What is ecological niche?
-the limits for all important environmental variables, within which individuals of a species can survive, grow and reproduce -includes environmental and resource gradients
What is a fundamental niche?
-the largest niche that an organism or species can occupy in the ABSENCE of interactions with other species including disease organisms (essentially unknowable)
What is realised niche?
-the portion of fundamental niche that is occupied by a species in the PRESENCE of interactions with other species (e.g. competitors, predators etc.)
What is the competition exclusion principle?
-complete competitors cannot coexist -the fundamental niches may overlap a lot but the realised won't
Is it possible for niches to overlap in one dimension provided they are separated on at least one other?
How does predation affect the prey species?
-negatively- the fundamental will overlap and realised won't at all
Can the realised niche be bigger than the fundamental niche?
-yes, if there is facilitation where the interaction with other species increases the fitness of a species = positive interaction
How does competition for resources affect niche?
-alter the dimension and affect fitness
Are niches different from the bell curve?
Are niches fixed in time and space?
Are they hard to measure?
Do niches only apply to animals?
-no, all organisms
Describe what's happening:
-the predation has negative effects on the prey species
-fundamental niches overlap but the predation makes the prey species adapt
-the competitive excluison principle
- complete competitors can't coexist so they adapt
-predators have to eat
-so the realised niches overlap
-the right: not likely to happen to this extent
-where species benefits from the presence of another species= postive interaction