Why are estuaries often referred to as "nurseries" for marine life?

Estuaries are commonly referred to as "nurseries" for marine life primarily because they provide protected environments for various organisms. The unique characteristics of estuaries—where freshwater from rivers meets and mixes with saltwater from the ocean—create a complex habitat rich in nutrients and diverse habitats, such as mangroves, marshes, and submerged vegetation.

These environments offer shelter from predators, calm waters for young fish and invertebrates, and abundant food sources, enabling juvenile organisms to grow and thrive before moving into the open ocean. This protective aspect is crucial for the early life stages of many species, supporting their survival and contributing to the overall biodiversity of marine ecosystems.

While variations in salinity can occur in estuaries, the protective nature of these ecosystems is paramount to their role as nurseries. Additionally, these areas are not devoid of nutrients; in fact, they are often nutrient-rich, fostering a productive environment that supports a wide array of marine life at different stages of development.