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Topic 7
Populations abiotic and biotic factors
| Term | Definition |
|---|---|
| Population | Group of organisms of the same species living in the same area at the same time that can interbreed to make a fertile offspring |
| Habitat | Part of an ecosystem in which particular organisms live in |
| Community | All the populations of different species are in the same area at the same time |
| Ecosystem | A community and the non living components of an enviroment. Ecosystems can range in size from the very small to the very large |
| Niche | An organisms role within an ecosystem including its position in the food web and habitat. Each species occupies its own niche governed by adaptation to both abiotic and biotic conditions |
| Carrying capacity | The maximum population size an ecosystem can support |
| Abiotic factors | Non living conditions of an ecosystem |
| Biotic factors | Impact of the interactions between organisms |
| What are the factors that affect population size | Abiotic factors and Biotic factors Interspecific competition Intraspecific competition |
| Abiotic factors | These can range from temperature oxygen and carbon dioxide concentration light intensity PH and soil conditions Plants and animals adapt to this through the process of natural selection |
| The less harsh the abiotic factors the larger the range of species and the larger the population sizes | |
| Biotic factors | The living components of an ecosystem interacting together such as interspecific and intraspecific competition and predation also affect population size |
| What is interspecific competition | This is when members of different species are in competition for same resource that is an limited supply. This could be competition for a habitat food or water Individuals better adapted more likley to succeed |
| What is intraspecific competition | When members of the same species are in competition for recources and a mate. Competetion for a mate links to courtship rituals . E.g individuals who are more fitter will have more energy for courtship rituals . |
| Predator and prey relationships | The size of the predator and prey populations both fluctuate There will always be more prey than predators The size of the population will always change in the prey and then the predators |
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yHya