Without predation on either predator or prey both range over entire habitat 4: When largemouth bass (which prey on small bluegill sunfish are present, many sunfish take prey form vegetation habitat where they are relatively protected from predation. 4: Bluegill (predator) vs invertebrate prey.įig. Size and spatial escapes – barnacles (prey) vs snail (predator)įig. Predators disperse, prey re-establish by migration of larvae. 3: Example for 2) dispersal and immigration (Left: Prey population Right: Predator Population)įig. 2: Huffaker’s 1958 "hide and seek" experiment with mite and mite predator. Coexistence possible when, in addition to heterogeneity, temporary barriers to predator migration are established.įig.With predatory mite added both prey and predator go extinct, despite heterogenous habitat.In the absence of predators, the herbivorous mite population flucuates through time but persists.Huffaker’s 1958 "hide and seek" experiment with mite and mite predator. Without a refuge, but with periodic immigration, predator and prey can coexist With a refuge for the prey, the predator goes extinct Without refuge in closed system ® prey go extinct, obviously not evolved under these conditions – natural systems are "open" Size escapes (either young are too small or adults too large for predators to consume).Įxamples: Refuge for prey - Gause’s experiments using protozoan, Paramecium (prey) and Didinium (predator).Predator/Prey interactions continued (factors leading to coexistence) Lecture 16: Predator/Prey Cycles – Community Ecology
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