F13 lecture 10

# Ngs males that do not mate zero tness high variance

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Unformatted text preview: a (obtained by coun7ng individuals) –  if assump7on 1 (equal numbers of both sexes) is violated: –  Ne = 4(NmNf)/(Nm+Nf) •  Nm = number of males •  Nf = number of females •  Nm+Nf = Na theore7cal examples •  subpopula7on with 10 males and 10 females •  Ne = 4(10)(10)/(10+10) = 400/20 = 20 = Na •  subpopula7on with 5 males and 10 females •  (Na = 15) •  Ne = 4(5)(10)/(5+10) = 400/15 = 13.3 example from the book I •  ﬁg wasps –  females lay eggs inside ﬁgs –  sex ra7os are usually strongly female- biased •  in a survey of 12 ﬁgs –  eggs from 5 diﬀerent females –  average # wasps emerging per ﬁg = 240 •  = average Na for each ﬁg –  overall sex ra7o 23% male •  average Ne calcula7on •  Ne = [(4*(240*0.23)*(240)*0.77]/240 •  Ne = 170 [email protected]://www.dimijianimages.com/More- page5- mutualisms/ﬁg- wasps.jpg in many species – a few dominan...
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