Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 45, Problem 4RQ
Which of the following methods will tell an ecologist about both the size and density of a population?
- mark and recapture
- mark and release
- quadrat
- life table
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Students have asked these similar questions
Quadrat sampling is a method by which organisms in a certain
proportion (sample) of the habitat are counted directly. As with all
sampling methods, it is used to estimate population parameters
when the organisms present are too numerous to count in total.
It can be used to estimate population abundance (number),
density, frequency of occurrence, and distribution. Quadrats
may be used without a transect when studying a relatively uniform
habitat. In this case, the quadrat positions are chosen randomly
using a random number table.
The general procedure is to count all the individuals (or estimate
their percentage cover) in a number of quadrats of known size and
to use this information to work out the abundance or percentage
cover value for the whole area. The number of quadrats used and
their size should be appropriate to the type of organism involved
(e.g. grass vs tree).
Estimated
average density
Total number of individuals counted
Number of quadrats X area of each quadrat
Guidelines…
Mark Recapture can be written as
M
N = R
Define each term.
Use this equation to answer the following question. Show your work.
A biologist for Mosaic fertilizer company catches 26 Florida scrub jays as part of their monthly environmental
monitoring. Each bird is given a band. The next month, they catch 32 birds. 13 of the birds have bands. What is the
estimated population size of the birds in that area?
A population of wolves in a national park is known to be 150 individuals. As wildlife ecologist, you are tasked with assessing the accuracy of the mark and recapture technique. At the start, you mark 30 wolves, and your recapture yields 20 wolves, 5 of whom are marked. State whether the mark and recapture data results in an over or underestimation of the actual population size, and show work to support your claim.
Chapter 45 Solutions
Biology 2e
Ch. 45 - Figure 45.2 As this graph shows, population...Ch. 45 - Figure 45.10b If the major food source of the...Ch. 45 - Figure 45.16 Age structure diagrams for rapidly...Ch. 45 - Which of the following methods will tell an...Ch. 45 - Which of the following is best at showing the life...Ch. 45 - Humans have which type of survivorship curve? Type...Ch. 45 - How is a clumped population distribution...Ch. 45 - Which of the following is associated with...Ch. 45 - Which of the following is associated with multiple...Ch. 45 - Which of the following is associated with the...
Ch. 45 - Species with limited resources usually exhibit...Ch. 45 - The maximum rate of increased characteristic of a...Ch. 45 - The population size of a species capable of being...Ch. 45 - Species that have many offspring at one time are...Ch. 45 - A forest fire is an example of regulation....Ch. 45 - Primates are examples of: density-dependent...Ch. 45 - Which of the following statements does not support...Ch. 45 - Which of the following events would not negatively...Ch. 45 - A country with zero population growth is likely to...Ch. 45 - Which type of country has the greatest proportion...Ch. 45 - Which of the following is not a way that humans...Ch. 45 - The first species to live on new land, such as...Ch. 45 - Which type of mimicry involves multiple species...Ch. 45 - A symbiotic relationship where both of the...Ch. 45 - Which of the following is not a mutualistic...Ch. 45 - The ability of rats to learn how to run a maze is...Ch. 45 - The training of animals usually involves...Ch. 45 - The sacrifice of the life of an individual so that...Ch. 45 - Why are polyandrous mating systems more rare than...Ch. 45 - Describe how a researcher would determine the size...Ch. 45 - The CDC released the following data in its 2013...Ch. 45 - Why is long-term parental care not associated with...Ch. 45 - Describe the difference in evolutionary pressures...Ch. 45 - Describe the rate of population growth that would...Ch. 45 - Describe how the population of a species that...Ch. 45 - Give an example of how density-dependent and...Ch. 45 - Describe the age structures in rapidly growing...Ch. 45 - Since the introduction of the Endangered Species...Ch. 45 - Describe the competitive exclusion principle and...Ch. 45 - Jaguars are a keystone species in the Amazon....Ch. 45 - Describe Pavlov’s dog experiments as an example of...Ch. 45 - Describe the advantage of using an aural or...
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- What is the estimated CARRYING CAPACITY of the population represented in the graph? * 600 ...... 500 роp 400 size 300 200 B. 100 TIME 385 О 290 575 О з30arrow_forwardDifferentiate transect and quadrat sampling. What are strengths and weaknesses of using such methods in doing terrestrial community ecologyarrow_forwardLook at the graph below. Grasshopper Population in Grassland - Green Grasshoppers - Brown Grasshoppers 80 60 40 20 Generation 1 Generation 2 Generation 3 Generation 4 Generation 5 After generation 3, explain a possible reason there is a change in the graph. Predict what change has occurred. Edit View Insert Format Tools Table 12pt v Paragraph v BIUarrow_forward
- Look at the graph below. Grasshopper Population in Grassland < Green Grasshoppers- Brown Grasshoppers 80 60 40 20 Generation 1 Generation 2 Generation 3 Generation 4 Generation 5 Explain what is happening in the graph prior to generation 3. Edit View Insert Format Tools Table 12pt v Paragraph BIU Av ev T?varrow_forwardSpecies: fox squirrel Question: What sampling method would you use to estimate N and why?arrow_forwardWhich letter on the graph represents the EXCEEDING phase of the graph? * 600 500 роp 400 size 300 200 B. 100 TIME A D B.arrow_forward
- A population's. is the specific environment in which it lives. Select an answer and submit. For keyboard navigation, use the up/down arow keys to select an answer. geographical range b growth rate size habitat dynamics Unanswered • 2 attempts left 1 Submit Question 2 Homework • Unanswered Why do species with large body sizes typically have lower population densities? Select an answer and submit. For keyboard navigation, use the up/down arow keys to select an answer. Small organisms have more potential mates. b Genetic diversity is low. There are not enough individuals to grow the population. d. Large organisms do not like living near one another. Each large organism consumes more available resources. Unanswered • 2 attempts left Submitarrow_forwardHigh diversity is equated with communitylecosystem stability because: It helps buffer environmental stresses on a community/ecosystem It provides a variety of nutrient source It sustains complex ecological interactions None is correctarrow_forwardYou are trying to estimate the population size of a school of fish in the Florida Keys. The first time, you sample and mark 37 sardines. The second time around, you capture 40 sardines and 13 of them were already marked. What is the estimated population size? Show your work!arrow_forward
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