Populations and sustainability

Few individuals Aclimitisation reproduction rate low pop. increasing slowly

Resources are plentiful, conditions good reproduction rate>mortality pop. increasing rapidly

pop. levelled out. Habitat can’t support pop. reproduction rate=mortality rate

the max pop. size that can be maintained over a peiod of time in a particular habitat.

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…

Factors such as temp.,rainfall and salinity that remain constant regardless of pop. size.

The maintenance of biodiversity and maintenance of a variety of habitats and ecosystems.

Maintence of habitats and ecosystems in their present condition. Minimising human impact.

• Over-exploitation • Habitat disruption • New species introduced to the environment that outcompete o.g. species.

• increase carrying capacity • control predators and poachers • vaccinate against disease