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an obvious reason is because all organisms are open systems and as such they are constantly in exchange of matter and energy..firt law of thermodinamics. with this stablished you want to have a real idea of how living organisms live out there, their behaviour, why live there and not in another place, why feed of this and not that...endless questions, one needs to understand all the factors that come into play when studying a given ecosystem.
you want to take into account the abiotic factors such as temperature, P 02, humidity...i mean, whatever as well as biotic factors and here come into play the different relationships among individuals, and between populations and communities and ecosystems. these can be mutualistic, competition, parasitism,
and these are the interactions to which you refer. its not enough to have info. separately but you need to put together all the pieces of the puzzle, so to speak.