For each hotspot, calculate the number of species that will remain, S*, after sp

Question

For each hotspot, calculate the number of species that will remain, S*, after species richness comes to an equilibrium for the current area of mostly natural vegetation remaining. Z of 0.14 used. A suggestion: In the calculations below, use proportions of total area rather than actual square kilometers for your species- area curve calculations. This allows us to assume a constant e value for each hotspot across several scenarios as c is our y-intercept and we change the scale such that our known value of s is at area 1 (%100) we assume that our different scenarios don't change the original species diversity of the full hotspot, eg S at area = 1 (100%). Therefore, we want the various scenarios within each hotspot to produce lines that all converge at area 100%. Because maximum area equals 1.0 and log(1) zero, our intercept is on the right in a log-log graph. Note, this purely for convenience; you could come up with the same answers using actual square kilometer values, but then you will need to calculate a different c for each scenario by assuming that the lines cross at the full area -it is easier to use proportional area. You should get the same answers ether way but I recommend calculating everything using proportional area. Area with conservation potential (km2) Total area (km2) Area remaining (km2) Percent of total area Hotspot Plant species protected Australia Californias Chile Med. Basin South Africa 802,523 176,425 148,408 2,077,131 96,953 8,000 4,300 2,400 25,000 8,550 508,792 (63%) 110,399 (68%) 112,232 (76%) 422,010 (53%) 84,444(48%) 110,861 (75%) 1,376,444(66%) 54,051 (56%) 11% 10% 1% 4% 19% 1,453,855(70%) 72,838 (75%)

Explanation / Answer

Formula is logs =logc +z log A

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