EARTH122 Lecture Notes - Lecture 5: Soil Life, Temperate Rainforest, Permafrost
12 May 2016
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Document Summary
In 1988 european ships discharged water into lake st. clair, canada. And within 2 years, the mussels invaded all 5 great lakes. This is because there were no natural predators, competitors or parasites. No means to naturally reduce numbers; will keep on spreading. Hundreds of millions of dollars damage to property. Interactions among species are the threads in the fabric of communities, holding them together and determine their nature. Ecologists have organized species interactions into several fundamental categories. Competition- the relationship where multiple organisms seek the same limited resources. Intraspeci c competition- among members of the same species. Interspeci c competition- among members of two or more species. This can lead to either competitive exclusion or to species coexistence. Resource partitioning- species divide resources by specializing in different ways. Example, one species is active during night, and the other at daytime. One species eat small seeds, the other eats large seeds.
