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Copy of Ecology

Ecology notes
by

Meghan Azzaro

on 14 October 2011

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Transcript of Copy of Ecology

Ecology The study of the interactions of living organisms with one another and with their physical environment. Habitat The place where a particular population of a species lives Community different species that live together in a habitat. Ecosystem consists of a community and all the physical aspects of its habitat. Physical aspects of the habitat Abiotic factors biotic factors organisms in a habitat. biodiversity number of species living within an ecosystem An ecosystsystem includes large animals like deer and bears. It also includes smaller animals like rabbits. It includes insects, bacteria, and protists. Boundaries of an ecosystem are not always obvious It depends on the size of system that is being studied on how the system and boundaries are defined. Succession Progression of species replacement Primary Succession Occurs where plants had not previously grown Secondary Succession occurs in areas where there has been previous growth Primary Productivity determines the amount of energy available in an ecosystem. rate at which organic material is produced by photosynthetic organisms producers organisms that capture energy, plants, some bacteria, algae Consumers organisms that consume plants or other organisms to obtain energy necessary to build their molecules Trophic Level energy flow between organisms organized into levels Food Chain path of energy through the trophic levels Carnivores - animals that eat herbivores Herbivores - animals that eat plants or other primary producers Detritovores - organisms that obtain their energy from organic wastes and dead bodies that are produced at all trophic levels Bacteria and fungi are known as decomposers. Food web - animals feed at various trophic levels, a graphic organization of this is a food web. Energy Pyramid - diagram in which each trophic level is represented with a block that has a size determined by the amount of energy stored in the organisms at that trophic level Biomass - dry weight of tissue and other organic matter found in a specific ecosystem Omnivore - both herbivore and carnivore Pioneer Species after a natural disaster like a volcanic erruption or a formation of a new island the first organisms to live in a habitat tend to be small and fast growing make ground more hospitable for other species Glacier Bay Receding glacier leved piles of rock and lack nitrogen pioneer species are carried in by wind Energy Flow in Ecosystem Primary Energy source photosynthetic organisms
capture some of suns energy and convert it into chemical energy (food)
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