Population & Communities Definitions 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelCCEA Created by: stressystudentCreated on: 01-04-22 11:29 Population Number of individuals of the same species living in a defined area at a particular time 1 of 17 Abiotic factors Factors in the chemical and physical environment 2 of 17 Biotic factors The effect of other organisms of the same or different species 3 of 17 Environmental Resistance The sum total of biotic and abiotic factors which restricts population growth, preventing it from reaching its biotic potential 4 of 17 Biotic Potential The reproductive rate of a population under optimum environmental conditions, with unlimited resources 5 of 17 Pioneer species The first species to arrive and establish in a new environment 6 of 17 Carrying Capacity The maximum population a particular environment can support 7 of 17 Community The habitat and interactions of various populations within it 8 of 17 Ecological Niche The role an organism plays within an ecosystem 9 of 17 Pest any organism that causes economic damage 10 of 17 Competition When different organisms are competing for the same resource eg. space, nutrients or light There are 2 types: Intra- and Inter-Specific 11 of 17 Mutualism +/+ an interaction where both species benefit 12 of 17 Symbiosis +/+ a specialised form of mutualism, which involves some form of physiological interdependence between species the interaction is necessary for both 13 of 17 Commensalism +/= one species benefits, whilst the other is unaffected eg. orchids growing on branches, or burdock seeds attaching to animals for seed dispersal 14 of 17 Grazing +/~ a feeding relationship between a producer and consumer it benefits both to an extent 15 of 17 Predation +/- one species eats another 16 of 17 Parasitism +/- a specialised form of predation where the parasite gains at the expense of the host, but does not kill it 17 of 17
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