Ecology The study of the interactions of organisms and their environment

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Chapter 50

• Ecology - The study of the interactions of
  organisms and their environment

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organism - one individual population -
group of same species community - many
populations in
an area ecosystem the community plus the
abiotic parts of the environment
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A
B
C
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Dispersal How do species move into new
geographic areas?

• Purple loosestrife
• Zebra mussels
• African honeybee
• Kudzu

Invasive species
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main abiotic factors are Temperature Water
water balance Light photosynthesis ! Rocks and
soil Wind- amplifies heat loss and evaporation
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Climate wind, water, temperature
and light Ecosystems and
biomes are defined based on temperature and
precipitation eg. Desert, rainforest,
tundra
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How was this graph derived?
Woo Woo Graph!!
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How mountains affect rainfall
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• What is lake stratification and season turnover?
• ( a temperature change in the lake that affects
  oxygen distribution in the lake )
• How do the properties of water relate to lake
  stratification and turnover ?

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Lake stratification and seasonal turnover
Where everything lives in winter Water is most
dense at 4oC
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Figure 50.15 Lake stratification and seasonal
turnover (Layer 2)
Spring turnover in lake
Ice melts and warms water to 4o C. Water sinks
and winds mix oxygenated water throughout
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Figure 50.15 Lake stratification and seasonal
turnover (Layer 3)
Summer top is warm and high in oxygen. Dense,
colder Water stays at bottom
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Figure 50.15 Lake stratification and seasonal
turnover (Layer 4)
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What is a eutrophic lake? What causes this?
Water is nutrient rich, shallow, has lots
of plants, much organic matter Plants choke,
die, rot Rotting depletes O2
Is this good? Bad? Or neither?
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Wetland an area covered with water that
supports aquatic plants Area is permanently
saturated Wetlands are rich in species
diversity Wetlands store rain water and
prevent flooding, improve water quality by
filtering runoff Ex Bog, swamp, marsh,
vernal pool
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Silt fence retains silt in runoff
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Wetland buffer is an area of natural vegetation
around the wetlands
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Predator (herbivory ) removal experiments
Conclude for each line then make a final
conclusion
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Sow bugs - did they show kinesis?
did they show taxis?