Identifying Niche Breadth: Ecologists measure the variety of resources a species uses. A generalist species has a broad niche (survives in many conditions), while a specialist has a narrow niche.
Analyzing Niche Partitioning: This involves observing how similar species divide resources. Common methods include tracking diurnal vs. nocturnal activity or mapping specific feeding heights and locations.
Resource Mapping: By plotting resource use on a graph (e.g., prey size vs. temperature), scientists can visualize the 'niche space' and identify areas of potential competition.
| Feature | Habitat | Niche |
|---|---|---|
| Definition | The physical environment or 'address' where a species lives. | The functional role or 'job' of a species within that environment. |
| Focus | Location and abiotic conditions (climate, terrain). | Biotic interactions and resource utilization. |
| Sharing | Many species can share the same habitat simultaneously. | No two species can share the exact same niche. |
| Example | A tropical rainforest. | A fruit-eating bird active at dawn in the high canopy. |
Define with Precision: Always define 'niche' as a role rather than a place. Using the word 'place' or 'location' as the primary definition is a common way to lose marks.
Explain the Result of Overlap: When discussing competition, clarify that it is specifically interspecific competition for the same niche that leads to exclusion.
Look for Subtle Differences: In exam scenarios where two species seem to share a niche, look for differences in time, diet, or specific location to explain their coexistence.
Connect to Abundance: Remember that successful niche occupation leads to higher abundance (population size), while high niche overlap usually leads to lower abundance for both competitors.
The 'Space' Misconception: Students often think of a niche as a physical space. It is actually a multidimensional summary of all environmental factors a species requires.
Assuming Direct Combat: Competition doesn't always involve physical fighting; it often involves one species being more efficient at gathering food or reproducing, slowly displacing the other.
Overlooking Biotic Factors: Don't forget that a niche includes predators and parasites. A species' role is defined as much by what eats it as by what it eats.
