BIOL 302 Lecture Notes - Interspecific Competition, Snowshoe Hare, Cyclamen
2 Feb 2013
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Outline: 5 kinds of consumer-resource exploitation: herbivores, carnivores, parasites, parasitoids and cannibals, impacts of predators on prey. Limiting prey pop (mites, skunks and sea lampreys) Carnivores: kill and consume prey, remove from population. Parasites: consume live host, but don"t remove. Parasitoids: lay eggs on host, host consumed and removed. Herbivores: may act as predators (kill fruits/seeds) but more often browse plants without killing. Cannibals: predator and prey are same species (rare, often special circumstances associated with sexual selection) *exploitation: interaction between populations that enhances fitness of one individual while reducing fitness of the exploited individual. Predators can control prey populations: strawberry plots infested by cyclamen mites. Invading sea lampreys and great lakes sea trout: invasion of sea lampreys in 1930 resulted in collapse of the sea trout population. Both field and lab studies show predators may: Fluctuate in coupled oscillations with their prey. Produce non-consumptive effects in their prey ( the ecology of fear )
