GENG2500: Engineering and the Environment - Ecological Pyramids - Engineering Assignment Help

Assignment Task :

1. Ecological Pyramids A. Construct a numbers pyramid for a grassland ecosystem containing 6,000,000 grasses, 700,000 insects, 350,000 birds and 3 bobcats present. Allow 1 mm to represent 100,000 individuals; each level of the pyramid should be 1 cm in height. 

B. In a given portion of an ocean ecosystem, phytoplankton supply 8,000 kilocalories, zooplankton supply 800 kilocalories of energy, fish species supply 80 kilocalories and sea lions supply 8 kilocalories. Construct an energy pyramid allowing 1 mm to represent 100 kilocalories; each level of the pyramid should represent 1 cm in height. C. In a wetland ecosystem there is approximately 800 g/m2 of wetland plants, 40 g/m2 of insects, 10 g/m2 of mice and 1.5 g/m2 of snakes. Construct a mass pyramid allowing allow 1 mm to represent 10 g/m2; each level of the pyramid should be 1 cm in height. 

2. The gross production of a grassland is 800 kJ m-2 yr-1. The total energy diverted to primary consumers is 60 kJ m-2 yr-1. For higher-level consumers, only 10% of the energy at each trophic level is passed on to the next level. Construct an energy pyramid showing primary, secondary and tertiary producers. What controls the number of trophic levels in an ecosystem? 

3. Energy flows In the energy flow scheme, find the net production at each trophic level. Find the total respiration energy. At the 1st trophic level, find the quantity diverted to the decomposers. 

4. What are the major nitrogen species in the atmosphere, the hydrosphere and lithosphere? 

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