Give a broad overview of the adaptations of organisms in estuarine systems.

Estuarine ecosystems, where freshwater from rivers meets and mixes with saltwater from the ocean, create unique environments with fluctuating salinity, temperature, and oxygen levels. Organisms living in estuarine systems face significant challenges due to these dynamic conditions. To survive and thrive in such habitats, these organisms exhibit a variety of adaptations that help them cope with changes in salinity, nutrient availability, and other environmental factors. These adaptations can be categorized into physiological, behavioral, and morphological strategies.

Physiological Adaptations:
One of the key challenges in estuaries is the variation in salinity, as tides bring in saltwater, and freshwater runoff dilutes it. To manage these salinity fluctuations, many estuarine organisms have evolved the ability to regulate their internal salt concentration. This is known __________ _________ _____ _________ _____ __________ _______ ____ _____ _________ _______.
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