Plants make food during photosynthesis; they are called primary producers or autotrophs. Animalns eat the food. They are known as consumers or heterotrophs.
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1. What does the suffix“troph” mean? - The suffix “ Troph” means “One nourished or growing in the manner indicated2. What do you think a trophic level is? - A trophic level is one level within the trophic level pyramid 3. How about food chains, food webs? Compare and contrast those terms you learned in biology. Food chains- Basic hierarchy of food and Food webs- More detailed as it shows the what food eat what Similar- Both display the transfer of energy throughout organisms 4. Quickly sketch a food chain using organisms that might be found on our school grounds. a. What do you have to do to turn it into a food web? Do so. 5. Look at the following diagrams called Energy Pyramids.a. What do they all have in common? - They all have in common: There are steadily less and less species as you travel up the pyramid. There is also always more plants than pets b. How are they different from one another? - They are different because the energy pyramids show different ecosystems from one another. 6. Why are there are more organisms at the base and less organisms as you travel up the pyramid? - There are more organisms at the base as those organism are the auto-trophs a. Any idea what an energy pyramid shows? - An energy pyramid shows how energy is transferred (and loss) as it travels through consumers. 7. Two of the pyramids have numbers. Do you see a pattern in the numbers? a. What might the numbers mean? - The pattern of the numbers is that each trophic level up is 10x less than the trophic level below. The numbers might mean that every trophic level is transferred, 90% of energy is lossRead the following description from Earth Force http://www.earthforce.org/content/article/detail/1284 Energy pyramids, otherwise known as trophic level diagrams, are used to represent the flow of energy through an ecosystem. An organism’s trophic level indicates the organism’s position in the sequence of energy transfers. There are two obvious trends represented in an energy pyramid. First, there are enormous numbers and masses of individual animals or plants at the bottom and the numbers decrease as you reach the top. Secondly, the sizes and energy needs of the individual organisms generally increase as you reach higher levels. The bottom, or base, of an energy pyramid is a position always held by the producers and represents (by far) the largest percentage of biomass for the food web. The need for such a large biomass of producers is to support the energy needs for all the organisms at higher trophic levels. In the illustration above, the osprey is positioned at the highest trophic level. Therefore, for the energy transformations represented by the pyramid, the osprey is the organism with the greatest energy needs and relies on all of the transactions from producers to consumers to have enough energy left over to fill its own energy needs. It should be acknowledged that ecosystems are very complex and any food chain, food web or energy pyramid simply illustrates the general idea. It would be practically impossible to illustrate all the possible ways that animals interact and all the possible ways that energy moves throughout an ecosystem. Next, now that you’ve thought about food chains, energy pyramids and so on, let’s do someproblem solving. As you do these, think about the benefits and drawbacks of eating at lower trophic levels. First, for some background, read about soybeans from the… http://www.iasoybeans.com/index.htmlSmall Bean, Big Dreams “Small bean, big dreams” is a fitting motto for the versatile soybean plant. Known as the “Cadillac” of protein sources, soybeans nourish the people and animals of the world. Soybeans also help us reduce reliance on >petroleum through hundreds of renewable product innovations that enhance our everyday lives. All this from a bean so small that it takes around 150,000 soybeans to fill one bushel. Good things do come in small packages! Soybeans have a rich history from their creation in China 5,000 years ago. In our country, they started from humble beginnings, serving as ballast for Chinese ships coming to America. Making their U.S. agricultural debut in 1829 for soy sauce, inventors like George Washington Carver and Henry Ford embraced soybeans for plastics, printing inks and a range of industrial uses.Dreams Become Reality Between 1945 and 1985 the annual soybean harvest increased eleven-fold. Today, America grow around three billion bushels of soybeans and accounts for more than one-third of the world"s soybean crop. It represents a $16 billion crop that strengthens our country’s balance of trade while providing a domino effect of job growth and prosperity. The dreams of our early architects of innovation are reality today. For example, soybeans can be grown in space. Their compact nutrition and flavor variety is key to our astronauts. This small bean continues to dream and achieve – allowing soy to change our world. At 55 grams of protein per day, one acre of soybeans can meet a person’s dietary protein needs for 8,400 days Okay now for the problem... Its 2017. You"re the owner of a soybean farm. You also raise guinea hens for food and insect control. The hens will eat grasshoppers and other insect pests, including ticks. This is good. Biological control of your pests will save you money on chemical pesticides.The hens also act as watchdogs squawking a lot when intruders approach. You allow the hens to free range during the day in your fields and but at night, you provide roosts for them to keep them safe.
