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Background Assignments: Ecology - Population Growth and Limiting Factors

Complete the assigned reading and choose one of four options to complete a background assignment on ecology, focusing on population growth and limiting factors. This assignment will enhance your understanding of population dynamics in an ecosystem.

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Background Assignments: Ecology - Population Growth and Limiting Factors

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  1. WHAT YOU NEED TODAY: YESTERDAY ● Writing utensil ● Composition Book WHAT TO DO: Grab your checked reading from the front desk. Look over your reading, talk with your group about any answers you weren’t sure about or questions you have. I will take questions in a few minutes. (You may need to skip a page or two if you aren’t done with your post lab), but add this Reading to your table of Contents. And put in your comp book AFTER YOUR LAB Grab a ‘Joining Your AP Class’ sheet to join AP Biology- THIS IS NOT OPTIONAL - Complete steps 1-6 - 1st period AP Bio’s join code is: QM4NYK Get the experimental data from your group. ANALYSIS AND CONCLUSION OF THIS DATA IS SOLO WORK. Get a hard copy of the post lab in Wed’s blue folder. VISIT THE CLASS CALENDAR

  2. Reading assignments will now be called ‘Background Assignments’ Choices: 1. Read chapter sections and complete guided reading questions. 2. Read chapter sections and complete sketch notes on a paper or directly in your comp book. 3. Concept Map with vocabulary and a few chapter questions. 4. Watch the assigned videos and take notes/sketch notes over the information. (Links for videos on Moodle) Cycles and Conservation Background Assignment, due Wed. 9/4 A quiz over both background assignments and class notes will also be on Thurs 9/5

  3. Choice 1: Complete the guided reading sheet as you read the chapter sections. As you read the chapter sections, answer the questions on the guided reading.

  4. Choice 2: Complete sketch notes as you read the chapter sections. • Follow the questions on the guided reading OR just make sure you read the correct chapter sections and organize your sketch notes how you chose. • Great website to help you complete sketch notes: www.jetpens.com/blog/sketchnotes-a-guide-to-visual-note-taking/pt/892

  5. Choice 3: Create concept map using assigned vocabulary from the chapter sections, plus a few assigned questions. You will take the vocabulary list for these chapter sections: click here for this assignment. 2. You will place the words in a concept map showing relationships between the words. Each word needs to have a definition in your own words. PLUSone of the following: a. Sketch b. explanation of importance to this unit of study (in this case, Ecology) c. examples d. analogy (comparison to something else) This assignment will also include several questions from the book you are expected to answer.

  6. Choice 4: Watch assigned videos and take notes/sketch notes over the information. You can take your notes directly in your composition book OR if you would like to use C-notes, click here. For this assignment, you will watch and take notes over: a. Bozeman Science- Biogeochemical Cycles b. Bozeman Science- Human Impact on Earth’s Systems c. Bozeman Science- Global Climate Change The videos won’t always be Bozeman and this choice may not always be an option for background assignments….it depends on what is out there and how well it correlates withwhat is needed to be covered.

  7. ECOLOGY population organism ecosystem biome community A group of organisms of the same species that are in the same area at the same time.

  8. How are populations structured? Organisms enter a population in one of two ways… Organisms leave a population in one of two ways…

  9. Population Density: The number of individuals per unit area in a population. Not static- changes as individuals are added or removed. Population Dispersal The pattern of spacing among individuals in a population.

  10. Population Growth Exponential Model: -Measures population increase under ideal conditions. -Increase at a constant rate, resulting in a ‘J’ shaped curve when plotted over time. -Rarely occurs in nature for long, but can be characteristic of populations introduced to new environments or rebuilding from a catastrophic event. - Studying this reveals the capability of growth and conditions in which this type of growth may occur.

  11. Population Growth Logistic Model: -Takes into account that as populations increase, resources become limited. - Each population has a carrying capacity: maximum population size that a particular environment can sustain.

  12. S-Curves

  13. Limiting factors are any biotic or abiotic factor that can determine the carrying capacity of a population in a given area. • Density-dependent • Density-independent Common Limiting Factors

  14. Density-Dependent Factors • Limiting factors that depend on population size • Density-dependent factors become limiting only when population density reaches a certain level • So as a population’s density increases, these are mechanisms that slow or stop growth by decreasing birth rates or increasing death rates. Examples: Competition for resources Predation Space Contagious disease

  15. Density-Independent Factors Examples: Natural disasters Unusual weather (drought) Human activities (damming rivers/cutting forests) • Limiting factors that affect populations regardless of their size

  16. In nature, there is a trade-off in populations between reproduction and survival.

  17. Populations based on Survivor Rates K-selected species Operates in populations living at densities near the limit imposed by their resources(carrying capacity, K)/ competition among individuals is stronger. Few offspring per pregnancy (less offspring per capita) Invest a lot in raising offspring (higher survival rates) Primates/Elephants Coconut/Brazil nut trees K-selected

  18. Populations based on Survivor Rates r-selected Operates in populations that are well below carrying capacity or individuals face little competition. These maximize ‘r’- the per capita rate of increase many offspring little parental care insects Many plants Algae bacteria r-selected

  19. Human Population Growth • About 500 years ago, the human population began growing more rapidly because of agriculture and industry. • With these advances, the human population experienced exponential growth • That growth rate is slowing….

  20. Human population is still increasing…just not as much… Dotted line is projected.

  21. This decrease in growth rate is not uniform across the globe….

  22. As countries industrialize, changes can be seen in birth and death rates.

  23. Update Your TOC, and put in the proper pages • I fashion my TOC of more ‘item #s’ than page #s…. For instance, if your Animal Behavior Lab takes up 3 pages….I consider all of those pages as ‘Page 4’ Ecology T.O.C Pg. Item Grade Date Ecology Objectives 1 8/26 2 Animal Behavior Notes 8/26 8/26 Mealworm Pre-Lab 3 Mealworm Lab 4 8/28 5 Ch. 52 Ecology Reading 8/29 6 Population Dynamics Notes 8/29

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