traista ciobanului-Producator
păduchele hematofag-C cuaternar
păduchele fitofag-Cprimar
buburuza-Cprimar
graur -consumator secundar
uliu-consumator tertiar
fitoplancton-producator
scrumbia-consumator secundar
crustacee-consumator secundar
peste rapitor -consumator tertiar
pescărus -consumator cuaternar in raport cu un peste rapitor sau tertiar in raport cu alt peste