You mean fungi / bacteria > bacteriophage / virus > herbivorous insects > predatory insects > plants / fungi > microogranisms more generally > plants / fungi > insects > reptile > birds > plants > birds > insects > reptile / birds > herbiverous mammals > insects <> bird eating spiders > birds > plants > predatory mammals > bacteria / fungi <> viruses ...

You're over simplying it because you think the oceans are more complicated or something.