RECAP

2.2 Interactions Among Species-recap

Bottom-Up Population Regulation

• A population can be regulated by limits in the food supply

Predation and Population Size

Top-Down Population

Regulation

Carnivorous plants in bogs are predators because they capture and eat prey

• predator- an organism that kills and consumes other organisms
• prey- an organism that is eaten by the predator

• when a top predator controls the population dynamics of the ecosystem.
• ex: kelp forest ecosystems, sea otters are a keystone predator. They prey on urchins which in turn eat kelp.

Parasite- an organism whose niche is dependent on a close association with a larger host organism

Mutualism - a symbotic relationship between two species in which both species benefit from the relationship

Symbiosis- he interaction between members of two different species that live together in a close association

OCCUPYING ECOLOGICAL NICHES

There are millions of species on the earth, therefore there are million of niches. Each niche has its own unique service.

A bog is a common wetland in Canada that has many niches.

• bog: a type of wetland that the water in it is acidic and low in nutrients.

A bog has lots of water and sunlight, which is needed for plants. While the water and soil are acidic and deprived of nutrients. Bog plants will adapt to occupy niches that are limited to those conditions

RECAP

ECOLOGICAL NICHE

• fit of a species living under specific environmental conditions
• describes how an organism or population responds to the distribution of resources and competitors, and how it in turn alters those same factors

design by Dóri Sirály for Prezi