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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .Collecting seashells is a classic part of a beach vacation.
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3 .But this seemingly innocent pastime can have serious environmental effects.
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4 .Starting 30 years ago, a survey was made of the shells on Spain's Llarga Beach every month for three years.
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5 .When researchers repeated the count just a few years ago, the number of shells was down by two-thirds compared with their former numbers.
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6 .Urbanization or commercial fishing were the likely culprits,
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7 .but the area experienced no significant increase in either.
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8 .It did, however, see a threefold bump in tourism.
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9 .And the number of shells on the beach dropped significantly during times of the heaviest tourism.
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10 .The study is in the journal PLOS ONE.
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11 .Shells provide homes and hiding places for organisms from hermit crabs to algae, contribute to the global carbon balance, and even help prevent beach erosion.
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12 .If tourists worldwide are taking shells in significant numbers, it could have a major impact on beach environments.
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13 .In other words, sightseers shouldn't seize seashells by the seashore.
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14 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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