Slide Set XIV ecoSHORT Spr11

Slide Set XIV ecoSHORT Spr11 - Unit IV Ecology The study of...

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Ecology Unit IV The study of the interactions between organisms and their environment .
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I. Ecology A. Factors affecting distribution and abundance of a species 1. Abiotic 2. Biotic B. Hierarchy of ecological study II. Population ecology A. Why study population ecology B. Properties of populations 1. Size, density, dispersion, sex ratio, age structure 2. Energy allocation and tradeoffs 3. Life history 4. Survivorship curves ECOLOGY: Slide Set XIV
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II. Population ecology C. Population dynamics 1. Factors affecting population size 2. Models of population growth a. exponential population growth i. pattern ii. mathematical model b. logistic growth i. pattern ii. mathematical model c. examples
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8th:52.2 7th: 50.2 In ecology, one asks: what factors influence the distribution and abundance of organisms. e.g., What is causing this observed pattern?
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1. Abiotic components – nonliving chemical and physical factors 2. Biotic components - living components (= all the organisms in a particular envir.) I. ECOLOGY The study of the interactions between organisms and their environmen t. A. Influential environmental components affect distribution & abundance of organisms in the environment:
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Abiotic factors: physical: temperature humidity light wind soil/substrate structure fire topography/physical structure chemical: water oxygen pH salinity minerals, nutrients Biotic factors: predation (interactions between diff. species) competition (interactions within a species) density disease parasitism
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e.g., ask: What limits seaweed abundance? 8th: 52.8 Indicative of biotic interactions.
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1. Pop’n ecology: What factors affect population size, age structure, and distribution through space and time? Pop’n = a group of organisms of same species co-occurring in time and space. B. Different levels of complexity in ecology, but three predominant ones: (8th: 52.2; 7th: 50.3) 2. Community ecology: How do interactions between populations of different species that live in the same area affect the structure and organization of a community? Community = All the organisms inhabiting a particular area (ALL SPECIES!)
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3. Ecosystem ecology: a. What are the interactions between a biotic community in an area & its abiotic (physical) environmen t? b. How do nutrients flow through communities in an ecosystem? B. Different levels of complexity in ecology, but three predominant ones: (8th: 52.2; 7th: 50.3) An ecosystem = the biotic & abiotic components of a particular environment
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1. To better manage crop and livestock population 2. For better pest control 3. To better manage pop’ns of endangered species 4. To better understand human II. POPULATION ECOLOGY A. Concerned with the characteristics of a population, such as its growth rate (size, density), age structure , sex ratio , and how these characteristics change in response to ecological and evolutionary pressures. Why study pop’n. ecology
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Slide Set XIV ecoSHORT Spr11 - Unit IV Ecology The study of...

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