First you need to find the inhabitants of the taiga. 
Taiga animal nutrition circuit should show the links of links in a taiga ecosystem in the form of a food chain, which should begin with the simplest organisms and representatives of the plant world, which are producers of the entire chain and end with third -order consumptions (large carnivorous).
To make a power chain characteristic of the taiga, you need to know which animals live in the taiga and which plants grow. Based on this, for the taiga you can make such power chains:
spruce – bug – woodpecker – hawk
birch – hare – fox
Ivo – Kosulya – Bear
It’s a little strange for me when the tiger is made by the inhabitant of the taiga, because it is well known that there are no tigers in the taiga, and the Far Eastern forests cannot be called a taiga. However, the rest of the power chain for the taiga is compiled correctly. Mineral substances from organic waste get mushrooms, bacteria in soil and worms, these substances receive trees that feed a huge number of insects and small animals. For those, in turn, the insectivorous or predatory birds, predators, which, eventually dying themselves, become organic waste. The chain will then look like this:
Bacteria, mushrooms – cedar, pine – beetle beetle, larva – woodpecker – owl
Bacteria – cedar – protein – marten – wolverine
Bacteria – shrub, grass – moose – bear
Bacteria – berry shrub – mouse – fox – man, hunter.