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BIO120H1 (305)

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University of Toronto St. George
Doug Thomson

Slide 25/26:  Temp (most) and soil moisture (next most) are most important  Soil quality/nutrients are next important  Nitrogen most important nutrient  If nutrients/temp/soil moisture not enough to limit plants success, we look at disturbance  Salinity is very important for aquatic plants (Fresh water vs. Salt water vs. brackish water… difference in physiology  Animals tend to survive in more difficult environments compared to plants  So, Animals will tend to follow plants,  Habitats quality important to animals, so habitats has to have quality (nesting, location, food) Slide 27:  Reactions are temperature dependent  Temp colder near the poles, hot near the equator  When Earth leans towards/away from sun, seasonality occurs,(summer/winter)  Seasonality is manifested as the alternation of the hot season and a cold season  No winter in lower latitudes, but seasonality is expressed as wet/dry seasons  Atmospheric circulation at heart of novels that talk about greenhouse grasses/global warming  These factors determine what type of animal and plants are located in which part of the world Slide 28:  More solar in put at the point of the earth closest towards the sun  More photos spread over a narrower band of the earth at the area closest to the sun thus hottest temperature  Differential heating sets things into motions  Differential heating of the earth surface is translated by the conduction of heat from the heated surface of the earth to the atmosphere, the air, above it and unlike the surface of the earth (which is fixed in place), air can move around, so the differential heating of the mass of the earth is transmitted to packets of air which become hotter or cooler and that’s sets those packets of air in motion  Predictable parts are located on the equator (or near it)  Surface of the earth heats, air particles near the surface heats up, looses density because particle are spread out more (moving faster), and thus air becomes more buoyant  This causes those heated air masses to rise into the atmosphere Slide 29:  Air close to the earth rises up when heated by the sun, (as packets) as it rises the air cools off at the rate up 5-10C/Km, as it cools, the ability to hold water vapor (in the gaseous phase) reduces, and the water vapor condenses as droplets of water, which produced rain as water falls  Thus air looses a lot of water vapor  This causes rainy environment in the equatorial regions (daily schedules)  Morning sunny, afternoon cloudy and then it rains  Atmospheric cells that circ
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