Climate is the most important factor in determining ecosystems; precipitation is second
Grasslands- very few native left
A) High concentration of bacteria, many invertebrates, mostly nematodes or
B) Adapted to fire
C) Low rainfal
Deserts- occur where evaporation exceeds rainfall
A) California definition- if you have less than 10 inches of rainfall per
B) Wide temperature range (40-50 degrees Fahrenheit between day and
night) sometimes upwards of 100 degrees difference. Requir
A) Spruces, pines and firs (cone producing). Birches too (main deciduous trees)
B) Major source of timber crops
C) Soils are very acidic (exp. Pine forests). This prevents lots of other plants
growing underneath the trees.
D) Animals: b
Cover 79% of land and have more than half of all species of plants and animals in
240 tree species per hectare- Cambodia; Salvador (a state) in Brazil- 400
Island of Sumatra- 1 species of vascular plant per square meter
Lichens- combination of bacteria and fungus
Tierra del Fuego- equivalent taiga in northern area. Dominant tree is the beech tree.
Broad-leaf forests (example: eastern deciduous)
A) High diversity
B) Dominated by oaks, maples, beeches, and birc
Alpine zones are above the tree line?
Lakes and ponds are lentic systems.
Bullrush is a common plant.
Limnetic zone and profundal zone (vertical stratification)
Three zones- epilimenian, thermocline,
Climate Change and Ozone Depletion
Past Climate Change and the Greenhouse Effect.
Changes in the earths climate are not new by any means. Volcanic emissions, solar
input, continental shift because of tectonic plates, meteor strikes and other factors all
Factors Affecting Earths Atmosphere.
Harmful and Corrective Feedbacks in the Global Climate System.
Positive and negative feedback loops.
Can the Oceans Store More Carbon Dioxide and Heat?
Warming of oceans can lead to its carbons dioxide being released i
Effects of Global Warming
Effects of a Warmer Troposphere: An Overview.
Warmer climate can be beneficial in some areas by reducing winter, creating
precipitation, and increasing food production. It would be most harmful for poor nations
in the tropics whe
Dealing With Global Warming.
Why is Climate Change such a Difficult Problem to Deal With?
The problem is global and will require international cooperation. The effects last a long
time. It is a long term political issue, which is hard to approach. Harmful
What is being done to reduce Greenhouse Gas Emissions?
International Climate Negotiations: the Kyoto Protocol.
First phase went into effect in January 2005. Didnt require developing nations to cut
their emissions so it would keep their economic growth ali
Ozone Depletion in the Stratosphere.
Threats to Ozone Levels in the Stratosphere.
Ozone in stratosphere keeps 95% of the suns ultraviolet radiation from reaching earth, but it is
showing considerable seasonal depletion.
What causes ozone depletion?