures has been shown to throw them off-course with often fatal results.

Migrating birds are attracted to artificial lights and will fly in circles around them until they die from exhaustion or predators. Lights also cause a significant number of collisions with human-made structures.

For instance, a 4-year study that concluded in 2007 counted fatal night-time bird collisions at an illuminated offshore research platform in the North Sea. At the end of the study, 767 bird carcasses of 34 different species had been collected. Considering there are over 1,000 human structures in the North Sea, researchers estimated that hundreds of thousands of nocturnal migrating birds could be killed each year in that area alone.

Communication

Some night-dwelling creatures require darkness for proper communication. An example is the complex system fireflies use to communicate messages. The bioluminescent lights they emit from their bodies range from adult mating signals to young larvae warning off predators. These messages can be easily interrupted by stray light.

Darkness is also important for coyote communication. Coyotes howl more during the time of a new moon, when the sky is darkest. They most likely do this to reduce trespassing from other packs or to assist with hunting larger prey during dark conditions. A brighter sky reduces the amount they howl, which could disrupt territorial marking and group hunting coordination.

Reproduction

The reproductive behaviors of many animals may also be altered by light pollution. For instance, female glow-worms use bioluminescent flashes in order to attract males up to 45 meters (150 feet) away. Artificial lights can disrupt these important signals.

Its been found that the female South American tungara frog is less selective about mate choice when greater amounts of light are present. Researchers suggest they may prefer to mate quickly in order to avoid an increased risk of predation in higher light.

Another experiment showed that frogs stopped their mating activity during night football games where a local sports stadium increased sky glow. Frog mating choruses resumed when a shield was put up to block the stadiums light from the frogs habitat.

Ecosystem Interactions

Many predator-prey relationships are dependent on light. One study found that more harbor seals congregated under artificial lights to eat juvenile salmon migrating downstream. When the lights were turned off, the seals ate less salmon. This shows how increased light pollution can disrupt a natural balance, benefitting one species and putting another at risk.

The loss of nocturnal moths is another example of how local ecology can be impacted. Moths are attracted to lights and many are killed annually by touching hot components or getting caught in light-bated electric traps. The bats and birds who feed on them lose a food source. Also, moths play an important role in pollination for many different plant species. These are affected by declining moth populations.

Disorientation

Artificial night lighting may also disorient creatures that rely on darkness for navigation. The disruption of newly hatched baby sea turtles is a well-documented case.

When the hatchlings emerge from nests on sandy beaches, they will naturally move away from the dark silhouettes of vegetation on the beach. This causes them to head towards the open ocean. Beachfront lighting prevents the young turtles from seeing the silhouettes properly, and they become disoriented and remain stranded on the beach exposed to the elements and predators. Millions of hatchlings die this way each year.

What Can Be Done?

Many places throughout the world have taken steps to reduce light pollution. Audubon started a Lights Out program that now includes many major US cities.

In addition, the International Dark Sky Association works to conserve areas with dark skies through public education and designating Dark Sky communities, parks, and reserves. These are all listed on their website and many are open to visitors.

You can also take action at home to reduce ecological light pollution. Some helpful measures include:

Avoid using unnecessary interior or exterior lighting.
Install motion sensors on all outdoor lights. This will also help reduce your electricity costs.
Turn off any lights at night that are not motion sensing.
Take extra care to reduce night lighting during bird migration periods, typically in April and May, and again in August through to November.
Ensure all exterior lighting is fully shielded so light is prevented from shining upwards into the sky. These fixtures may also be called zero light up or dark sky compliant. The International Dark Sky Association has further information on types of fixtures to look for.
Use yellow or red lights when possible. These have a lower impact on wildlife and dont attract insects.
Install window coverings that block as much light from escaping as possible.

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Disclaimer: The views expressed above are solely those of the author and may not reflect those of Care2, Inc., its employees or advertisers.

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How Light Pollution Affects Wildlife and Ecosystems

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Op-Ed Contributors: T-Shirt Weather in the Arctic

As the planet warms, we need new approaches to identify which species and ecosystems are most at risk. See original:   Op-Ed Contributors: T-Shirt Weather in the Arctic ; ; ;

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Op-Ed Contributors: T-Shirt Weather in the Arctic

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Op-Ed Columnist: What Is News?

Madagascar, one of the world’s greatest ecosystems, is on the edge. Original source:  Op-Ed Columnist: What Is News? ; ;Related ArticlesU.S. Military Is Scrutinized Over Trash Burning in AfghanistanThe Big Fix: Corralling Carbon Before It Belches From StackWashington Mudslide Report Cites Rain, but Doesn’t Give Cause or Assign Blame ;

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Op-Ed Columnist: What Is News?

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Using Putin To Push Fossil-Fuel Projects

Will natural gas exports really solve the Ukraine crisis? Experts aren’t so sure. A trade union building being seized in Simferopol, Ukraine. Stanislav Krasilnikov/ITAR-TASS/ZUMA The hallmark of a Republican policy proposal is that it can be adapted to virtually any circumstance. Just as George W. Bush advanced tax cuts as the appropriate response to both budget surplus and deficit, congressional Republicans believe that fossil fuel promotion is the appropriate response to, well, everything. And so they have looked at the vexing problem of Russia’s invasion of Ukraine’s Crimea region and come up with a carefully calibrated answer: “Drill, baby, drill!” First, Sen. Lisa Murkowski (R-Alaska) was struck with a brilliant insight: If Russia’s meddling in Ukraine is dangerous because Russiasupplies Europe with oil and natural gas through pipelines that traverse Ukraine, then the U.S. should offer Europe an alternative source of fossil fuels. And so, she argues, the Obama administration should expedite approval of liquefied natural gas (LNG) terminals. “Our ability to respond quickly and nimbly I think is somewhat hampered by the process that we have in place,” she told reporters at an energy industry conference in Houston on Monday. “If this was a situation in which we wanted to use as political leverage our natural gas opportunities here, we’re not in that place now, and quite honestly it may be some time.” In her speech to the gathering, she also called on Congress to repeal the ban on exporting crude oil, saying, “Lifting the oil export ban will send a powerful message that America has the resources and the resolve to be the preeminent power in the world.” Read the rest at Grist. See the article here –  Using Putin To Push Fossil-Fuel Projects ; ;Related ArticlesCitizen Scientists: Now You Can Link the UK Winter Deluge To Climate ChangeHere Are 5 Infuriating Examples of Facts Making People DumberA World of Water, Seen From Space ;

