factors_lab_report

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Saint Leo University *

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201

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Biology

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Jan 9, 2024

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Limiting Factors Lab Report Instructions: In this lab, you will investigate how limiting factors affect a population of cricket frogs in the Florida Everglades. Your scientific inquiry will focus on three limiting factors: food, predators, and pollution. Complete the following lab report to record your observations as you move through the simulation. You will submit your completed lab report for grading. Name and Title: Name Instructor’s name Mrs. Pagan Date: 9/12/2023 Lab: Limiting Factors Lab Report Objective(s): identify various limiting factors (abiotic and biotic) in an ecosystem. In your own words, what was the purpose of this lab? The purpose of this lab is to show and explain the ecosystem of organisms and the limited factors of the population of crickets and frogs in the Florida Everglades. Hypothesis: In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment. If predators are increased , then the cricket frog population will decrease over the span of five years. If pollution is increased , then the cricket frog population will decrease over the span of five years. If the amount of food available is increased , then the cricket frog population will increase over the span of five years. Procedure: Please be sure to identify the test variable (independent variable), outcome variable (dependent variable), and control group for this experiment.

Test variable (independent variable): The limited Factor (food, predator, population of the species). Outcome variable (dependent variable): The cricket frog population Control group: The cricket frogs Reminder: The test variable is the item that is changing in this investigation. The outcome variable is the item that you are measuring in this investigation. The control group is the group in the experiment where the factors being tested are not applied. It allows scientists to set a baseline to compare the experimental groups that do have factors applied to them. The procedures are listed in your virtual lab. You do not need to repeat them here. Data: Record your data from each trial in the data chart below: Type of Factor Beginning Frog Count Simulation 1 (Low) Simulation 2 (High) Predators (alligators) 50k 90k 40k Pollution 50k 50k 35k Food (mosquitoes) 50k 25k 85k Graphs Use the graphs you printed from the data chart in the virtual lab and analyze the data. Make a note of any trends that you discover. Predators (alligators): The alligators’ population was low so, then the cricket frog’s population increased. I increased the population of the alligator but then the cricket population was low. Pollution: The more pollution there is the more of a change in the population of the native organisms and a decrease in the cricket frogs. The less pollution the more of a healthy the environment is for the alligator, cricket frogs and mosquitoes.

The Food (mosquitoes): When the population increased of mosquitoes the cricket frog increased as well. I decreased the population of the mosquitoes I noticed the cricket frog population decreased as well. Conclusion: Your conclusion will include a summary and an interpretation of the lab results. Please write in complete sentences. 1. Which limiting factor(s) in this lab simulation are biotic? The cricket frog, the alligator, and the mosquitoes are biotic. 2. Which limiting factor(s) in this lab simulation are abiotic? Pollution is abiotic. 3. Which limiting factor impacted the cricket frog population the most? Use evidence to support your answer. The Alligator because when the population of the alligator increased the population of the cricket frog decreased to 40k. 4. Which limiting factor impacted the cricket frog population the least? Use evidence to support your answer. The food impacted the frog population by 25k. 5. Mosquitoes can carry and transmit disease to animals and humans. Explain how the cricket frog plays an important role in limiting the spread of mosquito-borne illnesses like West Nile virus and malaria. The cricket frog plays an important role in limiting the spread of mosquitoes-borne illness because Cricket frogs limit the mosquito’s disease spread by consuming the mosquitoes and decreasing the population of contaminated mosquitoes. 6. Predict the long-term effects of these limiting factors on the cricket frog population in the pond ecosystem. If there is an increase in pollution then there will be decreases in cricket frogs so, for the long term effect keeping the pollution at a low will be beneficial for the cricket frog population.

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