BSC 2011 Lecture Notes - Lecture 32: Interspecific Competition, Intraspecific Competition, Competitive Exclusion Principle
8 Apr 2015
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Bsc2011 - integrated principles of biology 2 - lecture 32: species interactions. Interactions between species may be positive, negative, or neutral. Interspecific interactions affect population dynamics and species distributions. Interactions affect individual fitness and can result in evolution. Species are embedded in complex interaction webs. Intraspecific among individuals of the same species. Interspecific among individuals of different species. Interactions influence population densities, alter species distributions, and lead to evolutionary change. For an otter, interactions with sea urchins (a food source) is positive. For sea urchins, interactions with an otter (a predator) is negative. Competition is the use or defense of a resource by an individual that decreases the resource availability to others. Resources include food, water, nutrients, and space. Any factor consumed by an organism and supports increased population growth rates is a resource. Resources will be allocated for maintenance, growth, defense, and reproduction. Usually occurs over a limiting factor, where competition for a single resource is most intense.
