The fundamental niche is defined as:
“Conditions species would use without competition” for the fundamental niche is defined as. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Niche differentiation reduces overlap by separating species along resource, space, or time axes. Such partitioning can stabilize coexistence when each species performs relatively better under the conditions it uses most strongly. The remaining alternatives—“The actual conditions used by species”, “Only abiotic interactions”, “Only biotic interactions”—refer to
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 13
