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Lecture

Lecture #1 BIO120 2013.docx

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Department
Biology
Course
BIO120H1
Professor
James Thomson
Semester
Fall

Description
Lecture #1 8/27/2013 6:46:00 PM What factors most important for PLANTS Terrestrial:  Temp  Soil moisture  Nutrients (Most important: N, P, K)  Disturbance (Ex. humans, fire)  Herbivory, disease, pollinators, seed dispensers, mycorrhizal fungi Aquatic:  Salinity  Temp  Nutrients (Most important: N, P, K)  Disturbance (Ex. humans, fire)  Herbivory, disease, pollinators, seed dispensers, mycorrhizal fungi  Animals tend to follow plants Gradients at the global level: temp, rainfall, seasonality  Temp mostly function of latitude  Seasonality (caused by tilt of earth)  Higher latitudes colder (summer-winter)  Lower latitudes warmer (dry season – wet season)  Rainfall mostly depends on atmospheric circulation, offshore ocean currents, rain shadows  These factors determine biomes  Higher angle (equator) = smaller area for photons from sun (hotter)  Lower angle (high latitude) = more spread out since more surface area Atmospheric circulation: Hadley cells make equatorial regions rainy  Heated air rises, air cools as it rises o Governed by adiabatic lapse rate, 5-10C/km  As air cools, water vapour condenses and falls as rain near equator  Air warms as it falls: adiabatic process is reversible  Dry, high-pressure areas at +/- 30 degrees  Manifests
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