BIO120H1 Lecture Notes - Lecture 13: Lapse Rate, Soil, Gliding Flight
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BIO120H1 Full Course Notes
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Document Summary
Abiotic (physical and chemical) factors: resources and conditions. Substances that organisms need (can be used up) Conditions are not exhaustible: temperature, humidity, ph, salinity, etc. Species have ranges of tolerance along environmental gradients. Extreme example: the death zone on mt. Everest, o2 concentration 1/3 that of sea level. Nutrients (n most important, then p, k) Herbivory, disease, pollinators, seed dispersers, mycorrhizal fungi. Add salinity, remove moisture and fire, phosphorous is key. Temperature (would be most important for cold-blood animals, not so important to mammals if they have enough food and water) Gradients at the global level: temperature, rainfall, seasonality. Seasonality a function of temperature (hot summer- cold winter) Seasonality a function of rainfall (dry season-wet season) Rainfall mostly depends on atmospheric circulation, offshore ocean currents, rain shadows. At higher latitudes, light strikes the earth"s surface at a lower angle, and is spread over a greater area.
