Other sources of variability in home range size include habitat requirements and prey availability.

Their diet varies according to season, locality and prey availability.

They have an exceptional ability to adapt to changes in prey availability, and have a very broad diet.

Mating times for this species are highly dependant upon weather conditions and prey availability.

Weather may impact American marten activity, resting site use, and prey availability.

Dredging can affect migration, population distribution and prey availability.

There are many sources of variation in prey availability affecting the diets of predators.

Nest numbers and average clutch sizes are smaller in periods of reduced prey availability.

The increase in prey availability translates into higher energy intake and reduced energy output.

In these populations, the breeding season is determined by rainfall and consequent prey availability.