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Chapter 8 Summary

Key Takeaways

  • Ecology Studies Interactions Across Multiple Levels: Ecology examines how organisms interact with their environment and each other, with research conducted at four main levels: organismal, population, community, and ecosystem. Each level helps explain species survival, distribution, and environmental relationships, like how woodland caribou are affected by predators, food sources, and habitat conditions.
  • Abiotic Factors Shape Life’s Distribution: The distribution of life on Earth is heavily influenced by abiotic (non-living) factors such as solar energy, temperature, water availability, and inorganic nutrients. These factors determine where photosynthesis can occur, how organisms regulate body temperature or retain water, and the fertility of soils for plant growth.
  • Organisms Adapt in Three Main Ways to Changing Environments: To cope with environmental fluctuations (e.g., seasonal changes or extreme weather), organisms respond through:
    • Physiological responses (e.g., hibernation, acclimation)
    • Anatomical changes (e.g., thicker fur)
    • Behavioural strategies (e.g., migration or altering activity times)
  • Climate Controls Biome Formation and Distribution: Biomes are large regions defined by climate, which influences vegetation and the animals that live there. Key climate drivers include latitude, Earth’s axial tilt, air circulation patterns, proximity to water, and topography (e.g., rain shadows). These variables create predictable patterns, such as rainforests near the equator and deserts around 30° latitude.
  • Terrestrial Biomes Are Characterized by Climate, Flora, and Fauna: Each biome supports species uniquely adapted to its temperature, precipitation, and growing conditions. Major terrestrial biomes include:
    • Tropical rainforests (biodiverse, warm, wet)
    • Savannas (grasslands with seasonal drought)
    • Deserts (dry, extreme temperatures)
    • Chaparral (shrubland with fire-adapted species)
    • Temperate grasslands and forests (seasonal climates)
    • Boreal forests (cold-adapted evergreens)
    • Tundra (frozen, low productivity)
  • Human Activity and Climate Change Impact Ecosystems: Human actions—such as deforestation, urbanization, industrial development, and climate change—are significantly altering ecosystems. Examples include boreal forest carbon storage loss, tundra permafrost thawing, and habitat fragmentation, which reduce biodiversity and affect species survival.

OpenAI. (2025). ChatGPT. [Large language model]. https://chat.openai.com/chat
Prompt: Summarize the following content into six key takeaways.

Flashcards

Click on the flashcards to review key terms discussed in this chapter.

Text Description

Front of Card:

  1. Abiotic factors
  2. Acclimation
  3. Anatomical responses
  4. Atmospheric pollution
  5. Behavioural responses
  6. Biomes
  7. Biosphere
  8. Biotic factors
  9. Carbon balance
  10. Community
  11. Community ecology
  12. Conservation biologist
  13. Distribution
  14. Ecosystem
  15. Ecosystem ecology
  16. Energy source
  17. Endangered species
  18. Evolution
  19. Habitat
  20. Homeostasis
  21. Inorganic nutrients
  22. Latitude
  23. Migration
  24. Nutrient cycling
  25. Organismal ecology
  26. Permafrost
  27. Photic zone
  28. Photosynthesis
  29. Physiological responses
  30. Population
  31. Population ecology
  32. Precipitation
  33. Rain shadow
  34. Species
  35. Temperature
  36. Torpor
  37. Water availability

Back of Card:

  1. The non-living components of the environment, such as temperature, sunlight, water, soil, and air.
  2. A gradual, reversible physiological adjustment to a new environmental condition.
  3. Physical changes in an organism’s body structure that help it adapt to environmental changes (e.g., growing thicker fur in winter).
  4. Airborne pollutants, such as acid rain or nitrogen deposition, which can alter ecosystems.
  5. Actions or movements organisms perform to reduce or avoid exposure to unfavourable environmental conditions (e.g., migration).
  6. Large geographic regions characterized by distinct climate, vegetation, and animal life.
  7. The global sum of all ecosystems, anywhere life exists on Earth.
  8. The living components of the environment, such as plants, animals, fungi, and microbes.
  9. The relationship between the amount of carbon stored and released in an ecosystem.
  10. All the different species living in a particular area and the interactions among them.
  11. The study of interspecific interactions between species within a community.
  12. A scientist who studies and develops methods to protect biodiversity and endangered species.
  13. The geographical area over which organisms are found.
  14. A community of living organisms interacting with the non-living elements of their environment.
  15. The study of how energy flows and nutrients cycle through biological communities and their physical environments.
  16. A basic abiotic factor required for life; most commonly, solar energy captured through photosynthesis.
  17. A species that is at serious risk of extinction.
  18. The process through which species change over time through genetic variation and natural selection.
  19. The natural environment in which an organism lives, including all the resources and conditions it needs to survive.
  20. Maintaining stable internal conditions in an organism despite changes in the external environment.
  21. Essential minerals (e.g., nitrogen, phosphorus, potassium) required for the growth and survival of organisms.
  22. A measure of how far a location is from the equator, affecting climate and biome distribution.
  23. The movement of organisms from one region to another, often seasonally, in response to environmental conditions.
  24. The movement and exchange of organic and inorganic matter back into the production of living matter.
  25. The study of how individual organisms adapt to their environments.
  26. A layer of permanently frozen soil found in tundra regions that affects drainage and plant growth.
  27. The upper layer of a body of water that receives enough sunlight for photosynthesis to occur.
  28. The process by which photosynthetic organisms convert sunlight into chemical energy.
  29. Short-term or reversible changes in an organism’s body function in response to environmental conditions.
  30. A group of interbreeding individuals of the same species living in the same area.
  31. The study of the number of individuals in a population and how and why that number changes over time.
  32. Rain, snow, sleet, or hail that falls to the ground influences biome types and plant life.
  33. A dry area on the leeward side of a mountain range is created when mountains block the passage of rain-producing weather systems.
  34. A group of organisms that can interbreed and produce fertile offspring.
  35. An abiotic factor that influences the range of environments in which organisms can survive and thrive.
  36. A state of decreased physiological activity in an animal, usually by a reduced body temperature and metabolic rate.
  37. The presence of water in an ecosystem is a critical factor for life.

OpenAI. (2025). ChatGPT. [Large language model]. https://chat.openai.com/chat
Prompt: Provide definitions for all the bolded terms in the shared content and list all the terms in alphabetical order.

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