Animals
Some Greenland polar bears are surviving with very little sea ice
The ‘glacial mélange’ on which they’ve come to rely — a mix of ice, snow and slush — could be a temporary refuge for some polar bears.
By Nikk Ogasa
HS-LS2-6
Evaluate the claims, evidence, and reasoning that the complex interactions in ecosystems maintain relatively consistent numbers and types of organisms in stable conditions, but changing conditions may result in a new ecosystem.
More Stories in HS-LS2-6
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LifeExplainer: What is an invasive species?
These foreign organisms hitchhike, spread widely and stir up trouble in native ecosystems.
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EcosystemsRewilding returns lost species to strengthen ecosystems
Restoring the missing species can help undo human-caused problems by aiding forests, slowing climate change and reducing wildfires.
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EnvironmentCheatgrass thrives on the well-lit urban night scene
Middle-grade campers team up with ecologists at Denver University to show that streetlights boost the growth of a reviled invasive species.
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LifeSome pikas survive winter by eating yak poop
Pikas endure bone-chilling cold on the Tibetan Plateau by using little energy and fueling up on yak poop.
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AnimalsSpiders can take down and feast on surprisingly big snakes
Snared in sticky webs and subdued by poison, even venomous snakes can become a spider’s soup.
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AnimalsUrchin mobs can literally dis-arm a predator
Urchins are important herbivores — but not strict vegetarians. When hungry enough, they may even rip apart their predators for lunch.
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EcosystemsUrchin takeover underlies California’s vanishing kelp forests
Some 95 percent of kelp forests along its northern coast are gone. Meanwhile, sea otters are helping slow the loss of surviving kelp farther south.
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ClimateChanging climate now threatens northern lakes year round
Lakes in northern climes are getting warmer, and that’s not good for people, plants or animals.
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MicrobesSome microbial hitchhikers may weaken body’s attack on COVID-19
New research identifies an altered mix of microbes in the body — ones commonly seen in people with poor diets — that may worsen coronavirus disease.