Peter Chesson classified mechanisms for creating this situation as either dependent or independent of spatial variation, with the storage effect exemplifying a dependent mechanism. David Tilman (15[1])postulated that this situation can occur if each participant has a locally minimum value for a quantity denoted R-star. (15[1])This situation is represented on a (-5[1])phase plane (-5[1])by a stable equilibrium point that is the intersection (15[1])of two zero-growth (-5[1])isoclines. (15[1])The unusually large number of different (*) phytoplankton species (10[1])that are in this situation together (10[1]-5[1])is called the “paradox of the plankton.” (-5[2])According to Gregory Gause's (-5[1])law of competitive (10[1]-5[1])exclusion, (-5[1])this situation cannot occur for two species (10[1])competing (10[1]-5[1])for the same niche. (-5[1])For 10 points, (10[1])name this situation (10[1])in which multiple species survive in the same environment. ■END■ (10[8]0[6])