Round 9: Tossup 16

A hypothesis for how herbivores and pathogens affect levels of this quantity in forests was proposed by Janzen and Connell. A measure of this quantity is given by [read slowly] “one minus the sum of little n times little n minus one, over big N times big N minus one.” Measures for this quantity (10[1])named for Simpson (10[1])and (10[1])Shannon consider (10[2])both evenness and richness. (10[2])A “latitudinal gradient” describes how this biological (10[1])quantity increases (10[1])near the tropics. Regions with (10[1])high (10[1])values for this (10[1])quantity that are threatened by human habitation are known as its “hotspots” (10[1])and include the Amazon Rainforest. For 10 points, name this quantity that measures the variability of species in a region. ■END■

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