The food chain in the reservoir.

univerkov | February 6, 2021 | education

with standing water:
Algae (elodea, spiragira) ⇒ small fish (carp, crucian carp, roach, loach) ⇒ predatory fish (pike, ruff) ⇒ bird of prey (heron).
with running water:
Algae ⇒ Daphnia (water flea) ⇒ Dragonfly larva ⇒ Swimming beetle ⇒ Perch ⇒ heron.
Spiraghira-tina.

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