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Level 19

Competition and environmental change


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Survival
All organisms compete for food and other resources to do this
Plants
These need light, space, water and minerals to survive
Animals
These need space, food, water and mates
Compete
Organisms do this against other species and members of their own species to ensure survival
Squirrels
The grey versions of these are becoming more common due to them winning the competition for food and other resources causing the red version of this's populations to decline
Changes
These happen to an environment all the time and can be caused by living and non-living factors
Living factors
Examples of this are a change in the occurrence of infectious disease, a change in the number of predators, a change in the availability of food/prey, a change in the number or type of competitors
Non-living factors
Examples of this are a change in the average temperature, a change in the average rainfall, a change in the level of air or water pollution
Environmental changes
These can affect a population of animals or plants in three ways
Population size increase
If there is more food more of that species will survive and reproduce so this will happen
Population decrease
If there is an increase in a disease, if there is an increase in competition or if there is a decrease in food supplies this will happen
Bees
The population of these in the UK is decreasing, reasons could be that some pesticides have a negative impact on these animals. There are less nectar-rich plants, there is a new pathogen or parasite.
Population distribution changes
This could be caused by a change in the place an organism lives because of non-living factors
Bee-eater bird
This has change habitat because of the average temperature rise, this Mediterranean species has decided to live in Germany instead