BRAINCAKEPopulations and Sustainability
Revision notes for Populations and Sustainability in OCR Biology A (H420). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- Population SizeA population is all the individuals of one species living in the same place at the same time.
- Carrying CapacityThe carrying capacity of an environment is the maximum population size of a species that the environment can support sustainably over a long period…
- Limiting Factors of Population SizeA limiting factor is any factor that limits the growth of a population by restricting the resources or conditions available.
- Density-Dependent and Density-Independent FactorsLimiting factors can be classified by whether their effect depends on how crowded the population is.
- Predator-Prey RelationshipsIn a predator-prey relationship, the population sizes of the predator and the prey are linked, and they often rise and fall in regular cycles.
- Interspecific CompetitionInterspecific competition is competition between individuals of different species for the same limited resources, such as food, water, light, space…
- Intraspecific CompetitionIntraspecific competition is competition between individuals of the same species for the same limited resources, such as food, water, space…
- ConservationConservation is the maintenance of biodiversity through active management of ecosystems, while still allowing humans to use natural resources…
- PreservationPreservation is the protection of an area or ecosystem by keeping it in its present, untouched state, with little or no human interference.
- SustainabilitySustainability means using resources in a way that meets the needs of people today without reducing the ability of future generations to meet their…
- Sustainable Timber Production - CoppicingCoppicing is a traditional method of sustainable timber production.
- Sustainable FishingFish are a renewable resource, but overfishing (catching fish faster than the population can reproduce) has caused many fish stocks to collapse.
- Managing Ecosystems - Masai MaraThe Masai Mara is a large area of savannah grassland in south-west Kenya, next to the Serengeti in Tanzania.
- Managing Ecosystems - Terai RegionThe Terai is a belt of lowland at the foot of the Himalayas, stretching across southern Nepal and northern India.
- Managing Ecosystems - Peat BogsA peat bog is a wetland where the ground is permanently waterlogged.
- Managing Environmentally Sensitive Ecosystems - GalapagosThe Galapagos Islands are volcanic islands in the Pacific Ocean, about 1000 km west of Ecuador.
- Managing Environmentally Sensitive Ecosystems - AntarcticaAntarctica is the coldest, driest and windiest continent.