Populations and sustainability Flashcards
Lag phase
Few individuals
Aclimitisation
reproduction rate low
pop. increasing slowly
Log Phase
Resources are plentiful, conditions good
reproduction rate>mortality
pop. increasing rapidly
Stationary phase
pop. levelled out. Habitat can’t support pop.
reproduction rate=mortality rate
Carrying capacity
the max pop. size that can be maintained over a peiod of time in a particular habitat.
LIMITING FACTOR
Density dependent
The effect it has on the pop. depends on the pop. size. Often cause intraspecific competition & important for determinig pop. carrying capacity.
food, light, shelter…
LIMITING FACTOR
Density independent
Factors such as temp.,rainfall and salinity that remain constant regardless of pop. size.
k-strategists
k-strategists and their characteristics
r-strategists
r-strategists and their characteristics
Conservation
The maintenance of biodiversity and maintenance of a variety of habitats and ecosystems.
Preservation
Maintence of habitats and ecosystems in their present condition. Minimising human impact.
3 threats to biodiversity
- Over-exploitation
- Habitat disruption
- New species introduced to the environment that outcompete o.g. species.
6 Management strategies for conservation
- increase carrying capacity
- control predators and poachers
- vaccinate against disease
