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Researching into the marine environmental and sea protection field, the diversity of approaches to ecology and the excessive splitting between segments being studied has been noted. The recognition of the parts of the separated ecosystems and interactions contained between them are the cause of the diversity in approaches and sometimes they lead to a virtual loss of understanding of their functional wholeness. The aim of this work is to show up the functional ties in the ecosystems exampled by the system of the marine environment and sea pollution and their effective protection. By applying the system theory method, outlining the general nature of interactions in the marine ecosystems, notifying the energy flow dynamics and highlighting the ecological efficiency and nutrient cycling, the necessity of a systematic approach through a functional whole is pointed out. To conclude with, the natural tendency of the ecosystems to reach homeostasis, as well as the problem of a negative ecological inheritance that un-doubtfully put the 'weight' on the whole human population, and the systematically educational approach as a possible direction to sustainable development have been accented. [ABSTRACT FROM AUTHOR]