I need help with symbiotic relationships in the boreal forest biome.?

Question

I need parasitism.
so far i have...
Mutualism: algae and fungi. fungi help algae in absorbing nutrients. algae help fungi with photosynthesis.

Commensalism: grass seeds attach to the fur of moose to get transported. the grass gets a free ride where as moose gets nothing.

Answer 1

Parasitic flies on the tent caterpillars.
http://www.sciencedaily.com/releases/2002/03/020313074748.htm

Apparently there's something called a brain worm (Parelaphostrongylus tenuis) that infests white-tailed deer and caribou in the boreal forest.
http://www.fsl.orst.edu/wfiwc/proc/2001proc.pdf