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Use the following for your calculations. Show all work with units!•You can live on 1 hen/day for a year •1 hen eats 25 grasshoppers/day (25gh/day) •1000 gh have a mass of 1 kns •1 gh requires about 30g soy/yr • 1 human requires about 600 gh/work • Dry soybeans have provide about 3.3 cal/g 1. Calculate the number ofgh a hen needs to eat per year. - 25gh*365days=9125 gh 2. How many gh are needed for a year’s supply of hens for you, the farmer? - 25gh*365day*365day= 3330625 gh 3. What is the total mass in kg, of thegh needed to feed all the hens for one year? - 3330625gh/1000g= 3330.625 kns 4. How many kg of soybeans are needed to feed all thegh for one year? 3330625gh*0.3g= 99918.75 kg 5. Sources tellus that Native American Indians ate gh. So you can too! These early Americans could collect about 90 kg of ghper hour, when they were abundant. How many people could thegh feed, compared to the one person that the hen fed? (Perhaps you could dip the gh in chocolate.) - 90kg*1000=900,000ns 900,000/600gh/day = 1500 people6. You need to consume 3000 calories/day. If you ate only soybeans how many grams of soybeans would you have to eat per day for calories alone?- 3000 cal/day DIVIDED by 3.3 cal/day = 909.1 soybeans 7. Cows produce about 19 kg protein/acre/year and soy produces 200 kg of protein/acre/year.a. Which is more efficient to eat? Why? - The soy is more efficient to eat. This is because the soy produces over 10x the protein/acre/year a cow does b. Have you ever eaten a soy burger (veggie burger)? Why or why not? I have eaten a soy burger before. This was because it was the only thing left a barbeque event 8. Intheory, the earth could support many more people if we ate at a lower trophic level. a. List 2 benefits of doing this. • More energy from eating lower trophic level • Less time spent on raising animals before consumption b. List 2 drawbacks of eating lower on the food chain. • Constantly the same foods • Animals already raised have nowhere to goc. What are some benefits of being a vegetarian?• More power • Less animal usage • No money spent on meatd. What are some drawbacks? • Not getting to eat mein ~ • No longer being considered an omivore • Only plants for the rest of your life • Lacking nutrients that may be only found in animals 9. And then there are fish to eat! Large predatory fish usually are found at the 3rdor 4thtrophic level of an energy pyramid. What does this mean in terms of energy loss? - Those fish have about 10^-2 or 10^-3 less energy than the plants that originally had that energy 1Large predatory animals can also be problematic to eat because of bioaccumulation and biomagnification of toxins such as lead or mercury in their habitats. 10. What do those two big words mean and why should this be considered when discussing food chains and trophic levels? Bioaccumulation: Accumalation of substances such as pesticides in an organism. This occurs when an organism absorb more toxins at a greater rate than the rate in which the substance loses toxins Biomagnification: concentrations of toxins in an organism as a result of ingesting other plants or animals They should be considered because those toxins are added in by us. Those toxins can also alter the food chain as it affects the health of those species that absorbed the toxin, and the species which will later consume the toxin. 11. Do you think about the food you eat? Why or why not?- I do not think about the food I eat. The food I eat is usually what is available so I eat it. I don"t really think about what to and what not to consume.