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ECOLOGY UNIT

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ECOLOGY UNIT Chapter 18: Introduction to Ecology Chapter 19: Populations Chapter 20: Community Ecology Chapter 22: Humans and the Environment Ecology: Study of the ... – PowerPoint PPT presentation

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Title: ECOLOGY UNIT


1
ECOLOGY UNIT
  • Chapter 18 Introduction to Ecology
  • Chapter 19 Populations
  • Chapter 20 Community Ecology
  • Chapter 22 Humans and the Environment

2
  • Ecology Study of the interactions between
    organisms and the living and nonliving components
    of their environment
  • Survival depends on interactions interdependence

3
Levels of Organization
4
Habitat vs Niche
  • Habitat the actual place an organism lives
    address
  • Niche way of life (role) within its environment
    job

5
Energy Flow
  • Herbivores
  • Carnivores
  • Omnivores
  • Decomposers

6
10 of the energy available at one trophic level
is transferred to the next
7
(No Transcript)
8
Keystone Species
9
What is a keystone?
  • Stone at the top of an arch
  • Supports the other stones
  • Keeps whole arch from falling

http//www.morning-earth.org/Images/keystoneL.jpg
10
What is a keystone species
  • Species whose presence contributes to a diversity
    of life and whose extinction leads to the
    extinction of others
  • Loss of a keystone species is like a drill
    accidentally striking a power line. It causes
    lights to go out all over.
  • - E.O. Wilson

11
Prairie Black Tailed Prairie
Dogs
  • Burrows act as homes
  • burrowing owls, badgers, rabbits, black-footed
    ferrets, snakes, salamanders, and insects.

12
  • Burrowing activity works to loosen and churn soil
  • Increases the ability to sustain plants
  • Foraging and feeding practices enable a more
    nutritious, diverse and nitrogen-rich mixture of
    grasses to grow.

13
  • Africa Grasslands
  • Africa Elephant
  • Many plant species are dependent on passing
    through an elephant's digestive tract before they
    can germinate
  • - 1/3 of tree species in west African forests
    rely on elephants.

http//www.youtube.com/watch?vUMFWdTVtQw0
14
Marine Kelp Forest Sea Otter Keep the sea
urchin populations in check. Sea Urchins feed on
the kelp which are critical habitat for
spawning fish. Fish population will
decline
http//www.pbs.org/kqed/oceanadventures/video/kelp
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