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Lecture

Ecosystem effects.pdf

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Department
Biology
Course
BIOL 1070
Professor
Shoshanah Jacobs
Semester
Winter

Description
February-07-14 1:17 PM Abiotic Variables: Non-living factors that affect organism abilityto surviveand reproduce. Includes temperature, chemical products, water, atmosphere and light. • LIGHT is an important abiotic variablein a forest ecosystem as it is the main supply of energyfor organisms.Plants convert light energyinto chemical energyin photosynthesis which is then stored as biomass. Plants adapt to high or low light conditions, with shade tolerant plants dominating the understory of forest canopies. • LIGHT also regulatesrhythms of species. Plants use a protein to sense season changes whileinsects use lightsto differentiateflowers when harvesting nectar (pollinationof plants). Niche: Environmental space which isthe space that an organism occupies confined by the environmental variablesthe species responds to. Ecological niche isdefined as a set of biotic an abiotic conditions where a species is able to maintainpopulation sizes. • FundamentalNiche: All the possible dimensionsin which a species can survivein principle. • Realized Niche: The dimensionsin which a speciesactually survivesafter the effects of biotic interactions. Niche construction isa feedback mechanism of natural selection. Habitat: The environment a species occurs in. A habitat includes all characteristics of an en
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