Stone stacking destroys the environment for clicks and likes

Stone stackers enjoy the practice as a peaceful challenge, but scientists warn that moving small stones has mountainous consequences.

  • In recent years, stone stacks have become a popular pastime on social media and in our national parks.
  • Scientists and conservationists warn that such stacks cause ecological damage and risk the survival of many endemic plant and animal species.
  • The problem is one of scale: The more popular the pastime becomes, the great the damage to our natural parks and reserves.
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    Humanity’s impact is monkeying with animals’ evolution

    Animals are adapting all the time these days to stay out of our way.

    Image source: Sergei Mironenko/Shutterstock
    • Evolution is something that happens over time, but animals (humans included) are always mutating and adapting.
    • Thanks to human presence and interference, animals are experiencing what has been referred to as "human-guided evolution."
    • More animals are becoming night owls. Pollution determines which moths dominate the tree trunks of the U.K. Are these short-term changes, or is humanity doing lasting damage?

    We often think of evolution as taking place over extended periods of time as mutations prove themselves advantageous, or not. Mutations, though, are not rare things: They happen all the time. Scientists estimate that there were 37 trillion of them in your own body just over the last 24 hours. (It's amazing more things don't go wrong, right?) The characteristics we see in ourselves and other organisms are merely the latest winners in a wild and woolly mutation free-for-all competition, in which nature, or random chance, tries out many wonderful, bizarre, and ridiculous traits as things settle out over the long term.

    Adaptations in response to changing environmental factors occur all the time, too: An attribute that may have been meaningless before may suddenly become very helpful. Here in the Anthropocene, animals are adapting to all sort of habitat changes we've imposed on them. While not yet long-term changes, necessarily, these characteristics suggest we may be having a considerable impact on the ongoing process of evolution in the world's organisms.

    Industrialized moths

    light peppered moth

    Image source: Marek R. Swadzba/Shutterstock

    Before the Industrial Revolution got up and running in the U.K., light-colored peppered moths, Biston betularia morpha typica, were a common sight. However, by about 1864, they'd been essentially replaced by a darker peppered-moth cousin, Biston betularia morpha carbonaria. Why?

    Pollutants — mostly coal soot —covered the British countryside, darkening its trees. Worse, sulfur dioxide emissions wiped out many of the trees' lichen and moss coverings. Against these darkened backdrops, light-colored peppered moths became far too easy to spot by predators. Better suited were the darker peppered moths, which soon came to dominate the habitat — by 1895, some 95 percent of peppered moths spotted were the darker variety.

    Fortunately, the Industrial Revolution days passed, with dirty factories over time being replaced by cleaner alternatives, and today, the light-colored peppered moths are back on top.

    The story is a pretty fast-paced and dramatic example of how extreme our impact can be, and also — and there's a hopeful feeling to this — how short-lived it can be if we fix what we've broken.

    Foxy

    Urban vs. rural red fox skull measurements

    Urban vs. rural red fox skull measurements

    Image source: K.J. Parsons, et al

    Researchers published in June a really interesting study regarding a surprising way in which foxes are adapting to life in human-dominated urban environments.

    An examination of 111 red fox skulls from London, UK, revealed "urban individuals tending to have shorter and wider muzzles relative to rural individuals." Essentially, the more urban a fox's environment is, the shorter its snout was likely to be. The change may be considered an example of Darwin's "domestication syndrome," as Big Think previously reported.

    The study suggests it's all about the biomechanics benefits imparted by such a change:

    "Firstly, a shorter snout, as found in urban foxes, should confer a higher mechanical advantage but with reduced closing speed of the jaw. This may be advantageous in an urban habitat where resources are more likely to be accessed as stationary patches of discarded human foods. Furthermore, in some cases, these foods may require a greater force to access them, explaining the expanded sagittal crest in skulls of urban foxes."

    If these traits make an individual fox better suited to its city life, it's that much more likely to survive and reproduce than a longer-snouted competitor.

    Nighttime on human Earth

    gull standing on urban sidewalk

    Image source: Viktor Grishchenko/Shutterstock

    Habitat loss is the single most destructive thing we're doing to animals. It can lead to utter displacement and death, and it can also change the way animals go about doing the things they need to do to survive.

    In many cases, animals dealing with fresh human encroachment bend before they break, and some are trying to carry on around us, so to speak. A 2018 study in the journal Science finds, for example, that animals are becoming more nocturnal to get out of the bipeds' way.

    The authors of the study analyzed data from 76 other reports to learn how 62 species on six continents were trying to adapt to our intrusive presence. The data was sourced from all sorts of devices such as cameras to GPS trackers, and ran the gamut from 'possums to pachyderms.

    What the researchers found was that animals known to split their activities between day and night were overwhelmingly becoming busier after dark. There was a 68 percent increase in nighttime activity among such animals.

    If this habitat pressure continues, will we start to see individuals with, for example, better night vision, come to dominate as competitors for scarce resources? It'll be interesting to see.

    Evolution

    When people say, "Such and such animal has this trait because it allows them to…" what they're really saying is that "Of all the crazy mutations that nature tried out, individuals with this mutation fared better than others did." Whether it's effective camouflage, the ditching of a trunk, or becoming a night owl — except for owls who already… never mind — temporary adaptations become fixed evolutionary traits when the conditions in which they are beneficial remain in place long enough. In the case of the pressure we're continually imposing on other life forms, it bears saying that only the ones lucky enough to survive humankind's challenging influence in the first place will get that chance to change.

    Hey, methane leakers: Now we know where you live

    A European start-up uses satellite data to pinpoint individual sources of abnormal methane concentration.

    Image: Kayrros
    • Just 100 sources of methane emit 20 megatons each year.
    • Thanks to satellite data, individual culprits can now be found.
    • The new tech could be used to police 'abnormal' methane emissions.
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    Space exploration is the ultimate plan B. Here’s why.

    Why did the dinosaurs go extinct? Because they didn't have a space program.

    • Space exploration is more than just the ultimate adventure, our study and investigation of space yields great scientific rewards, says astronaut Garrett Reisman.
    • Earth is wonderful, but it won't last forever, so it's important that we maintain a big picture view to ensure the survival of the human species.
    • Exploring space is our ticket to "the ultimate plan B," according to Reisman. If there were to occur a mass extinction event on Earth, the humans that inhabit another planet in our solar system will be the only hope of human survival.
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    Kate the Chemist: Water is a freak substance. Here’s why.

    Dr. Kate Biberdorf explains why boiling water makes it safer and how water molecules are unusual and cool.

    • University of Texas professor and science entertainer Kate the Chemist joined Big Think to talk about water molecules and to answer two interesting and important questions: Why does boiling water make it safe to drink, and what happens to water when you boil or freeze it?
    • According to Kate, when water is heated to a certain temperature (100°C/ 212°F) the hydrogen bonds break and it goes from a liquid to a gas state. Boiling for a minimum of 5 minutes kills any viruses and bacteria that were in the water.
    • "Water is a freak and so it is one of my favorite molecules ever," Kate says. "It has these unique properties and we are surrounded by it constantly. We also are made of water. We have to drink water to survive...It's a really, really fun molecule to investigate."

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