Worksheet+%2313+-+Food+Webs+-+Answer+Key

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University of British Columbia *

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121

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Biology

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Feb 20, 2024

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© UBC BIOL121-221 – NOT FOR RESALE Name: Student Number: 1 ECOSYSTEMS: FOOD WEB WORKSHEET 1. As part of your graduate studies, you have created a simple freshwater community in a tank (in your lab). The table below gives the relative biomass of each population in the tank: Relative biomass Organism 500 Coelastrum 56 Halteria 6 Calanoid copepods 600 Microcystis 1 Mysis a. Based on the information provided above, draw a food web representing your lab ecosystem. Make sure you include the following: i. a heterotrophic bacteria (i.e., a decomposer – not shown in the table) ii. arrows that indicate the direction of energy flow (e.g., prey → predator) iii. inorganic carbon (in the form of CO 2 ) entering the food web iv. carbon leaving the food web (in the form of CO 2 ) You can also draw arrows leaving organisms separately and not all congregating to a box as shown above. During the class you have done one exercise on this so you know how it should be done. Continued on next page…

© UBC BIOL121-221 – NOT FOR RESALE Name: Student Number: 2 2. Make a prediction: What do you expect to happen to the population of producers and overall biomass of the tank in each of the scenarios listed below? Scenario Prediction (circle one): Explain the reasoning behind your prediction: Population of producers will: Biomass of the tank ecosystem will: You add phosphorous (a limiting nutrient) to the tank increase increase Addition of the limiting nutrient will enable more growth of the producers, which will transfer biomass to the rest of the community. You add a parasite to the tank, which decimates the Mysis population increase increase Removal of the top trophic level ( Mysis ) will cause a trophic cascade that increases the abundance of producers. This could increase the biomass of the tank because more of the nutrients are now in the producers You introduce a predator that consumes only Microcystis ( Note : Microcystis is the only nitrogen fixing species in the tank) decrease decrease Reducing the biomass of a producer will reduce overall biomass. Reducing nitrogen fixation (i.e., entry of nitrogen into the system) will also reduce the productivity of the other producer, again lowering biomass. Lower producer biomass = lower consumer biomass. ( Note: Can accept “no change” if a reaso nable explanation is provided – e.g., nitrogen is not limiting, so the other producer will still be able to grow and make up for the loss in biomass).

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