On an island, the caterpillars of one moth species feed on shrub leaves. The adult moths are the main food of a bat species.
Predatory ants were accidentally introduced to the island. The ants catch and eat the moth caterpillars. During the next four years, the bat population decreased.
Explain the decrease in the bat population after the predatory ants were introduced.
Researchers removed the ants from one area. Adult moth numbers then increased, but the population of the first bat species remained low.
A second bat species uses the same tree holes for nesting.
Using the information about the nesting sites, suggest why the population of the first bat species remained low.
Scientists propose establishing the first bat species on a different island where predatory ants are absent.
Suggest one reason why this may not prevent the bat species from disappearing.
82 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.