- Population Density
- During seasons such as the summer and spring the population shoots up to be 100 lemmings for every mi^2. Harsher conditioned seasons tend to drop lemming numbers to be on average 50 lemmings per mi^2.
- Sex and Age Ratio
- 20-30% males (there’s an excess of females) 6% sub adults, 34% older adults
- Carrying Capacity
- Approximately 7 per square mile
- Limiting Factors: Food availability and predator population
- Competition: when two organisms compete for resources, mates, etc
- Competes with other lemmings for a mate
- Mutualism: the biological interaction between two organisms in which both organisms benefit.
- Lemmings and snow geese have a mutualistic relationship because of the cycles of lemming population causes the cycle of lemmings and snow geese being hunted; geese and lemmings both benefit from each other.
- Commensalism: the biological interaction between two organisms in which one organism benefits and the other organism is neither harmed nor helped.
- No commensalistic relationships were found for the lemming
- Parasitism: the biological interaction between two organisms in which one organism benefits and the other organism is harmed.
- Lemmings are hunted and eaten by arctic fox and hence suffer while the fox benefit