1. How do cacti survive desert heat? – AskNature Nuggets


    from Biomimicry Institute / Added

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    In this episode, AskNature Nugget creator Andrea steps from behind the camera to talk about the adaptive properties of the saguaro and barrel cacti. How can humans better adapt to extreme heat and dry conditions? Let's look to nature's experts to find out. AskNature Nuggets | Episode 14 ___________________________________________ Transcript: Today we’re in the Arizona desert to talk about the adaptive properties of the saguaro cactus and the barrel cactus. Where humans use sunglasses and clothing to protect themselves from the sun, these particular cacti use special ridges and an accordion-like surface to survive the desert heat. The saguaro uses the ridges to its advantage as a shading mechanism. You can see that this area of the saguaro that’s currently exposed to sunlight will be shaded by the next ridge over. As the sun moves throughout the day, the ridges cast shadows, reducing the amount of surface area exposed to direct sunlight. The barrel cactus shades itself similarly but it also uses these ridges to expand and contract depending on the amount of moisture that it needs to hold. During the wetter seasons, these ridges allow the barrel cactus to actually expand and absorb more moisture in anticipation of the long, dry summers. So what can humans learn from the saguaro or the barrel cactus? Can we create self-cooling buildings based on the surface design? Or can we create packaging that expands and contracts without the use of any additional materials? Let’s ask ‘em.

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    • Cactus Comestible del Suroeste(Spanish)


      from San Pedro River Videos / Added

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      Cactus Comistible del Suroeste tienne que ver con los cactus que puedas comer. En Arizona y Sonora hay seis cactus que vamos a identificar y aprender cocenar o comer cruda.

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      • The Desert You Never Knew


        from Seth Ring / Added

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        Mr. Extreme gets schooled about the desert by local expert, Gabriela on the biodiversity of the Sonoran Desert. She also talks about desert creature's adaptations, invasive plants and ways to conserve water in the desert.

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        • 2009


          from Michelle Anne Harris / Added

          36 Plays / / 0 Comments

          Black and white animated gif with sound. Barrel cactus audio recorded by Terry Conrad

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