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F13 lecture 10

# 1nt this is known sta7s7callymathema7cally as the

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Unformatted text preview: t males undertake all the ma?ngs •  males that do not mate = zero ﬁtness •  => high variance in male reproduc7ve success (ﬁtness) •  some variance in reproduc7ve success, especially in males, is very common •  with variance data: •  Ne = [8Na]/[Vm + Vf + 4] •  Vm = variance in number of oﬀspring produced by males •  Vf = variance in number of oﬀspring produced by females example from the book II •  red deer (Cervus elaphus) –  life7me reproduc7ve success –  Vm = 41.9, Nm = 33 –  Vf = 9.1, Nf = 35 –  Ne = [8*(33+35)]/[41.9+9.1+4] –  Ne = 9.9 –  a huge reduc7on compared to Na = 33+35 = 68 [email protected]://www.hlasek.com/foto/cervus_elaphus_e5910.jpg refesher (?): Variance •  The average of the squared diﬀerences from the Mean. •  use VAR(array) func7on in MS Excel –  for small sample sizes, divide by n- 1 instead of n male # # oﬀspring devia?on devia?on squared 1 21 3.3 10.89 2 34 16.3 265.69 3 7 - 10.7 114.49 4...
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