- Population Density: Number of Species per square mile
- Over the last century the arctic fox has had a steady decline in population due to competition from the red fox. About 100 dens cover approximately 600 km2, so it is one den for every 2.31 mi^2. This number is highly dependent on the lemming population in the tundra.
- Sex and Age Ratio
- Approximately 1:1, The amount of juveniles (<1 year old) was approximately 8% in a poor reproduction year yet 71-86% in years with a higher productivity
- Carrying Capacity
- The Arctic Fox is endangered
- Approximately 30 dens per square mile, 7 lemmings per square mile
- Limiting Resources
- Prey population (Like lemmings)
- Competition: when two organisms compete for resources, mates, etc.
- Competes with other arctic foxes for a mate along with red foxes for food resources
- Mutualism: the biological interaction between two organisms in which both organisms benefit.
- No mutualistic/symbiotic relationships were found
- Commensalism: the biological interaction between two organisms in which one organism benefits and the other organism is neither harmed nor helped.
- Follows polar bear and feeds on the remains of its kills; polar bear receives no benefit, but the arctic fox benefits
- Follows caribou because caribou loosen the soil and hence make the hunting process easier for the arctic fox
- Parasitism: the biological interaction between two organisms in which one organism benefits and the other organism is harmed.
- Hunts and eats lemming, hence benefiting the fox but not the lemming
- Is eaten by polar bears and other large organisms and hence is a victim of parasitism
- Keystone species: a species in which other species in an ecosystem largely depend on
- The arctic fox is a keystone species because it is consumed by polar bears, wolves, and kittiwakes; a decline in the arctic fox population would greatly alter the lifestyle of these organisms and may inhibit their survival