One Degree of Difference
What makes you most hopeful for the future?
Somero: There are young people growing up who can see through all of the distortions thrust upon them by the media, notably the misinformation we're currently flooded with to the effect that "everything is just fine with the environment" and we needn't worry a bit about global warming...
See George Somero's full Q&A »
What makes you most fearful for the future?
Stillman: What makes me the most fearful is how increasing human populations will continue to impact the planet...
See Jonathon Stillman's full Q&A »
The impact of rising temperatures on animal and plant life is being measured across the world. Numerous studies are documenting latitudinal shifts in wildlife populations on land and sea – from butterflies to sea snails.
Scientists Somero and Stillman study how a minimal temperature change could affect the intertidal porcelain crab.
In California tide pools, similar changes are being witnessed as southern species progressively move into more northern reaches, driven by warming.
Research studies indicate some species may be subjected to severe physiological stresses before they relocate. Physiologists George Somero and Jonathon Stillman are studying how a simple one-degree change in temperature could affect the intertidal porcelain crab. In an experiment to test the thermal tolerance of these crabs, Stillman hooked up the small animals to a heart rate monitor, immersed them in water and gradually increased the temperature. He discovered that those crabs currently experiencing the biggest daily temperature swings are already just about at their limit. Their hearts stop beating in water only two degrees Fahrenheit warmer than what they currently experience in the wild. With global warming increasing, these crabs are edging ever closer to their absolute limits.
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