IB Biology SL C4.1.14 Tests for Interspecific Competition Questions

Use nematode and barnacle field data to identify reciprocal population effects, realized-niche displacement and competitive exclusion in IB Biology SL C4.1.14.

Exam points

Identify competition between two species from an experiment or field comparison by linking overlapping resource use to reciprocal population reduction, displacement or competitive exclusion.
Interpret competition data from presence/absence, abundance or removal comparisons to infer which species occupies the realized niche and how competition changes distribution.

[Maximum number: 1]

Caenorhabditis elegans and Caenorhabditis briggsae are two species of nematode that co-exist in rotting plant material. A study was conducted in France to determine the relative population of each species in samples of apples.

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Suggest, with a reason, the type of interaction that may exist between the two nematodes.

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IB Biology SL C4.1.14 Tests for Interspecific Competition Questions question 1