Sept 23, 2011 chapter 4: species interactions and community ecology. Arrived in 1988 european ships discharged water into lake st. clair, canada. Within 2 years they showed up in all 5 great lakes. They spread rapidly and are an invasive species. Hundreds of millions of dollars of damage to property. Competition = multiple organisms seek the same limited resources intraspecific competition vs. interspecific competition inter : 2 diff species interacting intra: 2 of the same species. Species divide shared resources by specializing in different ways ie) the lions will kill the zebra and eat what they want hyenas and vultures wait and eat whatever if left. Character displacement = characteristics diverge to lessen competition and to eat different things if birds live on the same island they have a larger variety of beak sizes. One is getting a benefit and one isn"t. Predation = individuals of one species capture, kill, and consume individuals of another species.