BIOL 2903 Lecture 2: Natural History Lecture 2 and 3
25 Feb 2017
School
Department
Course
Professor
Document Summary
Arboreal lichens grow on dead trees and are a source of food for biggest herbivores in boreal forests. Trap wind blown material (loess) and provide living place for moss. Some mosses can also be colonizers and be pioneer species. Lichens and mosses physically trap wind-blown material like soil- loess. The change from no life at all to organisms is called= sucession. When it"s ice is a force and can crack rocks and break it down. The dissolved and broken rocks help form more soil and more and more soil gets formed: plants start growing, then you have a forest and dead trees decompose, eventually you go from bare rock to hills. Where do plants and animals come from: glacial refugia- refuge from glaciers because their seeds come from wind. Wind brings non lichen seed dispersal to make new plants. Soil type, temp, precipitation effect site conditions, bedrock type, physiography. Maples can replace maples: this is called a climax forest.
