WorksheetsEcology Chapter 12
Total questions: 27
Worksheet time: 15mins
what is "population dynamics"
Population dynamics is the variation in a population over space or time
What is called when a population grows beyond its carrying capacity
Overshoot
A substantial decline in density that typically goes well below the carrying capacity
Die-off
Overshoot
Regular oscillation of population size over a long period of time
population cycles
What is delayed density dependence?
When the effect of population density on population growth rate is delayed
When the effect of population density on population growth rate is immediate
When the effect of population density on population growth rate is not immediate
When density dependence occurs based on a population density at some time in the past
A pattern of population growth in which the population size initially oscillates, but the magnitude of the oscillations declines over time
Stable limit cycle
A pattern of population growth in which the population size continues to exhibit large oscillations over time
stable limit cycle
What is the logistic growth model?
The logistic growth model is a mathematical model used to describe how population growth changes over time
The model includes a term, carrying capacity (K), that limits growth at high densities
What is the delayed-density dependence growth model?
An extension of the logistic growth model that only considers the effect of time delay on population growth, t-tau
An extension of the logistic growth model that predicts immediate population growth based on current population density, t-tau
An extension of the logistic growth model in which population growth is affected by population size at a time in the past, t-tau
An extension of the logistic growth model that ignores the effect of population density on population growth, t-tau
What effect does increasing tau have on the delayed-density dependence of the logistic growth model
It increases the time delay in the effect of population density on growth rate (massive decrease in population)
you will see bigger oscillations
A model that is designed to predict a result without accounting for random variation in population growth rate
What is a stochastic model?
A stochastic model is a model that incorporates random variation in population growth rate
Which stochasticity is this: variation in birth rates and death rates due to random differences among individuals
Which stochasticity is this: variation in birth rates and death rates due to random changes in environmental conditions
Metapopulation are composed of (a) that can experience independent population dynamics across space
What is habitat fragmentation?
The process of breaking up large habitats into a number of smaller habitats.
The process of increasing biodiversity within a habitat.
The expansion of a continuous habitat into smaller, connected patches.
The process of creating larger, connected habitats.
What is a subpopulation?
Smaller, isolated groups of individuals that are part of a larger population
What is a metapopulation?
A collection of subpopulations that are part of a larger population
A subpopulation in high quality habitat whose offspring disperse to other habitats
A model that describes a scenario in which there are patches of suitable habitat embedded within a matrix of unsuitable habitat
Basic metapopulation model
A subpopulation in a low-quality habitat that rarely produces enough to offspring to create disperses
What is the source-sink metapopulation model?
A population model that builds on the basic metapopulation model and accounts for the fact that not all patches of suitable habitat are equal quality
What are source subpopulations?
In high quality habitats, subpopulations that serve as a source of dispersers within a meta population
contains the most realistic conditions of habitat patches that differ in equality and a surrounding matrix that is variable in its suitability for dispersal and the presence of dispersal barriers
Uniform landscape model
Dispersal matrix model
The landscape population model
Habitat fragmentation model
What is the rescue effect?
The phenomenon of dispersers supplementing a declining subpopulation that is headed toward extinction
Consider a biologist studying a population of deer. At the beginning of the year, there are 100 adult deer in the population. Over the course of the year, 15 adult deer die, and an additional 25 deer are born. Using the geometric growth model N1 = N0 λ what can we conclude about λ for this year?
λ < 0
λ = 0
λ > 0
λ = 1
λ > 1
The following table shows the survival and fecundity of a flowering plant. This plant species has a(n)
Type I survivorship curve - low juvenile mortality
Type II survivorship curve - constant mortality
Type III survivorship curve. - high juvenile mortality
S-shaped survivorship curve
