5.8 Flashcards
bioaccumulation/biological magnification.
Magnification of non-biodegradable pesticides up the food chain
what are introduced species?
a species that has been released into an ecosystem where they don’t naturally occur.
Biological control
Pest control that exploits naturally existing ecological relationships such as predators, competitors or diseases
Factors that may increase a population
- Increased births
- food resources
- large area of land
Factors that may result in a decreased population
- disease
- death
- migration
Population growth formula
Population growth =births+ immigration - death+ emigration
What do introduced species do
- compete with other animals for food
- provide predators with a new source of prey,
- May become predators
Exponential growth
type of population growth that occurs when there is plenty of food, and lack of predators and disease, eg. bacterium
Carrying capacity
a species’ average population size in a particular habitat
Ecological impact of cane toads
Occupy water habitats so native tadpoles cannot live there
Eating our natural wildlife eg. frogs, fish
Poisonous
Collaboration
When two individuals work together to achieve a common goal, can be symbiotic relationship
eg. mutalism
Inhibition with example
Inhibition is where one organism inhibits the growth of another to eliminate it because it competes for nutrients and space. E.g. fungi inhibiting the growth of bacteria in soil or on rotting food.
Mating with example
Mating is when two organisms reproduce offspring eg. intra specific competition which is a non symbolic relationship
Identify the form of energy that drives photosynthesis
Light energy
emigration vs immigration
people are emigrants when they leave their country of origin, and immigrants when they arrive at their destination,
