Practise IB ESS SL 2.1.6 by distinguishing biotic from abiotic factors and explaining how they influence population distribution, size and density in ecosystems.
Figure:Four species of the family Leporidae
Figure:A dichotomous key for species A to D
Figure:Sagebrush ecosystem without invasive cheatgrass
Figure:Sagebrush ecosystem with invasive cheatgrass
The family Leporidae includes hares and rabbits. The figures show four species that can be found in western North America.
The sagebrush ecosystem provides a habitat for pygmy rabbits. Suggest one reason why there might be a greater number of pygmy rabbits in the ecosystem shown in Figure: Sagebrush ecosystem without invasive cheatgrass than in the ecosystem shown in Figure: Sagebrush ecosystem with invasive cheatgrass.