chapter 8
Download
Skip this Video
Download Presentation
Chapter 8

Loading in 2 Seconds...

play fullscreen
1 / 22

Chapter 8 - PowerPoint PPT Presentation


  • 263 Views
  • Uploaded on

Chapter 8. Population Ecology. Video: Otter Feeding. PLAY VIDEO. POPULATION DYNAMICS AND CARRYING CAPACITY. Most populations live in clumps although other patterns occur based on resource distribution. Figure 8-2. (a) Clumped (elephants). Fig. 8-2a, p. 162. (b) Uniform (creosote bush).

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 'Chapter 8' - Renfred


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
chapter 8

Chapter 8

Population Ecology

population dynamics and carrying capacity
POPULATION DYNAMICS AND CARRYING CAPACITY
  • Most populations live in clumps although other patterns occur based on resource distribution.

Figure 8-2

slide4
(a) Clumped (elephants)

Fig. 8-2a, p. 162

slide6
(c) Random (dandelions)

Fig. 8-2c, p. 162

exceeding carrying capacity move switch habits or decline in size
Exceeding Carrying Capacity: Move, Switch Habits, or Decline in Size
  • Members of populations which exceed their resources will die unless they adapt or move to an area with more resources.

Figure 8-6

slide10
Population

overshoots

carrying

capacity

Population

Crashes

Number of reindeer

Carrying

capacity

Year

Fig. 8-6, p. 165

population density and population change effects of crowding
Population Density and Population Change: Effects of Crowding
  • Population density: the number of individuals in a population found in a particular area or volume.
    • A population’s density can affect how rapidly it can grow or decline.
      • e.g. biotic factors like disease
    • Some population control factors are not affected by population density.
      • e.g. abiotic factors like weather
types of population change curves in nature
Types of Population Change Curves in Nature
  • Population sizes may stay the same, increase, decrease, vary in regular cycles, or change erratically.
    • Stable: fluctuates slightly above and below carrying capacity.
    • Irruptive: populations explode and then crash to a more stable level.
    • Cyclic: populations fluctuate and regular cyclic or boom-and-bust cycles.
    • Irregular: erratic changes possibly due to chaos or drastic change.
types of population change curves in nature13
Types of Population Change Curves in Nature
  • Population sizes often vary in regular cycles when the predator and prey populations are controlled by the scarcity of resources.

Figure 8-7

slide14
Hare

Lynx

Population size (thousands)

Year

Fig. 8-7, p. 166

reproductive patterns opportunists and competitors
Reproductive Patterns:Opportunists and Competitors
  • Large number of smaller offspring with little parental care (r-selected species).
  • Fewer, larger offspring with higher invested parental care (K-selected species).

Figure 8-9

reproductive patterns
Reproductive Patterns
  • r-selected species tend to be opportunists while K-selected species tend to be competitors.

Figure 8-10

slide18
Late loss

Constant loss

Percentage surviving (log scale)

Early loss

Age

Fig. 8-11, p. 169

ad