BIOL1007 Lecture Notes - Lecture 22: Leaf Beetle, Commensalism, Tree Hollow
Document Summary
Many types that emphasise either common or rare species and have diff types of bia. Comparisons should be done using the same index. Simpsons index (used in calss) and shannon- weiner index. How do organisms get energy/ utrients: autotrophs. Make it themselves (synthesisse organic from inorganic compounds) Green plants, phytoplankton, algae (+chemosynthetic bac: heterotrophs, consumers, degraders, decomposers, get it from others, animals. Energy lossed moving through to secondary consumers of the food chain. Energy loss between trophic levels (elton 1927) Predisct- hugh pructivity ecosystems should have longer chains. Experimental evidence?- microbes- the experiment w tree hollows. If hypothesis supported then the high energy tree hollow would be ones w most species and trophic links. Fluctuations at low trophic levels magnify at high levels top predators more likely to go extinct. Predicts ; predictable (stable) environments should have longer chains. Observations among ecosystems useful byt may confound factors. 1 produces have very different life forms.
