Ch 52 Notes - pg 1023-1038 Community Ecology Chpter 52...

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pg 1023-1038 Community Ecology Chpter 52 community -consists of an association of populations of different species that live and interact in the same place at the same time; (broad because refers to various categories of sizes and levels of interactions) community structure/functioning - are properties of communities that populations lack; includes the number and types of species present, the relative abundance of each species, the interactions among different species, community resilience to disturbances, energy and nutrient flow throughout the community, and productivity community ecology - is the description and analysis of patterns and processes within the community resource -is anything from the environment that meets needs of a particular species facilitation -species interacting in positive ways which modifies and enhances the environment for other species ecosystem -a biological community and its abiotic environment; consists of all the interactions between the living world and the physical environment COMMUNITY STRUCTURE AND FUNCTIONING 1. define ecological niche. distinguish between an organism’s fundamental miche and its realized niche, and give several examples of limiting resources that might affect an organism’s ecological niche 2. define competition, and distinguish between interspecific and intraspecific competition 3. summarize the concepts of the competitive exclusion principle, resource partitioning, and character displacement 4. define predation, and describe the effects of natural selection on predator-prey relationships 5. distinguish among mutualism, commensalisms, and parasitism, and gives examples of each 6. distinguish between keystone species and dominant species *populations of a community interact with and affect one another in complex ways that are not always obvious pg 1024 for diagram *three main types of interactions in community: competition, predation, symbiosis The niche is a species’ ecological role in the community ecological niche -every species is thought to have its own ecological role within the structure and function of a community; takes into account all biotic and abiotic aspects of the species’ existence, that is, all physical, chemical, and biological factors that the species needs to survive -nich also encompasses what a species eats, what eats it, and what organisms it competes with and how it interacts with and is influenced by -niche represents the totality of adaptations by a species to its environment, its use of resources, and the lifestyle to which it is suited
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Ch 52 Notes - pg 1023-1038 Community Ecology Chpter 52...

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