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2.4 Ecological Pyramids

AB
Each step in a food chain or ecological pyramid is called a ____.trophic level.
The first trophic level in a food chain or ecological pyramid is made up of ____.producers (autotrophs).., Audio
The second trophic level in a food chain or ecological pyramid is made up of ____.first level consumers (remember, the first, or bottom level was made of producers)
The third trophic level in a food chain or ecological pyramid is made up of ____.second level consumers (remember, the first level was producers and the second level was first level consumers)
If all the plants in a field were determined to contain 10,000 calories of energy, how much energy would you expect to consume by eating all the animals that feed on those plants in the field?1000 calories (Remember the 10% rule. You would only expect there to be 10% as much energy (1000 calories) stored in the herbivores at the next trophic level. If you ate those all of those herbivores, you would be getting all 1000 calories that are stored in their bodies)
If all the herbivores in an ecosystem had a biomass of 50,000 kg, what would you expect all of the carnivores at the next trophic level to weigh altogether?5,000 kg (remember the 10% rule)
Why do ecological pyramids rarely have more than 4 trophic levels?Energy usually runs out by the 4th trophic level (because 90% is used up (or not digested at all) at each level and only 10% gets stored and can be passed on to the next level, so by the time you get to the top levels, there is only a fraction of a percent of energy left compared to what you would find at the producer level.)
The original source of energy that flows through an ecosystem comes from ____.the sun
The total amount of living tissue in an ecosystem, expressed in kilograms, is called ____..biomass
TRUE or FALSE: If you eat a chicken, you will only take in 10% of the calories (a unit of energy) that are found in that chicken.FALSE (You get all of the calories in the chicken. However, you will probably only store about 10% of those calories. The rest will be burned for energy and some will never be digested in the first place and just pass right through your digestive tract and end up in the toilet as fecal matter, aka "poop." Calories that you don't burn or digest stay inside the molecules of food you eat and those molecules get added to your body causing you to get bigger)
TRUE or FALSE: If you eat a chicken, you will only store about 10% of the calories (a unit of energy) that are found in that chicken.TRUE (You will burn about 90% of the calories. Only the 10% that you don't burn for calories will be stored. We usually store our calories as fat, but if that food was used to make muscle, muscle has calories too. When you eat meat, you are eating the muscles of an animal)


Truman High School

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