You are conducting an ecological study of two populations of invasive Italian Wall lizards in New York City, one in the Bronx and one in Staten Island. You decide to study the two populations using mark recapture in a 1 hectare plot in each park. In the Bronx, the park you sample is 100 hectares (1 km2), you mark 18 lizards initially. During your second sampling in the Bronx, you capture 20 lizards - of which 8 are recaptures (i.e., you marked them in the first sampling period). In Staten Island you sample a smaller park that is only 30 hectares in size, you mark 32 lizards initially. In Staten Island, you capture 43 lizards in your second sample - of which 24 are recaptures. 1. Which park has the larger estimated population size according to the mark-recapture survey? Choice 1 of 2:The Bronx Choice 2 of 2:Staten Island 2. You start to think that your estimates of population size might be a little too high. What is one reason why your estimates of population size might be artificially inflated? (in a few words) 3. Through your collaborators, you learn that they have precisely tracked populations of the lizard in NYC for several years. They inform you that the intrinsic growth rate (r) for the Bronx population is 0.4 and that a full census 3 years ago counted a population size of 1500. If the population is growing exponentially, what is the current population size? (use the discrete formula of exponential growth from class/your text) 4. Another thorough census finds that there are actually only 3800 lizards. Explain one mechanism of density-dependent regulation that might be imposing a carrying capacity? (in a few words)

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter14: Biotechnology And Society

Section: Chapter Questions

Problem 10QP

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You are conducting an ecological study of two populations of invasive Italian Wall lizards in New York City, one in the Bronx and one in Staten Island. You decide to study the two populations using mark recapture in a 1 hectare plot in each park.

In the Bronx, the park you sample is 100 hectares (1 km2), you mark 18 lizards initially. During your second sampling in the Bronx, you capture 20 lizards - of which 8 are recaptures (i.e., you marked them in the first sampling period).

In Staten Island you sample a smaller park that is only 30 hectares in size, you mark 32 lizards initially. In Staten Island, you capture 43 lizards in your second sample - of which 24 are recaptures.

1. Which park has the larger estimated population size according to the mark-recapture survey?

Choice 1 of 2:The Bronx

Choice 2 of 2:Staten Island

2. You start to think that your estimates of population size might be a little too high. What is one reason why your estimates of population size might be artificially inflated? (in a few words)

3. Through your collaborators, you learn that they have precisely tracked populations of the lizard in NYC for several years. They inform you that the intrinsic growth rate (r) for the Bronx population is 0.4 and that a full census 3 years ago counted a population size of 1500.

If the population is growing exponentially, what is the current population size? (use the discrete formula of exponential growth from class/your text)

4. Another thorough census finds that there are actually only 3800 lizards. Explain one mechanism of density-dependent regulation that might be imposing a carrying capacity? (in a few words)

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