BIO 121 Lecture Notes - Lecture 27: Prokaryotic Small Ribosomal Subunit, Physiognomy, Hickory
10 Dec 2020
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Document Summary
Classification of biomes: generalizes types of species and where they live, mostly focused on plants, where and why-largely on substrate and weather, temperature: physiognomy; precipitation. Variation due to differences in solar radiation- 2 major features. 40% energy from solar input at poles compared to tropics. Weather patterns cause community differences mediterranean and mixed temperate forest. Temperature and rainfall considered most important environmental factors. Equator region; rainfall exceeds 240 cm a year; >17c; soils are poor: nutrients leach. Tropical forests out; fallen leaves are quickly broken down. Human population is 20% of total world po. High species diversity: more than 50 types of trees. Found between 30degreed n- 30s, between latitudes tropical and temperate. Little water: less than 30 cm; high daytime temp; plants covers less than 10; in semiarid deserts: 10-33%: plants adapt to low water. Rainfall is 25-75 cm a year: low to support forests, higher than deserts.
