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Rarefraction homework

Rarefraction homework - notice that the number of fish...

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Amanda Diaz 1846048 NTRES 3220 1) Species N n Ni N-Ni n N n Fraction 1-Fraction C 132 25 33 1.81889E+2 3 5.87784E+2 6 0.000309449 0.999690551 D 132 25 32 2.42519E+2 3 5.87784E+2 6 0.000412599 0.999587401 E 132 25 34 1.35958E+2 3 5.87784E+2 6 0.000231306 0.999768694 F 132 25 33 1.81889E+2 3 5.87784E+2 6 0.000309449 0.999690551 3.998737197 Table : Central America Table : Argentina Species N n Ni N-Ni n N n Fraction 1-Fraction G 106 25 42 4.01039E+1 7 1.27477E+2 4 3.14596E-07 0.999999685 H 106 25 23 1.08215E+2 1 1.27477E+2 4 0.000848897 0.999151103 I 106 25 16 1.16134E+2 2 1.27477E+2 4 0.009110188 0.990889812 J 106 25 14 2.19872E+2 2 1.27477E+2 4 0.017247964 0.982752036 K 106 25 6 2.42519E+2 3 1.27477E+2 4 0.190245215 0.809754785 L 106 25 5 3.22295E+2 3 1.27477E+2 4 0.252825878 0.747174122 5.529721543 2) The rarified value for Central America is very close to the number of species in the larger sample due to the higher chance of capturing the four species present. If you look at Table 1, column Ni, you will

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Unformatted text preview: notice that the number of fish caught within each species is relatively high and fluctuate by only one and two increments. Given this information, we know that even if the sample size were 25 we would still catch the species’ of fish in about the same proportions, since no species is rarer than the other. 3) The rarified sample for Argentina is smaller than the number of species in the larger sample because unlike Central America, Argentina does have two species of fish which are rarer than the others (See Table 2, column Ni). The last two species, K and L, and possibly even I and J, will be less likely to be captured when the sample size is shrunken to 25 fish....
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