BIOLOGY 9 Lecture Notes - Lecture 2: East Los Angeles College, Ecotone, Biome
Document Summary
Ecosystem: an interactive complex of communities and the abiotic environment affecting them within an area. Ecosystems lack distinct boundaries and are not isolated. Species can occupy multiple ecosystems and migrate between them. May have more or fewer species than the ecosystems. Biome: a large area of earth with the same climate and similar vegetation. For example, grasslands can be predicted by rainfall and temperature. Aquatic and wetland ecosystems are determined by depth, salinity, and permanence of water. Biosphere: one huge system formed by all living things. Organisms live in the environment with physical, chemical, and biological biotic or abiotic factors. Condition: any factor that varies in space and time but is not used up (temperature, wind, ph, salinity) A factor can be both a condition and resource. Plants use water as a resource, but pond water is a condition. Factors determine whether a species occupies an area. Different species thrive with different levels of factors.
