



Male crickets typically make quite a racket.
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Their wings have () file and scraper () move the file across the scraper ensuing songs lets females know that the males will be happy to see them.
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7 u8 T* E2 F7 w/ \6 |! O. gBut on one who are on an island, male's song became deadly. y( j% j4 E7 A1 z5 b
8 b; x& e# D2 aa parasitic fly track down the males from the song and kill them.. f$ o7 Z, z- v1 p+ T$ |0 L
; V+ N' G0 y( v9 \7 P/ O- k' v* HNow normally being a muton male cricket that couldn't do the wing sing was a ticket to (mating a belive in).+ m+ |* q2 r0 \) C
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But with the loud males being targeted by the parasitic flies, being a muton nude male suddenly become advantage.) S. O9 O3 u% I# ^
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Less than twenty generations ago, ninty percent of the male cricket on the island could sing, now ninty percent can't sing. Because evolution can work in a hurry if the (stake) is high enough.. `0 f$ b1 R2 S) O2 p
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The research was published in the jounal Biology Letters.
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- Z4 @4 p# p$ m" V5 f- G, @So how do the (salon) males attract mates?
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With a very clever new behavior, they (appear) a cluster around one of the remaining minority of males who still sings, and mingle with the many interested females who show up to hear the lone male.+ `# C$ }9 J$ ^, I
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It likes being a friend of ()* ], T8 m: @* g& h
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折腾了一个多小时,还是有好多都没听出来呀,差距真是大呀。
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强烈建议3天一个周期
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% y5 f+ Q6 a4 t% l7 V G/ B[ 本帖最后由 ycroco 于 2007-8-29 18:25 编辑 ]