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Using Putin To Push Fossil-Fuel Projects

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Here Are 5 Infuriating Examples of Facts Making People Dumber

The notorious “backfire effect” has now been captured in multiple studies. Alex E. Proimos/Wikimedia Commons On Monday, I reported on the latest study to take a bite out of the idea of human rationality. In a paper just published in Pediatrics, Brendan Nyhan of Dartmouth and his colleagues showed that presenting people with information confirming the safety of vaccines triggered a “backfire effect,” in which people who already distrusted vaccines actually became less likely to say they would vaccinate their kids. Unfortunately, this is hardly the only example of such a frustrating response being documented by researchers. Nyhan and his co-author Jason Reifler of the University of Exeter have captured several others, as have other researchers. Here are some examples: 1. Tax Cuts Increase Revenue? In a 2010 study, Nyhan and Reifler asked people to read a fake newspaper article containing a real quotation of George W. Bush, in which the former president asserted that his tax cuts “helped increase revenues to the Treasury.” In some versions of the article, this false claim was then debunked by economic evidence: A correction appended to the end of the article stated that in fact, the Bush tax cuts “were followed by an unprecedented three-year decline in nominal tax revenues, from $2 trillion in 2000 to $1.8 trillion in 2003.” The study found that conservatives who read the correction were twice as likely to believe Bush’s claim was true as were conservatives who did not read the correction. 2. Death Panels! Another notorious political falsehood is Sarah Palin’s claim that Obamacare would create “death panels.” To test whether they could undo the damage caused by this highly influential morsel of misinformation, Nyhan and his colleagues had study subjects read an article about the “death panels” claim, which in some cases ended with a factual correction explaining that “nonpartisan health care experts have concluded that Palin is wrong.” Among survey respondents who were very pro-Palin and who had a high level of political knowledge, the correction actually made them more likely to wrongly embrace the false “death panels” theory. 3. Obama is a Muslim! And if that’s still not enough, yet another Nyhan and Reifler study examined the persistence of the “President Obama is a Muslim” myth. In this case, respondents watched a video of President Obama denying that he is a Muslim or even stating affirmatively, “I am a Christian.” Once again, the correction—uttered in this case by the president himself—often backfired in the study, making belief in the falsehood that Obama is a Muslim worse among certain study participants. What’s more, the backfire effect was particularly notable when the researchers administering the study were white. When they were non-white, subjects were more willing to change their minds, an effect the researchers explained by noting that “social desirability concerns may affect how respondents behave when asked about sensitive topics.” In other words, in the company of someone from a different race than their own, people tend to shift their responses based upon what they think that person’s worldview might be. 4. The Alleged Iraq-Al Qaeda Link. In a 2009 study, Monica Prasad of Northwestern University and her colleagues directly challenged Republican partisans about their false belief that Iraq and Al Qaeda collaborated in the 9/11 attacks, a common charge during the Bush years. The so-called challenge interviews included citing the findings of the 9/11 Commission and even a statement by George W. Bush, asserting that his administration had “never said that the 9/11 attacks were orchestrated between Saddam and Al Qaeda.” Despite these facts, only one out of 49 partisans changed his or her mind after the factual correction. Forty-one of the partisans “deflected” the information in a variety of ways, and 7 actually denied holding the belief in the first place (although they clearly had). 5. Global Warming. On the climate issue, there does not appear to be any study that clearly documents a backfire effect. However, in a 2011 study, researchers at American University and Ohio State found a closely related “boomerang effect.” In the experiment, research subjects from upstate New York read news articles about how climate change might increase the spread of West Nile Virus, which were accompanied by the pictures of the faces of farmers who might be affected. But in one case, the people were said to be farmers in upstate New York (in other words, victims who were quite socially similar to the research subjects); in the other, they were described as farmers from either Georgia or from France (much more distant victims). The intent of the article was to raise concern about the health consequences of climate change, but when Republicans read the article about the more distant farmers, their support for action on climate change decreased, a pattern that was stronger as their Republican partisanship increased. (When Republicans read about the proximate, New York farmers, there was no boomerang effect, but they did not become more supportive of climate action either.) Together, all of these studies support the theory of “motivated reasoning”: The idea that our prior beliefs, commitments, and emotions drive our responses to new information, such that when we are faced with facts that deeply challenge these commitments, we fight back against them to defend our identities. So next time you feel the urge to argue back against some idiot on the Internet…pause, take a deep breath, and realize not only that arguing might not do any good, but that in fact, it might very well backfire. View original:  Here Are 5 Infuriating Examples of Facts Making People Dumber ; ;Related ArticlesCitizen Scientists: Now You Can Link the UK Winter Deluge To Climate ChangeA World of Water, Seen From SpaceLow-Lying Islands Are Going To Drown, so Should we Even Bother Trying To Save Their Ecosystems? ;

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Here Are 5 Infuriating Examples of Facts Making People Dumber

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