BISC 313 Lecture Notes - Lecture 14: Intermediate Disturbance Hypothesis, Competitive Exclusion Principle, Eutrophication
7 Nov 2017
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Document Summary
Community functions often provide ecosystem services, such as: production of food and water, water filtration and nutrient/waste cycling, flood control, pollination, fisheries, global population projections. Least developed countries by 1 billion: would require 1. 3 billion hectares of new crop land and about 0. 5 billion hectares of pasture land for meat production. Species diversity differs among communities due to variation in regional species pools, abiotic conditions, and species interactions: why do species occur when and where they do, membership in a community depends on; These factors act as filters which exclude or include species in particular communities. The regional species pool provides an upper limit on the number and types of species that can be present in a community. The importance of dispersal can be seen in cases of non-native species invasions. Brown tree snakes in guam: brown tree snakes traveled into guam in the undercarriage of planes.
