In the forest ecosystem tiger sits at the top of the food chain as a tertiary carnivore and primary predator. Along with other major carnivores as leopard it acts as a control mechanism for herbivores or consumers. Thus it controls the population of herbivores and preserves the forest and grassland ecosystem.
The interdependency of living forms in a food chain is obvious as the wild tiger is dependant upon herbivores for its survival where he maintains there population which in turn prevents the grasslands from being overgrazed.
The herbivores depend upon the producers as grasses, herbs, shrubs, algae, fungi and large trees for survival and they in turn maintian a balance in vegetation by controling the extent of vegetation or flora.
Birds survive on herbs, shrubs and trees on fruits and nector and in turn act as seed dispersal agent for them to spread the population of the floral elements in an ecosystem.
Thus all life forms including tiger are interlinked with each other in an ecosystem and their survival depends upon how intact the ecosystem is.