Chapter 53 COMMUNITY ECOLOGY

Chapter 53 COMMUNITY ECOLOGY - CHAPTER53COMMUNITY ECOLOGY

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CHAPTER 53 COMMUNITY  ECOLOGY Species to species interactions
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COMMUNITIES Without the interference of other species,  populations tend to regulate themselves.  Some  thrive some become extinct depending on their  ability to adapt – long term. Species rarely live in areas where there are no  other species.  Instead they coexist with other  species.
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COMMUNITIES Community  - all of the species that interact with  one another in a defined area. Species interactions Determine the distribution and abundance of one  another. Promote natural selection and coevolution. Outcomes are dynamic and conditional.
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COMMUNTIES How do species interact?  (benefit = +, harm = -  and no effect = 0) Competition -/- Consumption +/- Commensalism +/0 Mutualism +/+
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COMPETITION Definition:  Different individuals use the  same limited supply of resources. Fuels natural selection - improvement of  “fitness” (the ability to produce fertile  offspring). Competition may be between individuals  of the same species (= intraspecific ) or  different species (= interspecific ). Types of competition, fig 53.2.
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COMPETITION Niche environmental conditions that support a certain  species. Fundamental niche  – total possible range. Realized niche  – actual range occupied.  Niches are  restricted by density of species, predators and  competitors.
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When the niches of 2 species completely overlap  1  of 2 things happens, fig 53.4: Asymmetric competition :  one species uses more  resources than the other.  Fitness in both species  declines but it is more significant in one species. Symmetric competition
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 53 COMMUNITY ECOLOGY - CHAPTER53COMMUNITY ECOLOGY

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