Pteropods, affectionately nicknamed "sea butterflies," are at the bottom of the ocean food chain.
If pteropod populations decline or disappear due to rising acidity, the consequences for marine life could be dire.
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© WGBH Educational Foundation 2015
(main image: pteropod)
©WGBH Educational Foundation 2015
This is an excerpt from the NOVA program "Lethal Seas."