Worksheet #9 - Ecosystem Food Web Worksheet (2)

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University of British Columbia *

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121 - 003

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Biology

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Apr 3, 2024

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© UBC BIOL121 – NOT FOR RESALE Name: Student Number: 1 WORKSHEET #9 - ECOSYSTEMS: FOODWEBS Due Sunday, April 11 th @ 11 pm 1. ( The following is an exam question from a previous term. ) As part of your graduate studies, you have created a simplified 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 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. atmospheric carbon (in the form of CO 2 ) entering the food web iv. carbon leaving the food web (in the form of CO 2 ) Continued on next page… Renz Tingson 30812564 Halteria Mysis Calanoid copepods Coelastrum CO2 Microcystis Heterotrophic bacteria
© UBC BIOL121 – 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 decrease not change increase decrease not change You add a parasite of Mysis to the tank, which decreases the Mysis population increase decrease not change increase decrease not change You introduce a predator that consumes only Microcystis ( Note : Microcystis is the only nitrogen fixing species in the tank) increase decrease not change increase decrease not change Because phsphorous is a limiting factor, increasing its amount will allow populations that depend on it (producers) to also increase. Because there are now more producers (prey), the amount of primary consumers will increase, alowing the amount of secondary consumers to increase, which will allow our tertiary consumer population to increase, INCREASING the total biomass of our tank ecosytem. Because the Mysis population is one, a parasyte that decreases its population would result in a Mysis population of zero. Now that there are no more Mysis predators, the Calanoid copepods population will grow. Because they feed on Halteria, an increase in the Calanoid copepods population will result in a decrease in Halteria population, which in turn creates an increase for Microsrocystis and Coelastrum. The producer population is the largest, and therefore an increase in their population would result in an increase of the total biomass of the tank ecosystem. I'm not as confident on this one, but the reason why I believe the total biomass of the ecosystem will not change is because (in addition to the new primary consumer population) now that the number of nitrogen fixing species decrease, there will be excess nitrogen in the ecosystem, which will very greatly boost the growth of algal populations, possibly in a large enough way that the loss of Microcystis's biomass is balanced out. Renz Tingson 30812564
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