BIOL 1001 Chapter : Chapter 27
Document Summary
Community interactions: community- all the interacting populations within a ecosystem, a community encompasses the entire biotic portion of the ecosystem, the most important community interactions include, competitions, predation, parasitism, mutualism. Overlap between ecological niches causes competition: competitive exclusion principle, mo two species can inhabit exactly the same ecological niche for an extended amount of time, one will outcompete the other, ex. Two species of paramecium: resource partitioning, when species with similar ecological niches coexist and compete they tend to occupy a smaller niche, serves to minimize competition, ex. Each species of warbler hunts for insects in slightly different areas of the spruce tree. Interspecific competition: can reduce population size and distribution, ex. Two types of barnacle both like in the intertidal zone but due to interspecific competition they are found in different areas. Intraspecific competition: major factor in controlling population size, density-dependent environmental resistance.
