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What is the Survival of Adélie Penguins due to Climate Change: A Study on Population Dynamics

What is the Survival of Adélie Penguins due to Climate Change: A Study on Population Dynamics. By: Jessica Caton. Introduction to Population Ecology. What is a population? A group of individuals of a single species inhabiting a specific area (Molles 2010, p. 202)

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What is the Survival of Adélie Penguins due to Climate Change: A Study on Population Dynamics

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  1. What is the Survival of Adélie Penguins due to Climate Change: A Study on Population Dynamics By: Jessica Caton

  2. Introduction to Population Ecology • What is a population? • A group of individuals of a single species inhabiting a specific area (Molles 2010, p. 202) • Size range from centimeters to millions of square kilometers

  3. Population Dynamics An area of population ecology concerned with the factors influencing the expansion, decline, or maintenance of populations (Molles 2010, p. 222) Why study population dynamics? • Saving endangered species • Controlling invasive species • Maintaining important populations • Growth of human population

  4. Antarctic Species of Interest:Adélie Penguin (Pygoscelis adeliae) • Physical appearance: • Medium-sized (2 feet tall), black and white • Angular head and tiny bill • White eyering • Longest feather on body is the tail • Smallest penguin in Antarctica • One of the pack ice Antarctic penguins • Most numerous bird in Antarctica

  5. Adélie Penguins and Climate Change • One of the best studied birds • Changing population of species: numbers dropped a third • Sea-ice decline, Adélie penguin populations decline • Evolution of environmental instability?

  6. Life Tables A table that uses age specific information to estimate important population dynamic traits on a population

  7. Types of Life Tables • Cohort Life Tables (horizontal) • Static Life Tables (vertical) After reviewing both concepts click HERE

  8. Cohort Life Table Time Cohort (horizontal) • A table based on individuals born at the same time (Molles 2010, p. 230)

  9. Static Life Table Time Static (vertical) • A life table constructed by recording the age at death of a large number of individuals • A snapshot of survival within a population during a short interval of time • (Molles 2010, p. 231)

  10. Data Collection for Life Table

  11. T

  12. Calculations Variables • X = Age • N = Population size • B = Birth rate • l = Survivorship • m = Average offspring • T= generation time • r = per capita rate of increase • R0 = Net reproductive rate

  13. Interpreting • Age structure = NX • Generation time = T (am I in your generation) • Per capita rate of increase = r (-, 0, +) • Net reproductive rate = R0 (0, <1, >1)

  14. Survival and Mortality in a Population of Adélie Penguins(Ainley & DeMaster 1980)

  15. Survivorship Curve • A graphical summary of patterns of survival in a population (Molles 2010, p. 231) • Three types: • Type 1 = High mortality in older individuals • Type 2 =Constant mortality rate • Type 3 =High mortality in juveniles

  16. Type 1 Survivorship Curve Home

  17. Type 2 Survivorship Curve Home

  18. Type 3 Survivorship Curve Home

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