BI SC 002 Lecture Notes - Lecture 52: Insecticide, Ecological Pyramid, Herbivore
30 Nov 2016
School
Department
Course
Professor
Document Summary
Energy pyramids more accurately reflect: amount of energy transfer. Only 10% (approximately) is available to the next trophic level. Has to eat a lot of songbirds. Not enough energy to keep on going. Much of the energy is lost as heat. Energy is required to: fuel cellular activities. Some components cannot be digested: therefore: Examples: hair, some indigestible plant material. Food chains depict: linear series of species. Food webs are more complete: many interconnected food chains. All species occupying the same position within a food chain comprise: a trophic level within the food web. Harmful chemicals may accumulate in the highest trophic levels. Rule of 10": applies to harmful substances. Has to consume 10 times the amount in order to get the. Biomagnification energy: accumulation of toxic substances in food chains. Mercury: plankton absorbs, shrimp each a lot of plankton to stay alive, tuna eats lot of shrimp, shark eats lots of tuna. Meat diet pyramid: plants, cattle, humans.
