IB ESS HL 2.5.11 Hl R and K Strategist Species Topic Practice

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Study 2.5.11 (HL)—r- and K-strategist species conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]
Mottled sculpin

FigureA:Round goby

Mottled sculpin

FigureB:Mottled sculpin

Figure:Fact file on the round goby

- Figure: Mottled sculpin: Fact file on the round goby
- Round goby is invasive, first discovered in the St Lawrence River in 1990.
- Females lay eggs three times a year, up to 5000 eggs each time, and young fish mature quickly.
- Round goby can eat up to 4000 eggs of other fish in 15 minutes, defend egg-laying sites, out-compete mottled sculpin, eat zebra mussels, and are eaten by native fish.

Using Figures: Mottled sculpin and Pictures of the round goby and mottled sculpin, identify one feature of the round goby that shows it is an r-selected species.

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