LIFESCI 7B Chapter Notes - Chapter 9: Ecological Niche, Competitive Exclusion Principle, Lignin
4 Sep 2018
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Document Summary
Niche: a species" physical habitat and its ecological role in that habitat. Determined by biotic (biological) and abiotic (physical) factors. Niche"s re ect where organisms occur and what they do there. The ways organisms respond to and affect resources/other species in the habitat. Realized niche is more restricted than fundamental niche. Fundamental niche includes the full range of climates and food resources that permits the individuals in a species to live. Realized niche: actual range of habitats occupied by a species. More restricted bc takes into account how interactions with other species (like competition/other biotic factors) may reduce the range. Phylogenetic niche conservatism: observed similarity in closely related species of some aspect of their niches, indicating its presence in their common ancestor. Some aspect of the niches of closely related species is similar, and are evolutionary conserved. All interactions combine costs (usually resources) and bene ts (increases in reproduction)
