12F Ecosystem Stability

1
12F Ecosystem Stability

• Describe how environmental change can impact
  ecosystem stability.

2
Ecosystem Stability

• Capability of an ecosystem to remain constant
  despite changing environment, number of species,
  population sizes, and interactions.

3
(No Transcript)
4
Biodiversity

• Variety of life within an ecosystem
• Lots of different types of plants and animals
  means a healthy ecosystem

5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
(No Transcript)
9
What can alter the stability?

• if individuals within the population cannot
  survive and reproduce, the population size will
  decrease
• individuals also might move out of the area if
  they cannot find resources

10

• if a disaster occurs (fire, storms, etc..) the
  biodiversity might change and populations might
  not be able to cope with the change

11
What causes loss of biodiversity?

• Global warming
• Pollution
• acid rain
• deforestation

12
3. FIRE

• Trees and other plants die
• Animals die or move away
• The topsoil is ruined, but under ground remains
  intact and ecological succession starts to occur

13
Before after a fire
14
(No Transcript)
15
4. STORMS

• (tornados, hurricanes, floods)
• Uproot trees
• kill animals
• Water is polluted

16
(No Transcript)
17
(No Transcript)
18
5. NATURAL CLIMATE CHANGE

• Normal climate change (seasons) occur every year
• Sometimes droughts occur killing plants and
  animals
• Sometimes a mild winter doesnt kill off insects
  and the summers crops are eaten by large
  population of insects
• Asteroids affect the entire ecosystem

19
(No Transcript)
20
6. Habitat Loss

• People chopping down forests to make farmland,
  build roads, shopping malls, etc
• deforestation

21
(No Transcript)
22
Rainforest Deforestation
23
a. HABITAT FRAGMENTATION

• When species are living in a small area of
  suitable habitat surrounded by areas of
  unsuitable habitat

24
(No Transcript)
25
Great Ape Habitat Africa
26
(No Transcript)
27
7. Pollution

• Impacts both land and water
• Examples
• - Mercury DDT biomagnification in ospreys and
  pelicans
• Oil spills
• Might take 50 years for ecosystem to recover

28
Pollution
29
(No Transcript)
30
DDT and affects on Brown Pelican egg
31
Mercury Effects

• Mercury has been measured in aquatic and
  terrestrial invertebrates, in a variety of
  plants, and in many higher organisms including
  humans. High concentrations of mercury have been
  associated with developmental and behavioral
  abnormalities, impaired reproduction and
  survival, and in some cases with direct
  mortality.

32
Acid Precipitation
33
(No Transcript)
34
8. Invasive Species

• An organism not normally found in a a particular
  ecosystem
• Brought in by accident on boats fishing from
  lake to lake or people release aquarium fish in
  nearby waters
• Or brought in by man kudzu plant was brought in
  for livestock feed and erosion control

35
(No Transcript)
36
(No Transcript)
37
9. Global Climate Change

• Levels of CO2 rising in the earths atmosphere
  for the past 100 years
• Trapped CO2 causes earths temperature to rise.
• More or less rain in some areas (drought,
  flooding)
• Milder winters, hotter summers

38
Warming Trend
39
(No Transcript)
40
(No Transcript)
41
(No Transcript)
42
(No Transcript)
43
(No Transcript)