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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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Collecting seashells is a classic part of a beach vacation.

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But this seemingly innocent pastime can have serious environmental effects.

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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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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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Urbanization or commercial fishing were the likely culprits,

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but the area experienced no significant increase in either.

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It did, however, see a threefold bump in tourism.

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And the number of shells on the beach dropped significantly during times of the heaviest tourism.

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The study is in the journal PLOS ONE.

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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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If tourists worldwide are taking shells in significant numbers, it could have a major impact on beach environments.

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In other words, sightseers shouldn't seize seashells by the seashore.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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