Some people say that quizbowl needs more engineering content. Answer the following about ecosystem engineers, species responsible for shaping their environments, for 10 points each.
[10e] Ecosystem engineers are considered a subset of these species that have a disproportionate effect on an ecosystem for their population size. The grey wolf is an example of these species in Yellowstone National Park.
ANSWER: keystone species
[10m] Ecosystem engineers have the ability to increase this quantity, the number of distinct species in a community. This component of biodiversity does not account for relative abundance.
ANSWER: species richness
[10h] In the Great Barrier Reef, these keystone species scrape and clean coral. These fish use their distinctive tooth structure to grind down rocky substrates before producing white sand as excrement.
ANSWER: parrotfish
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