段落1
This is Scientific American 60-Second Science. I'm Christopher Intagliata.Got a minute?
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Island View Beach, in British Columbia, has all the makings of a perfect summer outing: great views, seclusion, sand dunes and driftwood.
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There's just one minor detail: That driftwood?
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It hosts two to three black widow spider webs per square meter.
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"To some people a beach full of black widows sounds like a nightmare, but to me it's awesome and it's not scary at all."
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Catherine Scott studies spider behavior at Simon Fraser University in British Columbia.
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And in case you're wondering: "I've never been bitten by a black widow and I'm not at all concerned about being bitten by a black widow."
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Scott's research brought her to Island View Beach, to study the mating habits of black widow spiders.
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The basics are this: "If you're a male black widow your goal in life is to find a female and mate with her and father as many of her offspring as possible."
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Achieving that goal includes some architectural alterations by the males during their several hours of courtship,
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they snip the female's web to pieces, and then bundle the tattered web in their own silk.
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Scott and her colleagues found that webs treated this way don't attract other prowling males the same way an intact web does.
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Meaning "it's not so much the best male, but the first male to arrive that will win, if he's able to quickly find a female and reduce her web."
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And the reason this tactic works?
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The researchers say females encode pheromones, like chemical "personal ads," in their webs, advertising their age, hunger level and mating status.
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And the first-arriving male's craftsmanship may obscure that information, causing other suitors to pass her by.
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The study is in the journal Animal Behaviour.
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Wondering about the post-coital fate of the males?
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Scott says it's a common misconception that black widows always feast on their mates.
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Males can and do mate with multiple females.
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And besides, black widow females advertise right on their webs how hungry they are.
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So let no male claim that his desire caused him to lose his head.
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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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1 / 23
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显示原文 =This is Scientific American 60-Second Science. I'm Christopher Intagliata.Got a minute?
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2 / 23
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显示原文 =Island View Beach, in British Columbia, has all the makings of a perfect summer outing: great views, seclusion, sand dunes and driftwood.
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3 / 23
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显示原文 =There's just one minor detail: That driftwood?
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4 / 23
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显示原文 =It hosts two to three black widow spider webs per square meter.
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5 / 23
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显示原文 ="To some people a beach full of black widows sounds like a nightmare, but to me it's awesome and it's not scary at all."
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6 / 23
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显示原文 =Catherine Scott studies spider behavior at Simon Fraser University in British Columbia.
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7 / 23
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显示原文 =And in case you're wondering: "I've never been bitten by a black widow and I'm not at all concerned about being bitten by a black widow."
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8 / 23
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显示原文 =Scott's research brought her to Island View Beach, to study the mating habits of black widow spiders.
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9 / 23
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显示原文 =The basics are this: "If you're a male black widow your goal in life is to find a female and mate with her and father as many of her offspring as possible."
点击显示原文 = -
10 / 23
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显示原文 =Achieving that goal includes some architectural alterations by the males during their several hours of courtship,
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11 / 23
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显示原文 =they snip the female's web to pieces, and then bundle the tattered web in their own silk.
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12 / 23
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显示原文 =Scott and her colleagues found that webs treated this way don't attract other prowling males the same way an intact web does.
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13 / 23
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显示原文 =Meaning "it's not so much the best male, but the first male to arrive that will win, if he's able to quickly find a female and reduce her web."
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14 / 23
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显示原文 =And the reason this tactic works?
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15 / 23
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显示原文 =The researchers say females encode pheromones, like chemical "personal ads," in their webs, advertising their age, hunger level and mating status.
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16 / 23
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显示原文 =And the first-arriving male's craftsmanship may obscure that information, causing other suitors to pass her by.
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17 / 23
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显示原文 =The study is in the journal Animal Behaviour.
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18 / 23
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显示原文 =Wondering about the post-coital fate of the males?
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19 / 23
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显示原文 =Scott says it's a common misconception that black widows always feast on their mates.
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20 / 23
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显示原文 =Males can and do mate with multiple females.
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21 / 23
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显示原文 =And besides, black widow females advertise right on their webs how hungry they are.
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22 / 23
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显示原文 =So let no male claim that his desire caused him to lose his head.
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23 / 23
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