Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
Which factors influence net primary productivity in terrestrial ecosystems?
Which factors influence net primary productivity in terrestrial ecosystems?
- Soil composition, altitude, biodiversity
- Light, temperature, amount of rainfall (correct)
- Water pH, oxygen levels, predation
- Wind speed, salinity, atmospheric pressure
In aquatic ecosystems, light and the availability of nutrients are the only factors limiting productivity.
In aquatic ecosystems, light and the availability of nutrients are the only factors limiting productivity.
True (A)
What is the approximate percentage of energy transferred from one trophic level to the next?
What is the approximate percentage of energy transferred from one trophic level to the next?
10%
At each trophic level, some energy will be lost to the environment in the form of _____ during cellular respiration.
At each trophic level, some energy will be lost to the environment in the form of _____ during cellular respiration.
Signup and view all the answers
Match each statement with its corresponding concept:
Match each statement with its corresponding concept:
Signup and view all the answers
Flashcards are hidden until you start studying
Study Notes
Terrestrial Ecosystem Productivity
- Factors affecting productivity:
- Light
- Temperature
- Rainfall
- Increased levels of these factors generally result in increased photosynthesis and productivity.
Aquatic Ecosystem Productivity
- Factors affecting productivity:
- Light
- Nutrient availability
Energy Transfer Between Trophic Levels
- Ecological pyramid: A diagram representing energy or matter distribution across trophic levels in a food chain/web.
- Energy transfer between trophic levels is approximately 10%.
- Energy loss reasons:
- Organisms use energy for life processes like respiration, movement, and reproduction.
- Not all organisms at one level are consumed by predators.
- Some consumed molecules are unusable by the predator.
- Cellular respiration energy cannot be passed on.
- Energy loss as heat during energy transformations.
- Limited energy transfer explains why food chains have few trophic levels.
Ecosystem Productivity
- Measured by:
- Gross primary productivity (GPP): Rate at which producers capture light energy, converted to chemical energy by photosynthesis.
- Net primary productivity (NPP): Energy stored in producer biomass, available to consumers.
- NPP = GPP - Respiration
- NPP variations:
- Tropical rainforests have significantly higher NPP than deserts.
- Rainforests cover 5% of Earth's surface but account for 30% of global NPP.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
