ecosystems, population and sustainability definitions 0.0 / 5 ? BiologyEcology and biodiversityA2/A-levelOCR Created by: BeckyXXCreated on: 13-10-13 17:36 ecosystems system in which organisms interact with each other and their environment 1 of 25 trophic level an organisms position on the food chain 2 of 25 biotic and a biotic factors living and non- living components of the environment that affects the distribution and abundance of a species 3 of 25 producer an organism that transfers energy from light into inorganic and organic compounds 4 of 25 consumer an organism that obtains its energy 5 of 25 decomposer breaks down the organic remains of other organisms and return there matter back into the soil or air 6 of 25 habitat where an organism lives that provides food, water, shelter and breeding space 7 of 25 environment physical and non- living parts of an ecosystem 8 of 25 niche an organisms role within an ecosystem 9 of 25 succession the directional change in a community over time 10 of 25 primary succession when organisms colonise a lifeless habitat 11 of 25 secondary succession when organisms re- colonise a devastated ecosystem 12 of 25 deflected succession when human activity maintains the ecosystem 13 of 25 pioneer species first species to colonise an area 14 of 25 climax community end point of the succession with a stable environment 15 of 25 ecological pyramids diagrammatic representation of food webs and chains that represent the different trophic levels 16 of 25 denitrifying bacteria provides themselves with energy by reversing nitrogen fixation, converting nitrate to N2 gas which is returned to the air 17 of 25 nitrification the conversion of ammonium ions into nitrates in the soil in an oxidation reaction 18 of 25 denitrification a process involving the conversion of soil nitrates back into atmospheric nitrogen 19 of 25 community number of individuals of all species in a defined area 20 of 25 population density individuals per area eg km2 21 of 25 carrying capacity the maximum population that can be sustained by an ecosystem 22 of 25 limiting factors anything stopping population growth 23 of 25 inter specific competition competition occurring between members of different species- rare 24 of 25 intra specific competition occurs between member of the same species 25 of 25
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