Question

below is a food web from a tundra ecosystem in nunavut, a territory in northern canada.
which of these organisms contain matter that was once part of the lichen? select all that apply.
barren - ground caribou
bilberry
rough - legged hawk
brown lemming
grizzly bear

Explanation:

1. Barren-ground caribou: Directly feeds on lichen, so its matter includes lichen matter.
2. Grizzly bear: Feeds on barren-ground caribou, which eats lichen, so it indirectly obtains matter from lichen.
3. Rough-legged hawk: Does not prey on organisms that eat lichen (its prey is brown lemming, which eats bilberry/bear sedge), so it does not get matter from lichen.
4. Bilberry: A producer that does not consume lichen, so it does not contain lichen matter.
5. Brown lemming: Eats bilberry and bear sedge, not lichen, so it does not contain lichen matter.

Answer:

• barren-ground caribou
• grizzly bear