2.1.30 (HL)—Human impacts on species

Syllabus
First assessment 2026
Objective
2.1.30
Level
HL

Combine Identity, Niche and Life History

HL only

Predict disturbance response by combining which population is affected, what conditions it needs and how quickly its life history can replace losses.

Trace disturbance → niche mismatch or loss → reproduction/survival response → recovery speed. Protecting one habitat feature may miss timing or food interactions.

Warming advances caterpillar emergence before a migratory bird breeds; a late-maturing bird then loses food synchrony and recovers slowly.

No; monitor timing and food interactions as well as space.

A habitat can remain while niche conditions or interactions become unsuitable.