Placeholder Image

字幕表 動画を再生する

  • Have you ever heard the sound of frogs

  • calling at night?

  • For hundreds of millions of years,

  • this croaking lullaby has filled the nighttime air.

  • But recent studies suggest

  • that these frogs are in danger

  • of playing their final note.

  • Over the past few decades,

  • amphibian populations have been rapidly disappearing worldwide.

  • Nearly one-third of the world's amphibian species

  • are endanger of extinction,

  • and over 100 species have already disappeared.

  • But don't worry, there's still hope.

  • Before we get into how to save the frogs,

  • let's start by taking a look

  • at why they're disappearing

  • and why it's important to keep them around.

  • Habitat destruction is the number one problem

  • for frog populations around the world.

  • There are seven billion humans on the planet,

  • and we compete with frogs for habitat.

  • We build cities, suburbs, and farms

  • on top of frog habitat

  • and chop forests

  • and drain the wetlands

  • that serve as home

  • for numerous amphibian populations.

  • Climate change alters precipitation levels,

  • drying up ponds, streams, and cloud forests.

  • As the Earth's human population continues to grow,

  • so will the threats amphibians face.

  • There are a variety of other factors

  • contributing to the frogs' decline.

  • Over-harvesting for the pet and food trade

  • results in millions of frogs

  • being taken out of the wild each year.

  • Invasive species,

  • such as non-native trout and crawfish,

  • eat native frogs.

  • Humans are facilitating the spread

  • of infectious diseases

  • by shipping over 100 million amphibians

  • around the world each year

  • for use as food, pets, bait,

  • and in laboratories and zoos,

  • with few regulations or quarantines.

  • One of these diseases,

  • chytridiomycosis,

  • has driven stream-dwelling amphibian populations

  • to extinction

  • in Africa,

  • Australia,

  • Europe,

  • and North, Central, and South America.

  • On top of all these problems,

  • we add hundreds of millions of kilograms of pesticides

  • to our ecosystems each year.

  • And these chemicals are easily absorbed

  • through amphibians' permeable skin,

  • causing immunosuppression,

  • or a weakened immune system,

  • and developmental deformities.

  • Okay, so why are these little green guys

  • worth keeping around?

  • Frogs are important for a multitude of reasons.

  • They're an integral part of the food web,

  • eating flies, ticks, mosquitoes,

  • and other disease vectors,

  • thus, protecting us against malaria,

  • dengue fever,

  • and other illnesses.

  • Tadpoles keep waterways clean

  • by feeding on algae,

  • reducing the demand

  • on our community's filtration systems

  • and keeping our cost of water low.

  • Frogs serve as a source of food

  • for birds, fish, snakes, dragonflies, and even monkeys.

  • When frogs disappear,

  • the food web is disturbed,

  • and other animals can disappear as well.

  • Amphibians are also extremely important

  • in human medicine.

  • Over ten percent of the Nobel prizes

  • in physiology and medicine

  • have gone to researchers

  • whose work depended on amphibians.

  • Some of the antimicrobial peptides

  • on frog skin can kill HIV,

  • some act as pain killers,

  • and others serve as natural mosquito repellents.

  • Many discoveries await us

  • if we can save the frogs,

  • but when a frog species disappears,

  • so does any promise it holds

  • for improving human health.

  • Fortunately, there are lots of ways you can help,

  • and the best place to start

  • is by improving your ecological footprint

  • and day-to-day actions.

  • The next time you listen to that nighttime lullaby,

  • don't think of it as just another background noise,

  • hear it as a call for help,

  • sung in perfect croaking harmony.

Have you ever heard the sound of frogs

字幕と単語

動画の操作 ここで「動画」の調整と「字幕」の表示を設定することができます

B2 中上級

TED-ED】消えゆくカエル - ケリー・M・クリガー (【TED-Ed】Disappearing frogs - Kerry M. Kriger)

  • 934 76
    阿多賓 に公開 2021 年 01 月 14 日
動画の中の単語