Biology 2483A Lecture 18: 18-Species Diversity in Communities.docx
2 Jan 2015
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If one species goes away, the other won"t suffer as much. Want a community that persist overtime requires redundancy. If only had 1 species, would drastically change community. Aesthetics like to look at many different species. Ethical reasons not our right to exterminate species through our own actions. Distribution and abundance of species in communities depends on: regional species pools and dispersal ability, abiotic conditions (tolerance, species interactions. These factors act as filters, which exclude species from (or include species in) particular communities. Humans have greatly expanded regional species pools by serving as vectors of dispersal. Many species that are dispersed in ballast water can"t survive in a new habitat because of temperature, salinity, etc. But we can"t rely on physiological constraints to exclude invaders, as in the case of caulerpa in the. Some non-native species do not become part of the new community.
