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Lecture9_Populations10

Lecture9_Populations10 - ECOLOGY Dr Krystal Rypien...

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ECOLOGY Dr. Krystal Rypien [email protected] Office Hours: T/Th 9:45-10:45AM, York 3010 **Oct 29- Nov 17 only** By appointment, SIO campus Completing the assignments on time is critical for success! Be sure to pick up a mini-syllabus for this section of the course Where are we in BILD 3? Behavioral Ecology Evolution: Natural Selection & Speciation Ecology: Populations & Communities Ecosystems Humans: Conservation & Biodiversity Exam grades posted on 11/2 What is Ecology? A. A descriptive branch of science, focused mainly on observing nature B. Another word for environmentalism C. An interdisciplinary branch of science, combining evolution, physiology, chemistry, and geology CQ Ecology: study of the interactions between organisms and the environment Populations -- Communities -- Ecosystems How do we measure and describe populations? Objectives 1. Describe different ways we measure populations 2. Identify the scale and distribution of populations 3. Use demographic data to describe a population 4. Construct and interpret life tables and survivorship curves 5. Apply demographic data to management decisions
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What is a population? Group of organisms of the same species Occupy a particular space at the same time Is the definition of a population fixed? Describing a Population 1. Density 2. Dispersion 3. Demography 4. Dynamics 1. Density What is density? - In physics, mass per volume - Individuals per unit What is population density ? - Number of organisms per area Measuring a Population Population ecologists take 3 approaches - Census - Proxy - Sampling
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Measuring a Population Census - Count every individual - Organisms must be easy to observe , not too numerous, and occur in an easily defined area Examples: Problems?
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