i think what pies said about the seasons is true, its alot like the lighting phases that some of you have ie t5's turn on first and then the halides making it like a sunrise,
in nature of course there are going to be fluxuations (as its not a controlled environment) and if you want to imitate it then you need to consider its variables)
im going to go for a simulated typhoon tommorow and throw coconuts and dead pigs into my tank