slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Population & Community Ecology: PowerPoint Presentation
Download Presentation
Population & Community Ecology:

Loading in 2 Seconds...

play fullscreen
1 / 21

Population & Community Ecology: - PowerPoint PPT Presentation


  • 101 Views
  • Uploaded on

Population & Community Ecology:. Thursday 12 /7/ 13. population structure & growth limitations on growth // natural fluctuations community ecology properties of a community interspecific interactions competition symbiotic relationships Ecological Succession

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 'Population & Community Ecology:' - heman


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

Population & Community Ecology:

Thursday 12/7/13

  • population structure & growth
    • limitations on growth // natural fluctuations
  • community ecology
    • properties of a community
  • interspecific interactions
      • competition
      • symbiotic relationships
  • Ecological Succession
    • stability - response to disturbances
  • Quiz on Tuesday – 10pts
  • will cover today’s lecture (overlaps with lab)
  • will be able to use notes
slide2

Population ecology

  • & causes of these changes
slide3

Population Growth - how population size changes over time

fig 34.3

Exponential growth --

Logistic growth -

slide4

Population Growth -

    • what factors influence growth?

G =

r =

N =

K =

slide5

Carrying Capacity:

  • # of individuals an environment can support

fig 34.3

Environmental resistance:

-

slide6

Natural fluctuations in population size:

  • most long-term studies show population size determined by multiple factors
  • key selective factor
  • long-term studies are key
slide7

Ecological Footprint:

    • amount of land needed to “support” individuals
    • what demands are being placed on resources

Human Population Growth:

  • exponential growth
  • “unlimited” resources
    • impact on environment?
    • can growth continue?
slide8

Human population growth varies with countries:

see fig 34.5

  • growth rate
  • populations may still be
  • less developed countries

Fig 34.6

slide9

Limits on Population Growth:

  • Density-dependent:
  • biotic factors
  • greater impact w/ higher densities
  • resource limitations
  • predation / disease
slide10

Limits on Population Growth:

  • Density-independent effects:
    • affect populations regardless of density
      • major increases
    • examples:
    • these may also be
slide11

Competitive Exclusion:

two organisms competing for

one species will

can not survive

Ecological niche:

fig 34.8

slide12

Ecological Niche & Competition

fig 34.9

Fundamental niche:

Realized niche:

Two species of barnacles

Chthamalus is outcompeted in area of competition and realized niche is less than the fundamental niche

slide13

resource partitioning

  • if intense competition -->
    • subdividing niche --
    • seen in
slide14

Character Displacement

  • sympatric species tend to show
  • differences favored by natural selection
  • when in sympatry-
  • when in allopatry–
slide15

Co-evolution & Symbiosis

  • Symbiotic Relationships
  • Co-evolution
  • evolution of traits/behaviors
slide16

mutualism (+/+)

  • examples: mycorrhizae / plants
  • ants & acacia trees
slide17

parasitism (+/-)

  • an interspecific interaction
  • parasites rarely kill their hosts
slide18

Predator-Prey interactions (+/-):

  • predator consumes prey
  • predators impact on community varies --
    • no direct impact on population size --
    • maintaining population sizeof prey species –
    • reducing population size -
slide19

Adaptation of animal predators:

Plant and Animal Defenses

  • Adaptation of herbivores
slide20

Plant and Animal Defenses

  • adaptations of prey species:
  • plants:
  • animals:
slide21

Defenses & Counter-defenses:

  • mimicry
    • Mullerian mimicry
      • ex:
    • Batesian mimicry
      • ex:

stinging insects – Mullerianmimcs

fig 34.12

non-stinging insects – Batesianmimcs

Pipevine – toxic // Red-spotted - non-toxic