General Ecology_Mahaffy_Date_020910_021610_

General Ecology_Mahaffy_Date_020910_021610_ - Global...

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Global Climate Global climate Terrestrial ecosystem structure depends on dominant plants those are a reflection of prevailing environmental conditions (climate) Geographic variation in climate determines distribution of plants. Why they are where they are Climate: averages of temperature, rainfall, light, wind speed, etc Weather: the day to day variation in temperature, rainfall, light, wind speed, etc Seasons: long term predictable variation in these factors Only truly outside of the tropics Caused by changing angle of incoming radiation due to 23˚ tilt of the Earth’s axis The atmosphere Troposphere Lowest layer Where weather happens Stratosphere Lots of ozone Protects tropospheric oxygen from leaving Screens out UV-B Mesosphere Coldest Where shooting stars are found Thermosphere (ionosphere) Northern lights happen here Space shuttle orbits here
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General Ecology_Mahaffy_Date_020910_021610_ - Global...

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