Populations grow exponentially
Download
1 / 20

Populations grow exponentially - PowerPoint PPT Presentation


  • 262 Views
  • Updated On :

Populations grow exponentially . 4.1. when populations are relatively small and resources are plentiful. when most mature individuals in the population have an opportunity to reproduce. for an indefinite period of time, independently of resources. when they follow an S-shaped growth curve.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Populations grow exponentially ' - KeelyKia


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Slide1 l.jpg

Populations grow exponentially

4.1

  • when populations are relatively small and resources are plentiful.

  • when most mature individuals in the population have an opportunity to reproduce.

  • for an indefinite period of time, independently of resources.

  • when they follow an S-shaped growth curve.

  • under conditions described by 1 and 2.


Slide2 l.jpg

Populations grow exponentially

4.1

  • when populations are relatively small and resources are plentiful.

  • when most mature individuals in the population have an opportunity to reproduce.

  • for an indefinite period of time, independently of resources.

  • when they follow an S-shaped growth curve.

  • under conditions described by 1 and 2.


Slide3 l.jpg

When a population reaches equilibrium,

4.2

  • there are no new individuals born into the population.

  • the population will not change as long as the individuals live for a long time.

  • the number of individuals born into the population approximately equals the number of individuals dying.

  • the number of individuals can easily increase at any time.

  • every individual will have unlimited access to resources.


Slide4 l.jpg

When a population reaches equilibrium,

4.2

  • there are no new individuals born into the population.

  • the population will not change as long as the individuals live for a long time.

  • the number of individuals born into the population approximately equals the number of individuals dying.

  • the number of individuals can easily increase at any time.

  • every individual will have unlimited access to resources.


Slide5 l.jpg

The reproductive strategy shown by most insect species is

4.3

  • produce very many young, then provide them with attentive parental care.

  • produce relatively few young, but provide them with attentive parental care.

  • produce very many young, but allow them to take their chances without much parental care.

  • an example of low biotic potential.

  • so different from one species to another that it is impossible to make a generalization.

DRMercer©


Slide6 l.jpg

The reproductive strategy shown by most insect species is

4.3

  • produce very many young, then provide them with attentive parental care.

  • produce relatively few young, but provide them with attentive parental care.

  • produce very many young, but allow them to take their chances without much parental care.

  • an example of low biotic potential.

  • so different from one species to another that it is impossible to make a generalization.

DRMercer©


Slide7 l.jpg

Environmental resistance is described by all of the following EXCEPT

4.4

  • it is essentially zero when populations are very small.

  • it is relatively constant regardless of the population size.

  • it is the combination of natural factors that slows down the rate of growth for natural populations.

  • it is responsible for maintaining populations near their maximum sustainable equilibrium number.

  • it becomes greatest as populations approach their carrying capacities.


Slide8 l.jpg

Environmental resistance is described by all of the following EXCEPT

4.4

  • it is essentially zero when populations are very small.

  • it is relatively constant regardless of the population size.

  • it is the combination of natural factors that slows down the rate of growth for natural populations.

  • it is responsible for maintaining populations near their maximum sustainable equilibrium number.

  • it becomes greatest as populations approach their carrying capacities.


Slide9 l.jpg

Which of the following mortality factors is density independent?

4.5

  • transmission of infectious disease

  • lack of essential resources

  • late spring freeze in temperate region

  • infection by parasites

  • predation


Slide10 l.jpg

Which of the following mortality factors is density independent?

4.5

  • transmission of infectious disease

  • lack of essential resources

  • late spring freeze in temperate region

  • infection by parasites

  • predation


Slide11 l.jpg

Which of the following is NOT true about the predator–prey relationships shown in Figure 4–5?

4.6

  • Wolves can outnumber moose.

  • Peaks in the number of wolves occur sometime after peaks in the number of moose.

  • Wolves must be much less numerous than moose.

  • When wolf numbers are lowest, the moose population can begin to recover.

  • If both predator and prey are present, neither population will become so common that its environment is damaged.


Slide12 l.jpg

Which of the following is NOT true about the predator–prey relationships shown in Figure 4–5?

4.6

  • Wolves can outnumber moose.

  • Peaks in the number of wolves occur sometime after peaks in the number of moose.

  • Wolves must be much less numerous than moose.

  • When wolf numbers are lowest, the moose population can begin to recover.

  • If both predator and prey are present, neither population will become so common that its environment is damaged.


Slide13 l.jpg

A keystone species relationships shown in Figure 4–5?

4.7

  • is one that occupies the base level of a feeding pyramid.

  • is the most common species in an ecosystem.

  • is the largest species in an ecosystem.

  • is one whose removal would upset the relative populations of many other species within an ecosystem.

  • is a type of animal from Pennsylvania, known as the keystone state.


Slide14 l.jpg

A keystone species relationships shown in Figure 4–5?

4.7

  • is one that occupies the base level of a feeding pyramid.

  • is the most common species in an ecosystem.

  • is the largest species in an ecosystem.

  • is one whose removal would upset the relative populations of many other species within an ecosystem.

  • is a type of animal from Pennsylvania, known as the keystone state.


Slide15 l.jpg

Competition relationships shown in Figure 4–5?

4.8

  • can occur between individuals of the same species or individuals of different species that require a limiting resource.

  • happens only in mobile animals.

  • is generally resolved by violent conflict.

  • has impacts upon the performance of individuals in a population but little to do with the makeup of an ecosystem.

  • occurs because different species have the same abilities to exploit their environments.


Slide16 l.jpg

Competition relationships shown in Figure 4–5?

4.8

  • can occur between individuals of the same species or individuals of different species that require a limiting resource.

  • happens only in mobile animals.

  • is generally resolved by violent conflict.

  • has impacts upon the performance of individuals in a population but little to do with the makeup of an ecosystem.

  • occurs because different species have the same abilities to exploit their environments.


Slide17 l.jpg

Invasive species generally cause problems because they relationships shown in Figure 4–5?

4.9

  • have new biotic potentials within their new habitats.

  • are often introduced without appropriate environmental resistance factors.

  • occupy new trophic levels in their new habitats.

  • are unlike any organisms that previously occupied the invaded region.

  • are much larger than competing organisms within their new habitats.


Slide18 l.jpg

Invasive species generally cause problems because they relationships shown in Figure 4–5?

4.9

  • have new biotic potentials within their new habitats.

  • are often introduced without appropriate environmental resistance factors.

  • occupy new trophic levels in their new habitats.

  • are unlike any organisms that previously occupied the invaded region.

  • are much larger than competing organisms within their new habitats.


Slide19 l.jpg

Adaptation results from relationships shown in Figure 4–5?

4.10

  • a population improving itself.

  • individuals with traits that are better suited for environmental conditions producing more offspring than their competitors within a population.

  • individuals within a population changing their traits to better fit their surroundings.

  • the dying off of less fit individuals within a population.

  • constant expression of genetic traits within a population.


Slide20 l.jpg

Adaptation results from relationships shown in Figure 4–5?

4.10

  • a population improving itself.

  • individuals with traits that are better suited for environmental conditions producing more offspring than their competitors within a population.

  • individuals within a population changing their traits to better fit their surroundings.

  • the dying off of less fit individuals within a population.

  • constant expression of genetic traits within a population.


ad