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Understanding Biotic and Abiotic Factors in Ecosystems

Explore the differences between living and non-living entities in ecosystems, identify characteristics of living organisms, and learn how biotic and abiotic factors interact. Discover why organisms are considered alive. Understand how changes in factors impact ecosystems. 8

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Understanding Biotic and Abiotic Factors in Ecosystems

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  1. WarmUP 1/21 page 156 What does the prefix Bio mean?

  2. Organisms and the Environment Page 157

  3. develop a strategy to separate the different aspects of this environment into 2 different categories Pg.158

  4. Pg.158 Living and Non-Living

  5. Pg.158

  6. Pg. 159 BIOTIC ABIOTIC

  7. Warm-Up • IN YOUR NOTEBOOK! • Write the question & your answer What is the difference between something that is living and something that is non-living?

  8. Characteristics of Living Things

  9. Pg. 160 Characteristics of Living Organisms

  10. All things considered to be alive have what characteristics in common? • Make a list of reasons why you think the following organisms are considered “alive”.

  11. Characteristics of Living Things • Made of Cells unicellular vs.. multicellular Red Blood cells Onion skin epidermal cells Human cheek cells

  12. Characteristics of Living Things 2. Grows and develops • Increase in cell size and/or number • Includes: development, aging, death • Differentiation – cell specialization for a certain job

  13. Characteristics of Living Things 3. Obtains & uses Energy • Metabolism (sum of all chemical reactions) • Heterotroph (other feeding) vs. autotroph (self-feeding)

  14. Characteristics of Living Things 4. Reproduces two kinds of reproduction: - asexual – takes one to make more - sexual – takes two

  15. Characteristics of Living Things 5. Responds to the Environment a. Movement – internal or external b. Irritability - ability to respond to a stimulus Examples of stimuli : sight, sound, touch, pressure, temperature, chemicals, color, light, other? c. Adaptability

  16. Characteristics of Living Things 6. Ability to adapt (Evolution) • Evolution - gradual change in a populationof organisms over time • Individuals DO NOT evolve

  17. Biotic vs. Abiotic Page 161

  18. Ecosystem: made up of biotic and abiotic factors interacting with each other.

  19. Biotic Factors • the living things in the ecosystem. • Examples: Plants, animals, fungi, protistsand bacteria

  20. Abiotic Factors • not alive, nonliving factors that affect living organisms.   • Examples: • temperature, soil, light, aspect, atmospheric gases present, sunlight, wind, wind patterns, precipitation, habitat, season, cloud cover, altitude and location of the ecosystem.

  21. Biotic and abiotic factors are interrelated.

  22. Abiotic factors don’t need biotic factors but Biotic factors cannot exist without the abiotic factors.

  23. Biotic Factors • From the tiniest bacteria to the largest mammal, all need abiotic factors in order to survive. • They need air to breath and light to photosynthesize, for example.

  24. Abiotic Factors • The seasons, cloud cover, altitude and aspect and location of the ecosystem will determine how much sunlight plants receive and therefore will govern photosynthesis.

  25. The Impact of Changing Factors • If a single factor is changed, perhaps by pollution or natural phenomenon, the whole system could be altered. For example, humans can alter environments through farming or irrigating. While we usually cannot see what we are doing to various ecosystems, the impact is being felt all over. For example, acid rain in certain regions has resulted in the decline of fish population.

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