0309-population-dynamics-worksheet

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California State University, Fullerton *

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402

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Mechanical Engineering

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Apr 3, 2024

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pdf

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Uploaded by SuperHumanIbis4165

Population Dynamics Worksheet Analysis Procedure Step 1: Label each observation above with B, I, D, or E (may have multiple) Step 2: Total the numbers for each rate (may not have numbers for all observations or all rates) Step 3: Compare B + I with D + E • B + I > D + E → Population growing • B + I < D + E → Population shrinking • B + I = D + E → Population stable Step 4: Use your analysis to answer any other questions about the scenario Scenario 1 A population of fish inhabit a cove on Catalina Island. These fish lay eggs twice a year, and it takes nearly a year for juveniles to reach maturity. A scientific survey showed that there were 100 fish in this population at the beginning of the year, but some events took place that had significant effects on the population: • A group of men were caught illegally fishing in this cove. They had harvested a total of 15 fish • As part of a scientific project, divers from the Wrigley Marine Lab on Catalina counted a total of 50 juveniles that hatched from the first clutch of eggs that were laid, and 58 that hatched from the second clutch • Only 25% of the juveniles hatched this year reached maturity • Development of a new marina in a nearby cove destroyed the habitat these fish require, which caused the population of 27 fish from that cove to move to this cove • Growing conditions were especially good for the algae on which these fish feed • A storm produced exceptionally high waves that killed 20 fish 1. Which rate(s) did NOT affect the population during the time described in this scenario? a. Birth b. Immigration c. Death d. Emigration e. None of these 2. Which type of factors are described in this scenario? a. Biotic, density-dependent b. Biotic, density-independent c. Abiotic, density-dependent d. Abiotic, density-independent e. None of these

Scenario 2 A CSUF graduate student has been studying a population of lizards near the Zyzxyx research station in the Mojave Desert. She made the following observations over the course of the past year: • Three lizards were found run over on the road to the station. • The high amount of rain lead to a mudslide that filled one of the rocky canyons where many lizards had burrows. This mudslide buried 12 lizards in their burrows. • The high amount of rain also produced an abundance of plant growth, which supported an especially large community of insects that are the preferred food of these lizards. • Because of increased activity at the nearby military installation, 7 lizards moved into this population • Detailed surveys of nests showed that 23 lizards were born over the course of the year. 3. If you are told that the population started the year with 103 lizards, and ended the year with 120 lizards, does this scenario describe ALL the factors that influenced this growth? If not, why? 4. Each of the following questions led to some confusion when this scenario was on an exam. Discuss why you think there may have been confusion & come up with a consensus answer for each item. a. The high amount of rain that produced a lot of plant growth & an abundance of insects is an example of something that will likely cause an increase in which type of growth rate? b. The lizards that moved from the military installation represent which type of growth rate?

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