Compare top-down and bottom-up influences on population sizes within a community.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2023–2025.
Which situation is an example of top-down population control? A. Grazing snails reduce the abundance of algae B. Rainfall limits the growth of grasses C. Algae supply more food and increase snail abundance D. Phosphate availability limits algal growth
A model stream-channel experiment manipulates the presence of grazing snails and addition of nitrate plus phosphate. After eight weeks, investigators estimate the changes in cell volume of three photosynthetic groups. Other consumers are excluded. (i) Identify…
Predict the likely effects of (i) removing mussels on sea stars, and (ii) removing barnacles on the community.
Explain why the sea star can be regarded as a keystone species.
Predict the likely effects of (i) removing mussels on sea stars, and (ii) removing barnacles on the community.
Explain why the sea star can be regarded as a keystone species.
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