BIOL 1500 Lecture Notes - Lecture 19: Competitive Exclusion Principle, Keystone Species, Demodex
6 Oct 2016
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Document Summary
A niche includes all of the resources required for survival, growth, and reproduction. A habitat is part of a niche. The niche includes interactions with other organisms (biotic) and abiotic factors such as light, temperature, and chemicals. Biomes are ecosystems with distinctive communities of life. Differences in light, temperature, and moisture vary across the biosphere. Temperature and moisture are the main factors that determine the dominant plant in each location. The vegetation influences which other organisms can live in each area. Aquatic biomes, including freshwater and marine biomes, occupy more space than terrestrial biomes. Water moves continuously between sea and land, and provides a vital connection among all biomes. Species interactions have varying effects on the reproductive success of the participants. Commensalism harms one and does not affect the other. Ex. demodex (microscopic arachnid that lives in hair follicles and consumes dead skin cells and oil secretion)
