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Date May 2018 Marks available 3 Reference code 18M.3.SL.TZ1.12
Level Standard level Paper Paper 3 Time zone Time zone 1
Command term Analyse Question number 12 Adapted from N/A

Question

Isopods are a group of organisms belonging to the arthropods and include woodlice (slaters) and other species, some of which live on land and others in water. A study was carried out on the diversity of isopod species living in a bog (site B), the edge zone separating the bog and forest (site E) and adjacent forest (site F).

Data collected for the three sites are summarized in the table:

Outline what is meant by the edge effect.

[2]
a.

Analyse the differences in biodiversity seen in the three sites.

[3]
b.

State one method that could be used to estimate the isopod population size.

[1]
c.

Markscheme

a. occurs at the boundary between two ecosystems/habitats 

b. gradient of abiotic conditions at the edge 

c. (as a result) community differs at the edge 

d. community at the edge is more diverse than adjacent communities

a.

a. number of individuals differs more than number of species between the zones 

b. zone E has lowest diversity / zone F has highest diversity 

c. zone B has higher diversity than zone E 

d. edge effect is evident

b.

capture-mark-release-recapture
OR
quadrat / transect

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.4 Conservation of biodiversity
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Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics)
Option C: Ecology and conservation

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