By Elizabeth Devitt, Bay Nature
Cara Gallagher spends a lot of time on the Golden Gate Bridge, scanning the cold waters below for evidence to solve a really challenging math problem.
Gallagher knows the bay’s porpoise population is rebounding, from zero as recently as a decade ago to at least 600. Although all those porpoises are not fishing for food in the bay at the same time – they probably come and go from the larger population of about 2,500 to 3,000 along the outer coast – the inland waters have clearly become popular with the porpoises. What Gallagher wants to know is: What does that mean about the bay ecosystem itself, and how could you start to tell?
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