Decaying leaves - > Worms - > Crayfish -> Trout - > Herons.
Food chain is defined as the relationship between the prey and hunter which are present in a particular ecosystem and are dependent on one another for food.
Food chain as given here is basically a saprophytic one, which starts with the dead and decaying leaves inside water which are consumed by worms. These worms are consumed by aquatic insects like shrimp and crayfishes. These insects are consumed by smaller fishes like Trouts which are eventually consumed by carnivorous birds like Herons. Thus the food chain is a connection between the land and aquatic ecosystems, and is a saprophytic one.
The complete food chain has been:
Decaying leaves < Worms < Crayfish < Trouts < Herons
Food chain has been given as the dependence of the consumer in an ecosystem on one another for the food.
The food chain has been starting from the producers and followed by the consumers.
The producers have been the organisms that produce their own food. In the given chain, there has been decaying leaves. Thus, this has been a saprophytic food chain.
The primary consumers for decaying leaves have been worms.
Worms have been eaten up by aquatic insects like crayfish as the secondary consumers.
The insects in the aquatic environment are consumed by small fishes like Trouts, followed by carnivores bird like Herons.
Thus, the complete food chain has been:
Decaying leaves < Worms < Crayfish < Trouts < Herons
Learn more about food chain, here:
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