Swirling a vortex
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This document discusses using computer modeling and simulations to study how animal populations change over time and the factors that influence these changes. It introduces the Vortex software, developed by the IUCN, which allows users to input parameters like population size, breeding rates, mortality rates, and offspring numbers to model population dynamics. The document provides examples of how different population scenarios would be classified under the IUCN Red List categories, such as Endangered or Critically Endangered. It also describes how students will work in small groups using the Vortex software to run simulations, experiment with changing parameters, and observe their effects on modeled animal populations.
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This document discusses key concepts in population ecology, including:
- Population is defined as all individuals of a species living in an area. Demography is the statistical study of populations.
- Population size, density, distribution, and changes over time are important to study. Populations can experience exponential or logistic growth depending on available resources.
- Survivorship curves (Type I, II, III) describe mortality patterns. Reproductive strategies also influence population growth.
- Human population growth has increased due to improved health and technology, though uncontrolled growth risks environmental damage.
Sampling Method
This document provides instructions for students to conduct labs on estimating plant and animal population densities using various methods. For the plant population lab, students will use a quadrat method to sample plant populations and calculate density and frequency. They will record data on number of individuals and presence/absence in quadrats for multiple species. For the animal population lab, students will use a mark-recapture technique to estimate population size of objects like beans by capturing, marking, and recapturing samples. They will record data to calculate a scientific estimate and percent error compared to the actual population.
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Swirling a vortex
- 1. Swirling a Vortex of Numbers to see animal populations’ futures David Thompson (Bayard Middle School) & Diana Cheng (Towson University) http://tinyurl.com/p673fr7
- 2. Common Core State Standards for Mathematical Practice • Modeling with Mathematics: how the biological phenomenon of population change can be modeled graphically – Experiment which mimics species’ changes in population – Hypothesize & test ways to increase the population by changing relevant parameters • Using appropriate tools strategically: Computer software & spreadsheets, graphing calculators
- 3. Total # of Species & Threatened Species Source: IUCN Red List
- 4. Quantities considered for classifications % population reduction in 10 years Mature population size Reduction in geographic range
- 6. IUCN Red List Categories (2001)
- 7. Criteria for Threatened Levels (IUCN, 2001)
- 8. Table 1: IUCN Classifications Examine Table 1 and answer the following questions regarding classifications of species’ threatened levels: • a. An animal’s population table is presented below. How should this species be classified? Year Population size 2000 1000 2010 700 • b. Suppose an animal’s population is 750 mature individuals and there is a 50% population reduction over a 10 year period. How would this species be classified? • c. Provide a scenario in which an animal’s population is increasing, yet the species is still classified as endangered (EN).
- 9. A Technology-Enhanced Experiment Vortex 10 software – Developed by the IUCN Conservation Breeding Specialist Group & the Chicago Zoological Society – Provided at no cost – http://vortex10.org/Vo rtex10.aspx • Some parameters: – Initial population size – Carrying capacity – % of adult females / males breeding – Mortality rates – # of offspring per female
- 10. Small Group Work dthomp9@students.towson.edu • Exploration A – A1 & A2 – A3 & A4 • Exploration B – B1 & B2 – B3 & B4