| Date | May 2016 | Marks available | 4 | Reference code | 16M.3.SL.TZ0.16 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Explain | Question number | 16 | Adapted from | N/A |
Question
Explain how alien species can affect community structure in an ecosystem.
Markscheme
Species introduced into habitat/ecosystem
Disrupt food chains
Reduce the number of organism that occupy similar niches
They can overconsume prey species
Reduce availability of prey species for other consumers
They can overconsume a native predator
Leading to loss of control on numbers of prey species
Their impact will reduce the biodiversity
Can lead to extinction of some species
May have no natural predators/control
Examiners report
Nearly all candidates gave good explanations on how alien species affect community structure.
Syllabus sections
Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.3 Impacts of humans on ecosystems
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