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 postulated that this situation can occur if each participant has a locally minimum value for a quantity denoted R-star. This situation is represented on a phase plane by a stable equilibrium point that is the intersection of two zero-growth (-5[1])isoclines. The unusually large number of different (*) phytoplankton species (10[1])that are in this situation together (10[1])is called the “paradox of the plankton.” According to Gregory Gause's law of competitive exclusion, this situation cannot occur for two species competing for the same niche. For 10 points, name this situation in which multiple species survive in the same environment. ■END■ (0[1])