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An aquatic ecosystem is a dynamic and complex system comprising biotic and abiotic components that interact in water-based environments such as lakes, rivers, wetlands, estuaries, and oceans. These ecosystems are crucial to the biosphere as they regulate nutrient cycling, support biodiversity, maintain the hydrological balance, and provide resources and services for human societies. The ecological composition of an aquatic ecosystem includes producers, consumers, decomposers, and abiotic factors, while its dynamics refer to the interactions, energy flows, and ecological processes that shape its structure and function. At the foundation of any aquatic ecosystem lies its abiotic environment. Physical and chemical parameters such as light, temperature, dissolved oxygen, pH, nutrient concentrations, and salinity determine the type of organisms that can survive and thrive. In freshwater ecosystems, factors like flow rate, turbidity, and seasonal variations strongly influence ecological dynamics, whereas in marine systems, tidal cycles, wave action, and ocean currents play significant roles. Light penetration affects the distribution of photosynthetic organisms, as zones such as the euphotic layer in lakes or oceans receive enough sunlight for primary production, while deeper aphotic zones are dominated by organisms that rely on detritus or chemosynthesis. Temperature stratification in lakes, leading to the formation of epilimnion, ___ _________ __________ _______ ______ ______ __________ _______ ________.
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