BIOL 122 Lecture Notes - Lecture 23: Santa Barbara City College, Canada Lynx, Herbivore
Document Summary
Both predators and herbivores can limit population growth. Prey and predator populations demonstrate cyclic fluctuations. Lack of food for the prey does not cause cycling. Gave the hares extra food still cycled. Excluded lynx with fences still cycled. High densities of predators cause increased stress. Predation is clearly defined as an interaction where a predator consumes a prey. Herbivory is similar to predation except that: item. By consuming a portion of the plant, the herbivore doesn"t necessarily kill the whole plant. The plant can regrow the eaten part. Both predators and herbivores have direct impacts on the population sizes of their prey. Lizards and spiders on islands in the caribbean. Small islands usually had spiders, not lizards. Larger islands usually had lizards, not spiders. Introduced spiders only survived on islands without lizards. Introduced species can cause extinction among local species, especially on islands. Guam: brown tree snakes bats, birds, lizards decline. Snakes were accidentally introduced and have dramatically.
