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2AprilSlides - Present-day factors determining species...

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Present-day factors determining species distributions: Climate: the abiotic theater Average and annual variation in conditions of temperature and precipitation in a given region over the long-term Climate is a major determinant of the types of plants in an area What determines climate? 1. Incident solar radiation (varies with season and latitude) 2. Air circulation driven by solar radiation and Earth’s rotation When the sun is directly overhead, the atmosphere is heated causing air to rise… as it rises, it cools and cool air holds less moisture than warm air. Hadley cell Inter-tropical Convergence Zone (ITCZ)
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Incident radiation also changes with season Max. radiation at the equator Max. radiation at the equator Max. radiation at 23.5° N Max. radiation at 23.5° N Position of the ITCZ also shifts seasonally -where moist air rises from the surface, it condenses as it cools, producing precipitation, and wet regions (ITCZ) -where air sinks from aloft, it is dry, resulting in deserts (30°N and S latitude)
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This note was uploaded on 04/20/2008 for the course BIS 2A taught by Professor Grossberg during the Spring '08 term at UC Davis.

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2AprilSlides - Present-day factors determining species...

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